Trillium

Life-forms

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Monocots
Ordo: Liliales

Familia: Melanthiaceae
Tribus: Parideae

Genus: Trillium
Subgenera: T. subg. Phyllantherum – T. subg. Trillium
Species: T. albidum - T. angustipetalum - T. apetalon - T. camtschatcense - T. catesbaei - T. cernuum - T. chloropetalum - T. cuneatum - T. decipiens - T. decumbens - T. discolor - T. erectum - T. flexipes - T. foetidissimum - T. gracile - T. grandiflorum - T. hagae - T. kamtschaticum – T. kurabayashii - T. lancifolium - T. ludovicianum - T. luteum - T. maculatum - T. nivale - T. ovatum - T. parviflorum - T. persistens - T. petiolatum - T. pusillum - T. recurvatum - T. reliquum - T. rivale - T. rugelii - T. sessile - T. simile - T. smallii - T. stamineum - T. sulcatum - T. texanum – T. tschonoskii - T. underwoodii - T. undulatum - T. vaseyi - T. viride - T. viridescens

Name

Trillium L.
References

USDA, ARS, Germplasm Resources Information Network. Trillium in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 08-Apr-12.

Vernacular names
Deutsch: Waldlilien
English: wake-robin, birthroot
Esperanto: Trilio
suomi: Kolmilehdet
русский: Триллиум

Trillium (trillium, wakerobin, tri flower, birthroot, birthwort, and sometimes "wood lily") is a genus of about fifty flowering plant species in the family Melanthiaceae. Trillium species are native to temperate regions of North America and Asia,[3][4] with the greatest diversity of species found in the southern Appalachian Mountains in the southeastern United States.[5][6]

Description

Plants of this genus are perennial herbs growing from rhizomes. There are three large leaf-like bracts arranged in a whorl about a scape that rises directly from the rhizome. There are no true aboveground leaves but sometimes there are scale-like leaves on the underground rhizome. The bracts are photosynthetic and are sometimes called leaves. The inflorescence is a single flower with three green or reddish sepals and three petals in shades of red, purple, pink, white, yellow, or green. At the center of the flower there are six stamens and three stigmas borne on a very short style, if any. The fruit is fleshy and capsule-like or berrylike. The seeds have large, oily elaiosomes.[3][4]

Occasionally individuals have four-fold symmetry, with four bracts (leaves), four sepals, and four petals in the blossom.[7][better source needed]
Taxonomy

In 1753, Swedish botanist Carl Linnaeus established the genus Trillium by recognizing three species, T. cernuum, T. erectum, and T. sessile.[8] The type specimen T. cernuum described by Linnaeus was actually T. catesbaei,[9] an oversight that subsequently led to much confusion regarding the type species of this genus.

Initially the Trillium genus was placed in the family Liliaceae. In the nineteenth and early twentieth centuries it was sometimes placed in a smaller family, Trilliaceae.[10] By 1981 Liliaceae had grown to about 280 genera and 4,000 species.[11] As it became clearer that the very large version of Liliaceae was polyphyletic, some botanists preferred to place Trillium and related genera into that separate family. Others defined a larger family, Melanthiaceae, for a similar purpose, but included several other genera not historically recognized as close relatives of Trillium. This latter approach was followed in 1998 by the Angiosperm Phylogeny Group, which assigned the genus Trillium, along with its closest relatives, Paris and Pseudotrillium, to the family Melanthiaceae.[12] However, other taxonomists have since preferred to break up the heterogenous Melanthiaceae into several smaller monophyletic families, each with more coherent morphological features, returning Trillium to a resurrected Trilliaceae.[13][10]

The Trillium genus has traditionally been divided into two subgenera, T. subg. Trillium and T. subg. Sessilium, based on whether the flowers are pedicellate or sessile with respect to their attachment to the apex of the scape. The former is considered the more primitive group.[14][15][3] Until recently the sessile-flowered subgenus was known by the name Phyllantherum, but the name Sessilium has precedence and should be used instead.[16] T. subg. Sessilium has been shown to be a monophyletic group by molecular systematics but its segregation renders the remaining T. subg. Trillium paraphyletic.[17]

All names used in this section are taken from the International Plant Names Index.[18] Unless otherwise noted, the name has been accepted by World Checklist of Selected Plant Families.[19] The geographical locations are taken from the Flora of North America[3] except where noted.
North American taxa

The following species belong to T. subg. Trillium, that is, they bear pedicellate flowers (on a short stalk) but lack mottled leaves.[20]

Trillium catesbaei Elliott – Alabama, Georgia, North Carolina, South Carolina, Tennessee
Trillium cernuum L. – Manitoba, New Brunswick, Newfoundland, Nova Scotia, Ontario, Prince Edward Island, Quebec, Saskatchewan; Connecticut, Delaware, District of Columbia, Illinois, Indiana, Iowa, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York, North Dakota, Ohio, Pennsylvania, Rhode Island, South Dakota, Vermont, Virginia, West Virginia, Wisconsin; Saint Pierre and Miquelon
Trillium erectum L. – New Brunswick, Nova Scotia, Ontario, Quebec; Connecticut, Delaware, Georgia, Illinois, Indiana, Kentucky, Maine, Maryland, Massachusetts, Michigan, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Vermont, Virginia, West Virginia
Trillium flexipes Raf. – Ontario; Alabama, Arkansas,[6] Delaware, Illinois, Indiana, Iowa, Kentucky, Maryland,[6] Michigan, Minnesota, Missouri, New York, Ohio, Pennsylvania, South Dakota, Tennessee, Virginia, West Virginia, Wisconsin
Trillium grandiflorum (Michx.) Salisb. – Nova Scotia, Ontario, Quebec; Alabama, Connecticut, Delaware, Georgia, Illinois, Indiana, Iowa, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Vermont, Virginia, West Virginia, Wisconsin
Trillium nivale Riddell – Illinois, Indiana, Iowa, Kentucky, Maryland, Michigan, Minnesota, Missouri, Nebraska, Ohio, Pennsylvania, South Dakota, West Virginia, Wisconsin
Trillium ovatum Pursh – Alberta, British Columbia; California, Colorado, Idaho, Montana, Oregon, Washington, Wyoming
Trillium persistens W.H.Duncan – Georgia, South Carolina
Trillium pusillum Michx. – Alabama, Arkansas, Georgia,[6] Kentucky, Louisiana, Maryland, Mississippi, Missouri, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia
Trillium rugelii Rendle – Alabama, Georgia, North Carolina, South Carolina, Tennessee
Trillium simile Gleason – Georgia, North Carolina, Tennessee
Trillium sulcatum T.S.Patrick – Alabama, Georgia, Kentucky, North Carolina, Tennessee, Virginia, West Virginia
Trillium texanum Buckley[21] – Louisiana, Texas
Trillium undulatum Willd. – New Brunswick, Nova Scotia, Ontario, Prince Edward Island, Quebec; Connecticut, Georgia, Kentucky, Maine, Maryland, Massachusetts, Michigan, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Vermont, Virginia, West Virginia
Trillium vaseyi Harb. – Alabama, Georgia, North Carolina, South Carolina, Tennessee

The following species belong to T. subg. Sessilium, that is, they bear sessile flowers (with no stalk) and have mottled leaves.[22]

Trillium albidum J.D.Freeman – California, Oregon, Washington
Trillium angustipetalum (Torr.) J.D.Freeman – California
Trillium chloropetalum (Torr.) Howell – California
Trillium cuneatum Raf. – Alabama, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, Tennessee
Trillium decipiens J.D.Freeman – Alabama, Florida, Georgia
Trillium decumbens Harb. – Alabama, Georgia, Tennessee
Trillium discolor Hook. – Georgia, North Carolina, South Carolina
Trillium foetidissimum J.D.Freeman – Louisiana, Mississippi
Trillium gracile J.D.Freeman – Louisiana, Texas
Trillium kurabayashii J.D.Freeman – California, Oregon
Trillium lancifolium Raf. – Alabama, Florida, Georgia, South Carolina, Tennessee
Trillium ludovicianum Harb. – Louisiana, Mississippi, Texas
Trillium luteum (Muhl.) Harb. – Georgia, Kentucky, North Carolina, Tennessee
Trillium maculatum Raf. – Alabama, Florida, Georgia, South Carolina
Trillium oostingii Gaddy – South Carolina[6]
Trillium petiolatum Pursh – Idaho, Oregon, Washington
Trillium recurvatum L.C.Beck – Alabama, Arkansas, Illinois, Indiana, Iowa, Kentucky, Louisiana, Michigan, Mississippi, Missouri, Ohio, Tennessee, Texas, Wisconsin
Trillium reliquum J.D.Freeman – Georgia, South Carolina
Trillium sessile L. – Alabama, Arkansas, Illinois, Indiana, Kansas, Kentucky, Maryland, Michigan, Missouri, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, West Virginia
Trillium stamineum Harb. – Alabama, Mississippi, Tennessee
Trillium tennesseense E. E. Schill & Floden[23] – Tennessee
Trillium underwoodii Small – Alabama, Florida, Georgia
Trillium viride L.C.Beck – Illinois, Missouri
Trillium viridescens Nutt. – Arkansas, Kansas, Missouri, Oklahoma, Texas

Asian taxa

All of the following species belong to T. subg. Trillium, that is, they bear pedicellate flowers.[17]

Trillium apetalon Makino[24][25][26] – Japan, Kuril Islands, E Russia (Sakhalin)
Trillium camschatcense Ker Gawl.[27][28] – NE China (Jilin), Japan, Korea, Kuril Islands, E Russia (Primorsky Krai, Khabarovsk Krai, Kamchatka Peninsula, Sakhalin)
Trillium channellii Fukuda, J.D.Freeman & Itou[29][30] – Japan (E Hokkaido)
Trillium govanianum Wall. ex D.Don[31][32][33] – NE Afghanistan, Bhutan, China (Tibet Autonomous Region, Yunnan), N + NE India (Himachal Pradesh, Jammu and Kashmir, Sikkim, Uttarakhand), Nepal, N Pakistan
Trillium × hagae Miyabe & Tatew.[34] – Japan, E Russia (S Sakhalin)
Trillium × komarovii H.Nakai & Koji Ito[35] – Japan, E Russia (Primorsky Krai)
Trillium × miyabeanum Tatew. ex J.Samej.[36] – Japan
Trillium smallii Maxim.[37] – Japan, E Russia (S Sakhalin)
Trillium taiwanense S.S.Ying[38][39] – E Taiwan
Trillium tschonoskii Maxim.[40][41] – Bhutan, China (Anhui, Fujian, Gansu, Hubei, Shaanxi, Sichuan, Tibet Autonomous Region, Yunnan, Zhejiang), NE India (Sikkim), Japan, Korea, Kuril Islands, Myanmar, Russia (Sakhalin), Taiwan
Trillium × yezoense Tatew. ex J.Samej.[42] – Japan

Other taxa

Trillium delicatum, otherwise considered to be a subpopulation of T. decumbens, is a recently described species confined to central Georgia.[43]
Trillium hibbersonii, otherwise known as a dwarf form of T. ovatum, is a recently described species endemic to a small region of Vancouver Island.[44]
Trillium parviflorum V.G.Soukup is an accepted name by some authorities[45][46] while others regard this name as a synonym of T. albidum subsp. parviflorum (V.G.Soukup) K.L.Chambers & S.C.Meyers.[47][48]
Trillium rivale S.Watson[49] has been segregated to a monotypic genus as Pseudotrillium rivale (S.Watson) S.B.Farmer.[50]
Trillium × crockerianum Halda is an accepted name for a hybrid whose parents are T. ovatum and T. rivale.[51] Since the latter is now a member of a different genus (Pseudotrillium), T. × crockerianum is an intergeneric hybrid whose viability is in doubt.[original research?]

Distribution

Trillium species are native to North America and Asia.[3][4][52]
North America

More than three dozen Trillium species are found in North America,[3] most of which are native to eastern North America. Just six species are native to western North America: T. albidum, T. angustipetalum, T. chloropetalum, T. kurabayashii, T. ovatum, and T. petiolatum. Of these, only T. ovatum is pedicellate-flowered.
Canada

Trillium species are found across Canada, from Newfoundland to southern British Columbia. The greatest diversity of species are found in Ontario, Quebec, and Nova Scotia.[3]

Alberta: T. ovatum
British Columbia: T. ovatum
Manitoba: T. cernuum
New Brunswick: T. cernuum, T. erectum, T. undulatum
Newfoundland: T. cernuum
Northwest Territories: none
Nova Scotia: T. cernuum, T. erectum, T. grandiflorum, T. undulatum
Nunavut: none
Ontario: T. cernuum, T. erectum, T. flexipes, T. grandiflorum, T. undulatum
Prince Edward Island: T. cernuum, T. undulatum
Quebec: T. cernuum, T. erectum, T. grandiflorum, T. undulatum
Saskatchewan: T. cernuum
Yukon: none

United States

Except for the desert regions of the southwestern United States, Trillium species are found throughout the contiguous U.S. states. In the western United States, species are found from Washington to central California, east to the Rocky Mountains. In the eastern United States, species range from Maine to northern Florida, west to the Mississippi River valley. Trillium species are especially diverse in the southeastern United States, in Georgia, Tennessee, Alabama, North Carolina, and South Carolina.[3] The state of Georgia is home to nineteen species of trillium.

Alabama: T. catesbaei, T. cuneatum, T. decipiens, T. decumbens, T. flexipes, T. grandiflorum, T. lancifolium, T. maculatum, T. pusillum, T. recurvatum, T. rugelii, T. sessile, T. stamineum, T. sulcatum, T. underwoodii, T. vaseyi
Alaska: none
Arizona: none
Arkansas: T. flexipes, T. pusillum, T. recurvatum, T. sessile, T. viridescens
California: T. albidum, T. angustipetalum, T. chloropetalum, T. × crockerianum, T. kurabayashii, T. ovatum
Colorado: T. ovatum
Connecticut: T. cernuum, T. erectum, T. grandiflorum, T. undulatum
Delaware: T. cernuum, T. erectum, T. flexipes, T. grandiflorum
District of Columbia: T. cernuum
Florida: T. decipiens, T. lancifolium, T. maculatum, T. underwoodii
Georgia: T. catesbaei, T. cuneatum, T. decipiens, T. decumbens, T. discolor, T. erectum, T. grandiflorum, T. lancifolium, T. luteum, T. maculatum, T. persistens, T. pusillum, T. reliquum, T. rugelii, T. simile, T. sulcatum, T. underwoodii, T. undulatum, T. vaseyi
Hawaii: none
Idaho: T. ovatum, T. petiolatum
Illinois: T. cernuum, T. erectum, T. flexipes, T. grandiflorum, T. nivale, T. recurvatum, T. sessile, T. viride
Indiana: T. cernuum, T. erectum, T. flexipes, T. grandiflorum, T. nivale, T. recurvatum, T. sessile
Iowa: T. cernuum, T. flexipes, T. grandiflorum, T. nivale, T. recurvatum
Kansas: T. sessile, T. viridescens
Kentucky: T. cuneatum, T. erectum, T. flexipes, T. grandiflorum, T. luteum, T. nivale, T. pusillum, T. recurvatum, T. sessile, T. sulcatum, T. undulatum
Louisiana: T. foetidissimum, T. gracile, T. ludovicianum, T. pusillum (syn: T. texanum), T. recurvatum
Maine: T. cernuum, T. erectum, T. grandiflorum, T. undulatum
Maryland: T. cernuum, T. erectum, T. flexipes, T. grandiflorum, T. nivale, T. pusillum, T. sessile, T. undulatum
Massachusetts: T. cernuum, T. erectum, T. grandiflorum, T. undulatum
Michigan: T. cernuum, T. erectum, T. flexipes, T. grandiflorum, T. nivale, T. recurvatum, T. sessile, T. undulatum
Minnesota: T. cernuum, T. flexipes, T. grandiflorum, T. nivale
Mississippi: T. cuneatum, T. foetidissimum, T. ludovicianum, T. pusillum, T. recurvatum, T. stamineum
Missouri: T. flexipes, T. nivale, T. pusillum, T. recurvatum, T. sessile, T. viride, T. viridescens
Montana: T. ovatum
Nebraska: T. nivale
Nevada: none
New Hampshire: T. cernuum, T. erectum, T. grandiflorum, T. undulatum
New Jersey: T. cernuum, T. erectum, T. grandiflorum, T. undulatum
New Mexico: none
New York: T. cernuum, T. erectum, T. flexipes, T. grandiflorum, T. sessile, T. undulatum
North Carolina: T. catesbaei, T. cuneatum, T. discolor, T. erectum, T. grandiflorum, T. luteum, T. pusillum, T. rugelii, T. sessile, T. simile, T. sulcatum, T. undulatum, T. vaseyi
North Dakota: T. cernuum
Ohio: T. cernuum, T. erectum, T. flexipes, T. grandiflorum, T. nivale, T. recurvatum, T. sessile, T. undulatum
Oklahoma: T. pusillum, T. sessile, T. viridescens
Oregon: T. albidum, T. kurabayashii, T. ovatum, T. petiolatum
Pennsylvania: T. cernuum, T. erectum, T. flexipes, T. grandiflorum, T. nivale, T. sessile, T. undulatum
Rhode Island: T. cernuum, T. erectum, T. undulatum
South Carolina: T. catesbaei, T. cuneatum, T. discolor, T. erectum, T. grandiflorum, T. lancifolium, T. maculatum, T. persistens, T. pusillum, T. reliquum, T. rugelii, T. undulatum, T. vaseyi
South Dakota: T. cernuum, T. flexipes, T. nivale
Tennessee: T. catesbaei, T. cuneatum, T. decumbens, T. erectum, T. flexipes, T. grandiflorum, T. lancifolium, T. luteum, T. pusillum, T. recurvatum, T. rugelii, T. sessile, T. simile, T. stamineum, T. sulcatum, T. tennesseense, T. undulatum, T. vaseyi
Texas: T. gracile, T. ludovicianum, T. pusillum (syn: T. texanum), T. recurvatum, T. viridescens
Utah: none
Vermont: T. cernuum, T. erectum, T. grandiflorum, T. undulatum
Virginia: T. cernuum, T. erectum, T. flexipes, T. grandiflorum, T. pusillum, T. sessile, T. sulcatum, T. undulatum
Washington: T. albidum, T. ovatum, T. petiolatum
West Virginia: T. cernuum, T. erectum, T. flexipes, T. grandiflorum, T. nivale, T. pusillum, T. sessile, T. sulcatum, T. undulatum
Wisconsin: T. cernuum, T. flexipes, T. grandiflorum, T. nivale, T. recurvatum
Wyoming: T. ovatum

Other

Saint Pierre and Miquelon: T. cernuum

Asia

In Asia, the range of Trillium species extends from the Himalayas across China, Korea, Japan, and eastern Russia to the Kuril Islands. The greatest diversity of Trillium species is found on the islands of Japan and Sakhalin.

Afghanistan: T. govanianum
Bhutan: T. govanianum, T. tschonoskii
China:[4] T. camschatcense (Jilin), T. govanianum (Tibet Autonomous Region, Yunnan), T. taiwanense (E Taiwan), T. tschonoskii (Anhui, Fujian, Gansu, Hubei, Shaanxi, Sichuan, Tibet Autonomous Region, Yunnan, Zhejiang)
India: T. govanianum (Himachal Pradesh, Jammu and Kashmir, Sikkim, Uttarakhand), T. tschonoskii (Sikkim)
Japan: T. apetalon, T. camschatcense, T. channellii (Hokkaido), T. × hagae, T. × komarovii, T. × miyabeanum, T. smallii, T. tschonoskii, T. × yezoense
Korea: T. camschatcense, T. tschonoskii
Kuril Islands: T. apetalon, T. camschatcense, T. tschonoskii
Myanmar: T. tschonoskii
Nepal: T. govanianum
Pakistan:[33] T. govanianum
Russia: T. apetalon (Sakhalin), T. camschatcense (Primorsky Krai, Khabarovsk Krai, Kamchatka Peninsula, Sakhalin), T. × hagae (Sakhalin), T. × komarovii (Primorsky Krai), T. smallii (Sakhalin), T. tschonoskii (Sakhalin)
Taiwan: T. taiwanense, T. tschonoskii

Identification

A fully general dichotomous key requires a mature, flowering plant.[3][53][54][55] The first step is to determine whether or not the flower sits on a pedicel, which determines the subgenus. (Any mature plant may be identified to this extent, even if it is not in bloom.) Identification proceeds based on flower parts, leaves, and other characteristics. A combination of characteristics is usually required to identify the plant.

Identification of a non-flowering, non-fruiting plant with bare leaves may be difficult. Although some species of Trillium have petioles (leaf stalks) and/or distinctive leaf shapes, these features are seldom sufficient to identify the plant down to the species level.

In eastern North America, jack-in-the-pulpit (Arisaema triphyllum) is often mistaken for bare-leaved Trillium. Both species are about the same height with trifoliate leaves but the former lacks 3-way rotational symmetry and has leaf veins unlike those of Trillium.
Ecology

Trilliums are myrmecochorous, with ants as agents of seed dispersal. Ants are attracted to the elaiosomes on the seeds and collect them and transport them away from the parent plant. The seeds of Trillium camschatcense and T. tschonoskii, for example, are collected by the ants Aphaenogaster smythiesi and Myrmica ruginodis. Sometimes beetles interfere with the dispersal process by eating the elaiosomes off the seeds, making them less attractive to ants.[56] Vespicochory, seed dispersal by Vespula species (yellow jacket hornets), has also been observed for trilliums. The insects carry off the seeds and feed on the elaiosomes.[57]
Conservation
Trillium grandiflorum (great white trillium)

Picking parts off a trillium plant can kill it even if the rhizome is left undisturbed.[58] Some species of trillium are listed as threatened or endangered and collecting these species may be illegal. Laws in some jurisdictions may restrict the commercial exploitation of trilliums and prohibit collection without the landowner's permission. In the US states of Michigan[58] and Minnesota[59] it is illegal to pick trilliums. In New York it is illegal to pick the red trillium.[60]

In 2009, a Private Members Bill was proposed in the Ontario legislature that would have made it illegal to in any way injure the common Trillium grandiflorum (white trillium) in the province (with some exceptions), however the bill was never passed.[61] The rare Trillium flexipes (drooping trillium) is also protected by law in Ontario, because of its decreasing Canadian population.[62]

High white-tailed deer population density has been shown to decrease or eliminate trillium in an area, particularly white trillium.[63]

Some species are harvested from the wild to an unsustainable degree. This is particularly dire in the case of T. govanianum, whose high selling price as a folk medicine has motivated harvesters to destroy swathes of ecologically sensitive Himalayan forests, causing mudslides.[64]
Medicinal uses

Several species contain sapogenins. They have been used traditionally as uterine stimulants, the inspiration for the common name birthwort. In a 1918 publication, Joseph E. Meyer called it "beth root", probably a corruption of "birthroot". He claimed that an astringent tonic derived from the root was useful in controlling bleeding and diarrhea.[65]
Culture

The white trillium (Trillium grandiflorum) serves as the official flower and emblem of the Canadian province of Ontario. It is an official symbol of the Government of Ontario. The large white trillium is the official wildflower of Ohio.[66] In light of their shared connection to the flower, the Major League Soccer teams in Toronto and Columbus compete with each other for the Trillium Cup.

Citizen scientists regularly report observations of Trillium species from around the world. T. grandiflorum, T. erectum, and T. ovatum (in that order) are the most often observed Trillium species.[67]

Trillium is the literary magazine of Ramapo College of New Jersey, which features poetry, fiction, photography, and other visual arts created by Ramapo students.[68]

In Mexican LGBT culture, the trillium is included as a symbol on their version of the bisexual pride flag.[69][irrelevant citation]
Gallery

Nodding trillium (Trillium cernuum)

Idaho trillium (Trillium petiolatum)

White trillium (Trillium grandiflorum)

Red trillium (Trillium erectum)

Pacific trillium (Trillium ovatum)

Prairie trillium (Trillium recurvatum)

Relict trillium (Trillium reliquum) an endangered species

Painted trillium (Trillium undulatum)

Bibliography

Barksdale, Lane (1938). "The pedicellate species of Trillium found in the southern Appalachians". Journal of the Elisha Mitchell Scientific Society. 54 (2): 271–296. JSTOR 24332541.
Case, Frederick W.; Case, Roberta B. (1997). Trilliums. Portland, Oregon: Timber Press. ISBN 978-0-88192-374-2.
Freeman, J. D. (1975). "Revision of Trillium subgenus Phyllantherum (Liliaceae)". Brittonia. 27 (1): 1–62. doi:10.2307/2805646. JSTOR 2805646. S2CID 20824379.

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