Cycas is a genus of plants belonging to a very ancient lineage, the Cycadophyta, which are not closely related to palms, ferns, trees or any other modern group of plants.
Cycas revoluta, 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 thick coat of fibers on its trunk.
Cycas circinalis, also known as the queen sago, is a species of cycad known in the wild only from southern India. Cycas circinalis is the only gymnosperm species found among native Sri Lankan flora.
Cycas rumphii, commonly known as queen sago or the queen sago palm, is a dioecious gymnosperm, a species of cycad in the genus Cycas native to Indonesia, New Guinea and Christmas Island. Although palm-like in appearance, it is not a palm.
Cycas pectinata is a slow-growing, evergreen palm-like plant with an erect, occasionally branched main stem that can eventually be around 2 - 12 metres tall and 14 - 20cm in diameter (exceptionally to 100cm); each stem is topped by a crown of 30 - 40 large leaves that can each be around 150 - 240cm long. The plant can lose its leaves in cool or dry conditions.
Cycas panzhihuaensis is a rare and vulnerable species of cycad known in the wild only from Sichuan and Yunnan provinces in China. It can be seen at the South China Botanical Garden in Guangzhou and is also cultivated for horticulture, where it is often known as the Dukou sago palm.
Description:Cycas taitungensis is a relict species from Taiwan. It is an elegant erect palm-like plant with a stout simple or branched trunk up to 5 m tall; the leaves forming a graceful crown at the summit.
This cycad, native to coastal Tanzania and Mozambique, the Comoros Islands and eastern Madagascar is not only one of the largest species in the Cycadales, but is also probably the oldest, having been around for a possible 140 millon years with little change in apprearance. It is undoubtedly the fastest growing cycad, reaching 60 cm (2 ft.) in its first year from seed. The large seeds contain a pocket with a spongy substance that makes them float, unlike most cycads. They are distributed by ocean currents.
Cycas beddomei is a species of cycad in the genus Cycas, native to India, where it is confined to a small area of Andhra Pradesh state in the Tirumala Hills in scrubland and brush covered hills. Superficially similar to Cycas revoluta, it has erect, solitary stems.
Cycas cairnsiana is a species of cycad in the genus Cycas, native to northern Australia in northern Queensland on the Newcastle Range. The stems grow to 2–5 m tall and 12–16 cm diameter.
This name was often given to a much more common cycad, Cycas taitungensis, a native of Taiwan. However, this cycad, which looks quite a bit different and is so rare in the wild it may actually be extinct, is from mainland China, not Taiwan (though it was first collected there and described). Only known specimens are in cultivation now- and have been in cultivation for centuries in China. It is a rather sparse headed plant relative to the more common C taitungesis (which itself is sometimes confused with SAgo Palms)- more like Cycas rumphii (or what people mistakenly call Cycas circinalis). This species is rare if not unknown in the US right now, but should become more popular as seed makes its way over from Asia.
From around Darwin in northernmost Australia, where it grows in monsoonal forest, hails this slender-trunked species with elegantly arching leaves that hold many narrow, glossy, apple-green leaflets. While it forms extensive stands in its natural habitat, it is not well known in cultivation but would be highly recommended for the drier tropics and warm subtropics.
A large and robust cycad from a small area in northern Australia, where it grows in seasonally dry grass and woodlands. The tall, occasionally branching trunk holds a spherical crown of distinctly keeled, arching, gray-green leaves with narrow leaflets. An imposing plant for the drier tropics and warm subtropics.
Cycas bifida is a species of cycad plant in the genus Cycas, native to southern China, and northern Vietnam. The stems are largely subterranean, 20–60 cm in diameter and up to 20 cm above ground level, and bear three to eight leaves.
Cycas calcicola is a species of cycad in the genus Cycas, native to northern Australia in the northwest of Northern Territory. The stems are erect, 2–5 m tall and 16–22 cm diameter.
Cycas balansae is native to southwestern China, southeastern Guangxi province and also just south, across the border in northern Vietnam. It grows in mountain rainforests. This relatively cold-tolerant cycad is named for Benedict Balansa, a French botanist.
Cycas balansae has a subterranean, solitary trunk, 5-8 inches in diameter. It will carry from 5-10 leaves, generally, of which each leaf is 3.5 to 9 feet long. It has spiny petioles, and very thin yet wide leaflets.
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.
Cycas apoa is a species of cycad in the genus Cycas, native to northern New Guinea and Halmahera Island. It occurs in the Sepik River basin, in wet lowland forest in modestly seasonally flooded areas. It has erect stems up to 2.5 m tall.
Cycas basaltica is a species of cycad in the genus Cycas, native to Australia, in the far north of Western Australia in the Kimberley region. The stems grow to 2 m tall and 15–23 cm in diameter, with a swollen base and an enlarged subterranean structure.
Cycas canalis is a species of cycad in the genus Cycas, native to northern Australia in the northwest of Northern Territory, where it occurs in two areas, on the coast at Channel Point, and inland in the Daly River area near Dorisvale. The stems are erect, growing to 3–5 m tall and 7–14 cm diameter.
A rather large cycad from Bougainville Island, New Britain and the Solomon Islands, where it grows in coastal areas. It is a vigorous, fast growing species with a trunk to 5 m (17 ft.) tall. The leaves reach nearly 3 m (10 ft.) in length and have very broad, glossy green leaflets.
Cycas arnhemica is a species of cycad in the genus Cycas, native to Australia, in the northwest of Northern Territory in Arnhem Land, after which it is named. The stems are erect, growing to 1.5-2.5 m tall.
Cycas campestris is a species of cycad in the genus Cycas, native to southeastern Papua New Guinea in the lowland region near Port Moresby. It grows in open, grassy locations, often in areas with frequent grass fires. The stems are erect, up to 2.5 m tall and 20 cm diameter.