Key to the species and description.

Description of the genus.

Occurs in broken sandstone country. Etymology, description, habitat, and an illustration.

Named after collector John Armstrong. Photo, historical notes, distinguishing features, and typification.

Named after its habitat, central Arnhem Land in Australia. Detailed description, illustrations, and a subspecies.

Occurs on Australia's Badu Island. Description of relevant morphological features.

Prefers basaltic lithologies. Distinguishing features, historical notes, structural details, and habitat.

Distributed and developed on Bougainville Island, Australia. Illustrations, a detailed description, and local vernacular terms for the plant.

Considered a restricted species. Detailed description, conservation status, and habitat.

Under considerable long-term threat from commercial collectors. Distinguishing features, habitat, and conservation status notes.

Occurs in open grassy country. Detailed structural description, habitat, and distinguishing characteristics.

Occurs at Channel Point, Australia. Distinguishing features, distribution, and subspecies.

The mountain of Khao Chamao is the only known habitat of this endangered species. Details, photos, historical notes, and conservation status.

Detailed morphological description of this green, glossy-leaved species.

This threatened species originates in Changjiang county in western Hainan province, China. Photos, a detailed description, habitat, and conservation status.

Honoring French botanist, explorer and historian Auguste Jean Baptiste Chevalier. Illustrations, structural details, etymology, habitat, and historical notes.

Lives on cliffs in Thailand. Historical notes, relevant literature, images, and subspecies details.

Found on the Con Dao group in Vietnam. Photos, details, physical characteristics, and historical notes.

Occurs on sandy soils over granites or coarse sandstones. Etymology, distinguishing features, morphology, and conservation status.

Named after forester and collector H. M. Curran. Physical description, distribution details, and related literature.

Endangered species found in the county of Debao in western Guangxi province, China. Distinguishing features, illustrations, habitat details, and conservation status.

Known only from two populations near Charters Towers, Australia. Distinguishing features and detailed morphology.

Formerly described as a subspecies of Cycas circinalis. Detailed description, etymology, distribution, images, and relevant literature.

Grows on coastal hills in southern Vietnam. Photos, morhology, etymology, and references.

This endangered species is typical of low, scrubby forests on steep slopes on limestone bluffs or screes. Description, photos, etymology, conservation status and history.

Known only from the wetter, eastern parts of Hainan Island. Illustrated physical description, etymology, history, conservation status and related history.

Endangered due to ornamental usage. Distinguishing characteristics, morphology, history, literature, and etymology.

Although the third species of Cycas to be recognized, this taxon has never been properly understood. Typification and historical notes, detailed description with illustrations, habitat and literature.

Discovered in 1842 on the island of Java and is now threatened with extinction. Etymology, morphological details, history and conservation status.

Occurs in the north-west of the Kimberley region of Western Australia. Distinguishing characteristics, habitat, and historical notes.

Named after Anders Lindström, a cycad enthusiast from Sweden. Pictures, morphological details, etymology, history, and conservation status for this endangered species.

Prefers seashore habitats. Distinguishing features, physical description, conservation status, and relevant references.

Honoring the late botanist John Maconochie. Distinctive characteristics, etymology, habitat, and detailed morphological information on subspecies.

Lives mainly in rainforests, which puts it at risk for extinction by habitat reduction. Illustrations, etymology, structural details, and extensive historical notes.

Named for its distinctive large seeds. Morphological description, conservation status, habitat, and etymology.

Endemic to Micronesia, the Marianas Group and the western Caroline Islands. Distinguishing features, description, conservation status, etymology, and historical notes.

Distinguished by its complex, branched leaflets. Illustrations, detailed morphology, distribution and habitat, conservation status, and historical notes.

Honoring Swedish palaeobotanist Alfred Gabriel Nathorst. Historical notes, distinctive characteristics, photos, structural details, and conservation status.

From the Nong Nooch tropical garden in Thailand. Physical description, distinguishing features, conservation status and habitat.

Mainly occurs on serpentinite-derived soils. Distinct features, morphology, etymology, and historical notes.

Abundant and widespread in Arnhem Land, Australia. Structural details, distinguishing characteristics, and habitat information.

Occurs in the Panzihua Prefecture of southern Szechuan Province, China. Morphology, illustrations, conservation status and historical notes.

Originates from Papua New Guinea. Physical description, distinct characteristics, and historical notes.

Contains several illustrations and a search link for other online resources regarding the taxon.

From the province of Pranburi in Thailand. Morphological description, images, distinguishing features, and history.

Covered with a waxy, whitish bloom. Physical description, distinguishing characteristics, illustration, and habitat.

Widespread in inland and montain-closed forests in the northern parts of the Philippines. Structural features, etymology, and historical notes.

Grassland species abundant in savannah forests in Papua New Guinea. Pictures, morphology, distinguishing features, etymology, and history.

Honoring English colonial administrator Sir Peter Henry Scratchley. Distinguishing features, structural details, distribution and habitat, conservation status, and history.

Usually found on calcareous beach dune sands or coral limestone formations. Morphology, images, history, features, and local vernacular terms.

Extremely widespread although severely depleted species through western Guangxi, China. Detailed description, conservation notes, and distinguishing characteristics.

Occurs in the farthest extremity of Cape York Peninsula, Australia. Morphological description, distinctive features, distribution, and conservation status.

This species was described when Thailand was Kingdom of Siam. Historical notes, illustrations, morphology, and related literature.

The name refers to the species' closed forest habitat. Photo, distinguishing features, conservation status, and detailed description.

Known for its rounded seeds, this taxon calls India home. Historical notes, detailed morphology, and distinctive characteristics.

From Szechuan province, China. Morphology, historical notes, conservation status, and habitat details.

Honouring Tan-Qing, director of the Shenzhen Fairy Lake Botanic Garden at the time this species was described. Distinguishing features, morphology, and conservation status.

Honouring Kampon Tansacha, of the Nong nooch Tropical Gardens, Thailand. Morphology, images, habitat, and conservation status.

Named after French botanist Louis-Marie Aubert du Petit-Thouars. Historical notes, distinguishing features, and illustrated morphological description.

Named after its discoverer Robert Tucker. Photograph, physical characteristics, distribution, and conservation status.

Honoring medical doctor H.W. Wade. Historical notes, images, conservation status, structural details, distribution and habitat.

Gets its name from its swordlike cataphylls. Detailed description, distribution, and conservation status.

Occurs on the Cape York Peninsula. Distinct characteristics, conservation status, morphology, and distribution.

Found in Sri Lanka. Historical notes, detailed morphological description, features, habitat, and conservation status.