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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 to several meters tall.
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.
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 ...
While there are more than 200 species of cycads, only one is native to Florida, and only a couple are popular landscaping plants in our area.
Cycadeoidea gibsoniana is a species collected from Lower Greensand from Luccombe Chine on the Isle of Wight, notable for the remarkable state of preservation of its plant parts. The original specimen was found by Thomas Field Gibson and was extensively broken and sliced to examine its anatomy.
As with all cycads, members of the Zamiaceae are poisonous, producing poisonous glycosides known as cycasins. The former family Stangeriaceae (which contained Bowenia and Stangeria) has been shown to be nested within Zamiaceae by phylogenetic analysis. [1] The family first began to diversify during the Cretaceous period. [2] [3]
The leaves can be completely lost during cold periods, with the plant lying dormant in its tuberous root system, allowing this cycad to be relatively cold hardy. The plant can survive up to USDA region 8b (10° to 20°F). The stems and leaves regenerate after the cold period subsides with full foliage. [8] [9]
It is the largest of all cycads, with multiple stems both upright and prostrate, each as much as sixty feet (18 meters) in length, [3] and bearing a rosette of massive once-pinnate fronds up to 25 feet (eight meters) in length, forty inches (100 cm) in width, and with a petiole or stalk up to three inches (7.6 cm) thick where it joins the stem or trunk.
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