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Flora of Australia Online

GYMNOSTOMA

K.L.Wilson, L.A.S.Johnson

Gymnostoma L.A.S.Johnson, Telopea 2: 83 (1980); from the Greek gymnos (naked) and stoma (mouth), in reference to the exposed stomates on the branchlets.

Type: Gymnostoma nodiflorum (Thunb.) L.A.S.Johnson

Trees or tall shrubs, dioecious or monoecious. Young persistent branchlets similar to deciduous branchlets; all articles quadrangular; furrows shallow and open, exposing stomates. Leaves in whorls of 4. Male inflorescences on branchlets similar to vegetative branchlets, simple or appearing compound owing to condensation of branching; bracteoles persistent. Female inflorescences on short or elongated branchlets similar to vegetative branchlets. ‘Cones’ mostly borne amongst assimilatory branchlets; bracts much expanded laterally, broader than high; bracteoles protruding, rounded on back but neither split nor with a dorsal protuberance. Samara body striate, glabrous, yellow-brown or greyish, dull. 2n = 16 (3 spp. studied), B.A.Barlow, Austral. J. Bot. 7: 232 (1959), and B.A.Barlow pers. comm. 

A tropical genus of 18 species in Malesia, Fiji, New Caledonia and north-eastern Australia; 1 species endemic in Australia. 

australianum

 

Data derived from Flora of Australia volume 3 (1989), a product of ABRS, ©Commonwealth of Australia