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Cycas is a genus of cycad, and the only genus in the family Cycadaceae with all other genera of cycad being divided between the Stangeriaceae and Zamiaceae families. Cycas circinalis, a species endemic to India, was the first cycad species to be described in western literature, and is the type species of the genus.
The oldest records of the modern genus Cycas are from the Paleogene of East Asia. [31] Fossils assignable to Zamiaceae are known from the Cretaceous, [30] with fossils assignable to living genera of the family known from the Cenozoic. [18] Petrified cycad fossil, New York Botanical Garden
The gymnosperms (/ ˈ dʒ ɪ m n ə ˌ s p ɜːr m z,-n oʊ-/ ⓘ nə-spurmz, -noh-; lit. ' revealed seeds ') are a group of woody, perennial seed-producing plants, typically lacking the protective outer covering which surrounds the seeds in flowering plants, that include conifers, cycads, Ginkgo, and gnetophytes, forming the clade Gymnospermae [2] The term gymnosperm comes from the ...
Zamia furfuracea leaves. The genus comprises deciduous shrubs with aerial or subterranean circular stems, often superficially resembling palms.They produce spirally arranged, pinnate leaves which are pubescent, at least when young, having branched and simple, transparent and coloured hairs.
Cycas pectinata has the most widespread distribution in South Asia, and is the only South Asian cycad species found outside India and Sri Lanka. India Cycas ...
The flower-like williamsoniacean male reproductive structure Weltrichia is associated with the female reproductive structure Williamsonia, though it is uncertain whether the parent plants were monoecious (male and female reproductive structures being present on the same plant) or dioecious (where each plant has only one gender of reproductive ...
The leaves are a deep semiglossy green and about 50–150 cm (20–59 in) long when the plants are of a reproductive age. They grow out into a feather-like rosette to 1 m (3.3 ft) in diameter. The crowded, stiff, narrow leaflets are 8–18 cm (3.1–7.1 in) long and have strongly recurved or revolute edges.
Cycas, from a Greek plant name [23] [24] 1 genus, [25] scattered widely around Southeast Asia, northern Australia, and parts of India and Africa [26] Unisexual trunked plants with leaf bases that periodically sprout new leaves. The raw plants are toxic for humans, but carefully prepared starches from some species are added to certain Asian ...