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{{Taxobox
| color = lightgreen
| name = ''Cycas aculeata''
| status = DD
| trend =
| regnum = [[Plant]]ae
| divisio = [[Cycad]]ophyta
| classis = [[Cycad]]opsida
| ordo = [[Cycad]]ales
| familia = [[Cycas|Cycadaceae]]
| genus = ''[[Cycas]]''
| species = '''''C. aculeata'''''
| binomial = ''Cycas aculeata''
| binomial_authority = K.D.Hill & H.T.Nguyen
}}

'''''Cycas aculeata''''' is a species of [[cycad]] in the genus ''[[Cycas]]'', native to [[Vietnam]], where it is [[endemic (ecology)|endemic]] to a single site on the south slopes of the [[Hai Van]] pass.

It has a short subterranean stem 15-18 cm diameter, which bears 6-23 [[leaf|leaves]]. The leaves are 1.8-2.5 m long, and pinnate, with 100-150 leaflets and several basal spines; they are glossy dark green, but covered in orange pubescence at first which soon wears off. The leaflets are 35-52 cm long and 13-19 mm wide, and the basal spines .

The name derives from the latin aculeatus, which translates as "prickly", indeed has short prominent spikes along the [[Petiole (botany)|petiole]] (the leaf stalk). The stems are usually to slightly emergent, with trunk 6 inches in diameter. Emergent leaves are bright orange, and turn dark green with age, somewhat similar to [[Zamia integrifolia]] by coincidence.

The male [[strobilus|cones]] are solitary, 15-20 cm long and 4-6 cm diameter; the female cones are undescribed.

===Habitat===
This cycad is one of a number of related subterranean species native to SE Asia. It is most closely related to ''[[Cycas balansae]]'', little is known about this cycad. It grows in deep [[loam]] over [[granite]] in the inner forests of Vietnam. During the [[Vietnam war]], herbicide spraying and mass bombings may have severely upset the plant's native habitat and may have killed many of the plants.

==References==
*[http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/cycadpg?taxname=Cycas+aculeata Cycad Pages: ''Cycas aculeata'']

[[Category:Cycads]]
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