Donate now to support the LLIFLE projects.
Your support is critical to our success.
Cycas bifida (Dyer) K.D.Hill
Bot. Rev. (Lancaster) 70: 161 2004
Family: CYCADACEAE

Cycas bifida Photo by: Josef Cycad Perner

Synonyms:

Common Names include:
ENGLISH: Fork-Leafed Cycad
CHINESE (中文): 叉叶苏铁, cha ye su tie

Subspecies, varieties, forms and cultivars of plants belonging to the Cycas micholitzii group

Cycas simplicipinna, Cycas micholitzii, Cycas bifida and Cycas multipinnata forms a group. C. simplicipinna has undivided pinnae, whereas C. micholitzii and Cycas bifida have pinnae that are once dichotomous, and C. multipinnata has pinnae that are two to five times dichotomous. Thus there is a transformation series from simple to dichotomous to multidichotomous. This phenomenon becomes even more interesting when examining the development from seedling to adult of individual plants of C. micholitzii and C. multipinnata. In C. micholitzii, the first leaf has undivided pinnae, the second leaf has one dichotomous pinnae. In C. multipinnata, the first leaf has undivided pinnae, the second leaf has one dichotomous pinnae, the third through fifth leaves have a pinnae where one of the dichotomies is itself dichotomous resulting in a tripartite pinnae, and the sixth and subsequent leaves have pinnae with multiple dichotomies resulting in leaves that have a minimum of three dichotomies per pinna. Thus, we not only have a transformation series between species but also within a species.

  • Cycas bifida (Dyer) K.D.Hill: has few arching fronds with long petioles shooting out of a small, dome-shaped caudex and glossy leaflets bifurcated very near to the base. Distribution: China (Guangxi, Yunnan) and northern Viet Nam (Cao Bang, Lang Son and Tuyen Quang).
  • Cycas micholitzii Dyer: is mostly stemless with, erect fronds, comparatively short and narrow leaflets are bi-pinnate, in other words they split dichotomously, two or three times, giving a most un-cycad like appearance. Distribution: China, Vietnam and Laos.
  • Cycas multipinnata C.J.Chen & S.Y.Yang
  • Cycad Cones in Joe's Cycad Gardens. Cycas simplicipinna female with matuere seeds.Cycas simplicipinna (Smitinand) K.D.Hill: is mostly stemless with large, erect fronds with broad and well-spaced undivided leaflets, small microsporangiate cones, small megasporophylls with short spines on the apical lamina. Distribution: China,Viet Nam and Thailand.


Your Actions
Cycas Back to Cycas index
Cycadaceae Back to Cycadaceae index
Palms & Cycads Back to Palms And Cycads Encyclopedia index