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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.
Both male and female cycads bear cones , somewhat similar to conifer cones. Cycads have been reported to fix nitrogen in association with various cyanobacteria living in the roots (the "coralloid" roots). [4] These photosynthetic bacteria produce a neurotoxin called BMAA that is found in the seeds of cycads. This neurotoxin may enter a human ...
Cycas revoluta (Sotetsu [Japanese ソテツ], sago palm, king sago, sago cycad, Japanese sago palm) is a species of gymnosperm in the family Cycadaceae, native to southern Japan including the Ryukyu Islands. It is one of several species used for the production of sago, as well as an ornamental plant. The sago cycad can be distinguished by a ...
Cycas micronesica is a species of cycad found on the island of Yap in Micronesia, ... The female cones are pale fawn to pale orange-brown, narrowly ovoid, 30–50 cm ...
The pollen grains are streamlined and have only one germ line (monosulcate). The male cones fall off after one year. The female cones are also stalked and can remain on the plant for more than a year. The female microsporophyll are more leaf-like than those of other cycads, the greatest similarity to those of the genus Cycas. The scales are ...
The female cones are open, with sporophylls 16–25 cm long, with two to four ovules per sporophyll. The lamina is lanceolate, with spined dentate margins and an apical spine. The male cones are solitary, ovoid, 15–22 cm long and 8–12 cm diameter, orange, the sporophylls 35–45 mm long with an upturned apical spine.
Cycas angulata is a species of cycad in the genus Cycas, ... The female cones are open type sporophylls 25–50 cm long, brown, each with 6-12 ovules each.
The female cones are open, with sporophylls 15–20 cm long, with pink-brown coloured tomentose down, with two ovules. The cones emerge in November to December, ripening in March to May. The lamina margin is strongly toothed, with an acuminate point. The sarcotesta is yellow to brown. The male cones are solitary, ovoid, 30 cm long and 7.5 cm ...