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Cycads in South Africa. Cycads / ˈ s aɪ k æ d z / are seed plants that typically have a stout and woody trunk with a crown of large, hard, stiff, evergreen and (usually) pinnate leaves. The species are dioecious, that is, individual plants of a species are either male or female. Cycads vary in size from having trunks only a few centimeters ...
Cycas aculeata is a species of cycad in the genus Cycas, native to Vietnam, where it is 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 leaves. The leaves are 1.8-2.5 m long, and pinnate, with 100-150 leaflets and several basal spines; they are glossy dark ...
Most parts of the Macrozamia miquelii are toxic with the seeds of the cycad having a higher concentration of azoxyglycosides, including cycasin and macrozamin, than other parts of the plant. [20] Other toxins identified within the cycad include β-Methylamino-L-alanine (BMAA) which acts as a powerful neurotoxin if ingested.
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. [4] [5]
Cycas brachycantha is a species of cycad in the genus Cycas, native to northern Vietnam where it is endemic to Bắc Kạn Province. It grows in often soil-free cracks and crevices of limestone crests and ridges under the canopy of evergreen forests. It is found in Ba Bể National Park.
Cycas sexseminifera is a species of cycad in northern Vietnam and southern China. Range. It is widespread in: [2] southern and central Guangxi, China;
The name Cycas inermis, meaning "unarmed", may be confusing because spines, albeit very small ones, are present on the petiole.The trunk of this cycad is erect with growth rings (see illustration): it is up to 1.5–4 m high and with a diameter of 80–140 mm. [3]
This cycad contains reddish seed cones with a distinct acuminate tip. The leaves are 60–120 cm (2.0–3.9 ft) long, with 5-30 pairs of leaflets (pinnae). Each leaflet is linear to lanceolate or oblong-obovate, 8–25 cm long and 0.5–2 cm broad, with distinct teeth at the tip.