Cycas bifida

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Cycas bifida
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnospermae
Division: Cycadophyta
Class: Cycadopsida
Order: Cycadales
Family: Cycadaceae
Genus: Cycas
Species:
C. bifida
Binomial name
Cycas bifida
(Dyer) K.D.Hill

Cycas bifida (syn. Cycas rumphii var. bifida) is a species of

Tuyên Quang
provinces).

The stems are largely subterranean, 20–60 cm in diameter and up to 20 cm above ground level, and bear three to eight leaves. The leaves are 2–4 m long and 40–80 cm broad, dark green and glossy,

bipinnate, with 27-44 pairs of leaflets, each leaflet dichotomously divided (split in two), linear, 10–38 cm long and 1.5–3 cm broad, papery to leathery in texture; the leaf petiole
is 0.5–2 m long, armed with spikes.

The female

sclerotesta
. The male cones are solitary and erect, spindle shaped and cylindrical 15-23 long and 4–6 cm broad, with light yellow tomentose down and an erect apical spine with 1.2–2 cm sporophylls with 1-3 minute teeth per side.

The species is named after its dichotomously divided leaflets, a character shared with a few other related species. It has been extensively confused in literature with the related species Cycas multifrondis and Cycas micholitzii (K. D. Hill, Cycad Pages); in the Flora of China, it is treated as Cycas micholitzii, a species restricted by Hill to plants from central Vietnam and Laos.

Cycas longipetiolula, which is often considered synonymous with Cycas bifida but may have hybridized with Cycas multipinnata, is only found in cultivation in Jinping County, Yunnan.[2]

Habitat

It is native to areas of dense

Longzhou, Guangxi
, China was established for the protection of this cycad, of which the Chinese populations are considered endangered. It is rarely found in cultivation.

References

  1. ^ Nguyen, H.T. (2010). "Cycas bifida". IUCN Red List of Threatened Species. 2010: e.T42059A10615518. Retrieved 26 June 2022.
  2. ^ Zheng Y, Liu J, Feng X, Gong X. 2017. The distribution, diversity, and conservation status of Cycas in China. Ecol Evol. 2017;7:3212–3224. https://doi.org/10.1002/ece3.2910