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Cycas simplicipinna (Smitinand) K.D.Hill
Proc. Third Internat. Conf. Cycad Biol. 150 (1995)
Family: CYCADACEAE

Cycad Cones in Joe's Cycad Gardens. Cycas simplicipinna female with matuere seeds.
Cycad Cones in Joe's Cycad Gardens. Cycas simplicipinna female with matuere seeds.

Synonyms:

Common Names include:
CHINESE (中文): 單羽蘇鐵

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.

24840 josef Josef Cycad Perner
Female, Megasporophylls in developments. Photo by: Josef Cycad Perner
24842 josef Josef Cycad Perner
Female, Megasporophylls with immature seeds. Photo by: Josef Cycad Perner

24841 josef Josef Cycad Perner
Male cones. Photo by: Josef Cycad Perner
24843 josef Josef Cycad Perner
Male cones in this species are small and narrow. Photo by: Josef Cycad Perner

24844 josef Josef Cycad Perner
Female with seeds. Photo by: Josef Cycad Perner
24845 josef Josef Cycad Perner
Female, Megasporophylls with immature seeds. Photo by: Josef Cycad Perner

25200 josef Josef Cycad Perner
Cycas simplicipinna Photo by: Josef Cycad Perner
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