Layia

Life-forms

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Campanulids
Ordo: Asterales

Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Madieae
Subtribus: Madiinae
Genus: Layia
Species: L. carnosa – L. chrysanthemoides – L. discoidea – L. fremontii – L. galardioides – L. glandulosa – L. heterotricha – L. hieracioides – L. jonesii – L. leucopappa – L. munzii – L. pentachaeta – L. platyglossa – L. septentrionalis
Name

Layia Hook. & Arn. ex DC., Prodr. [A. P. de Candolle] 7(1): 294. (1838) nom. cons.

Type species: Layia galardioides (Hook. & Arn.) DC., Prodr. [A. P. de Candolle] 7(1): 294 (sphalm. gaillardioides). (1838) as Tridax ? galardioides

Synonyms

Homotypic
Urostylis Meisn., Pl. Vasc. Gen. [Meisner] 207; Comm. 133 (1839)

Note: IPNI has made a correction regarding the epithet spelling of the type species that has not been picked up by secondary sources.
Homonyms

Layia Hook. & Arn., Bot. Beechey Voy. 148, in nota. (1833); 357. (1839) nom. rej. vide Ormosia Jacks., Trans. Linn. Soc. London 10: 360. (1811) (Fabaceae)

References

Hooker, W.J. & Arnott, G.A.W. 1838. Prodromus Systematis Naturalis Regni Vegetabilis 7(1): 294.
Hassler, M. 2018. Layia. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published online. Accessed: 2018 Feb. 22. Reference page.
International Plant Names Index. 2018. Layia. Published online. Accessed: Feb. 22 2018.
The Plant List 2013. Layia in The Plant List Version 1.1. Published online. Accessed: 2018 Feb. 22.
Tropicos.org 2018. Layia. Missouri Botanical Garden. Published online. Accessed: 22 Feb. 2018.

Vernacular names
suomi: Tipsut

Layia is a genus of flowering plants in the family Asteraceae known generally as tidy tips, native to western North America. Several are California endemics.[4][5]

These are erect daisylike annual herbs with dark glandular stems. The flower heads usually contain white or yellow ray florets; some species have yellow florets tipped sharply in white which give the flowers their common name. The genus is named for naturalist George Tradescant Lay, who was one of the discoverers of Layia gaillardioides.[6]

Species[3][7]

Layia calliglossa - CA
Layia carnosa - beach tidytips - CA
Layia chrysanthemoides - smooth tidytips - CA
Layia discoidea - rayless tidytips - CA
Layia douglasii - OR WA
Layia elegans - CA
Layia erubescens - CA[8]
Layia fremontii - Frémont's tidytips - CA
Layia gaillardioides - woodland tidytips - CA
Layia glandulosa - white daisy tidytips - CA AZ NM NV UT ID OR WA, Baja California[9]
Layia heterotricha - pale yellow tidytips - CA
Layia hieracioides - tall tidytips - CA
Layia hispida - CA
Layia jonesii - Jones' tidytips - CA
Layia leucopappa - Comanche Point tidytips - CA
Layia munzii - Munz' tidytips - CA
Layia nemorosa - CA
Layia pentachaeta - Sierra tidytips - CA
Layia platyglossa - common tidytips - CA AZ UT
Layia septentrionalis - Colusa tidytips - CA

References

Tropicos search for Layia
The Plant List, Ormosia emarginata (Hook. & Arn.) Benth.
Flann, C (ed) 2009+ Global Compositae Checklist
Candolle, Augustin Pyramus de. 1838. Prodromus Systematis Naturalis Regni Vegetabilis 7(1): 294 in Latin
Tropicos, Layia Hook. & Arn. ex DC.
Flora of North America Vol. 21 Page 262 Layia Hooker & Arnott ex de Candolle in A. P. de Candolle and A. L. P. P. de Candolle
Biota of North America Program 2013 county distribution maps
Baldwin, B. G. A new species of Layia (Compositae) from the Central Coast of California. Madroño 69(1), 88-94. 21 April 2022.
Wildflowers of the Southwestern Deserts