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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
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 ...
The diagram shown above is a good representation of the life cycle of some multi-cellular algae (e.g. the genus Cladophora) which have sporophytes and gametophytes of almost identical appearance and which do not have different kinds of spores or gametes. [18]
The life cycle of a gymnosperm involves alternation of generations, with a dominant diploid sporophyte phase, and a reduced haploid gametophyte phase, which is dependent on the sporophytic phase. [3] The term "gymnosperm" is often used in paleobotany to refer to (the paraphyletic group of) all non-angiosperm seed plants.
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
Fight to mate; this behaviour is common among the blues. Left, upperside of female; right underside of male, from Adalbert Seitz. Luthrodes pandava [2] also called the Plains Cupid [3] [1] or cycad blue, is a species of lycaenid butterfly found in South Asia, [3] Myanmar, United Arab Emirates, Indochina, Peninsular Malaysia, Singapore, Taiwan, Java, Sumatra and the Philippines. [1]
The tallest Cycas pectinata is a female plant in North Kamrup, Assam which measures 52.8 feet (16.1 m). The tree is the world's tallest Cycas plant. [ 11 ] In Northeast India, the species is under severe threat due to clearing of forest and overcollection of male cones for preparation of traditional medicines.