Amentotaxus

Superregnum: Eukaryota
Regnum: Plantae
Divisio: Tracheophyta
Divisio: Pinophyta
Classis: Pinopsida
Ordo: Pinales

Familia: Taxaceae
Genus: Amentotaxus
Species: A. argotaenia - A. assamica - A. formosana - A. hatuyenensis – A. hekouensis – A. poilanei - A. yunnanensis

Name

Amentotaxus Pilg., Bot. Jahrb. Syst. 54: 41 (1916)

Type species: Amentotaxus argotaenia (Hance) Pilg., Bot. Jahrb. Syst. 54: 41 (1916)

References

Pilger, R.K.F. 1916. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 54(1): 41.
Govaerts, R. et al. 2017. Amentotaxus in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2017 Feb. 15. Reference page.
International Plant Names Index. Feb.. Amentotaxus. Published online. Accessed: 15 Feb..
Tropicos.org 2017. Amentotaxus. Missouri Botanical Garden. Published online. Accessed: 15 Feb. 2017.

Amentotaxus is a genus of conifers (catkin-yews) comprising five species, treated in either the Cephalotaxaceae, or in the Taxaceae when that family is considered in a broad sense. The genus is endemic to subtropical Southeast Asia, from Taiwan west across southern China to Assam in the eastern Himalaya, and south to Vietnam. The species are evergreen shrubs and small trees reaching 2–15 m tall.

The leaves are spirally arranged on the shoots, but twisted at the base to lie in two flat ranks (except on erect leading shoots); they are linear-lanceolate, 4–12 cm long and 6–10 mm broad, soft in texture, with a blunt tip, green above, and with two conspicuous white stomatal bands below. They differ from the related genus Cephalotaxus in the broader leaves, and from Torreya by the blunt, not spine-tipped leaves.

The species can be either monoecious or dioecious; when monoecious, the male and female cones are often on different branches. The male (pollen) cones are catkin-like, 3–15 cm long, grouped in clusters of two to six together produced from a single bud. The female (seed) cones are single or grouped a few together on short stems; minute at first, they mature in about 18 months to a drupe-like structure with the single large nut-like seed 1.5–3 cm long surrounded by a fleshy covering, orange to red at full maturity; the apex of the seed usually protrudes slightly out of the fleshy covering.

The oldest fossils that are recognisable to the genus are from the Middle-Late Jurassic Daohugou Bed of China.[1]
Extant species
Image Scientific name Common name Distribution
Amentotaxus argotaenia 2.JPG Amentotaxus argotaenia Catkin yew China: Fujian, southern Gansu, Guangdong, Guangxi, Guizhou, western Hubei, Hunan, Jiangsu, north-western Jiangxi, central and south-eastern Sichuan, south-eastern Tibet and southern Zhejiang
Amentotaxus assamica Assam catkin yew India
Amentotaxus formosana underside.jpg Amentotaxus formosana Taiwan catkin yew Taiwan
Amentotaxus hatuyenensis Vietnam
Amentotaxus poilanei Poilane's catkin yew Vietnam
Amentotaxus yunnanensis - Lyman Plant House, Smith College - DSC04389.JPG Amentotaxus yunnanensis Yunnan catkin yew Laos, Vietnam, and Guizhou and Yunnan in China
References

Dong, Chong; Shi, Gongle; Herrera, Fabiany; Wang, Yongdong; Herendeen, Patrick S; Crane, Peter R (2020-06-18). "Middle–Late Jurassic fossils from northeastern China reveal morphological stasis in the catkin-yew". National Science Review. 7 (11): 1765–1767. doi:10.1093/nsr/nwaa138. ISSN 2095-5138.