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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 ...
Dioon edule, the chestnut dioon, is a cycad native to Mexico, also known as palma de la virgen. Cycads are among the oldest seed plants and even pre-date the dinosaurs. [3] It belongs to the Zamiaceae plant family within the order Cycadales. The genus name "Dioon" means "two-egged", referring to the two ovules (see photo below).
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.
The cycad is a small tree, growing to about 10 m (33 ft) in height, with a trunk diameter of up to 40 cm (16 in). ... The seeds are 45 mm long and 30 mm wide ...
The seeds when mature measure about 5 cm (2.0 in) long by 4 cm (1.6 in) wide and are sheathed in a bright red sarcotesta. [4] [5] [6] It is reputed to be the tallest known species of cycad and it towers over other understorey vegetation, but rarely reaches the forest canopy. [6] [7]: 4
The leaf-like character of Sporophylle gives Dioon a special position within the cycads. Dehgan & Dehgan described the genus as the most primitive of the cycads and suggested they put them into their own family. [15] A molecular genetic study of the chloroplast DNA revealed that it is at least the most primitive genus of neotropical cycads. [16]
Encephalartos horridus, the Eastern Cape blue cycad, [3] is a small, low-growing cycad up to 0.9 m (3.0 ft) high and 0.9 m (3.0 ft) wide. [4] It is a native of Eastern Cape Province , South Africa , and found in arid shrublands, most commonly on ridges and slopes with shallow soils.
The plant has red seeds, about 1.3 to 1.8 centimeters long and 0.5 to 0.8 centimeters in diameter. Zamia fischeri can be distinguished from Zamia vazquezii by having smaller leaves (15-30 centimeters), lancelike leaflets , and no prickles on its petioles .
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