Compact, dense, much or sparingly branched shrublet with axillary brachyblasts
Leaves in fascicles, involute ericoid with a skin-like indumentum beneath, occasionally with a few longer hairs, older leaves glabrous, acute to subacute, mucronate
Capitula discoid, solitary, 50-140-flowered
Involucral bracts in 8-11 rows, white; stereome undivided
Cypselas with wholly papillose, large narrowly oblong epicarp cells; endocarp of the persistent, enlarged, in transverse section equally long testa epidermis cells with brown inversely U-shaped wall thickenings and narrowly oblong from above
Pappus bristles barbellate, shaft apically widened with free clavate cells with very thick light-refractive walls
Nomenclature:
Hydroidea P.O.Karis
Karis: 29 (1990)
Anderberg: 74 (1991)
Anderberg: 331 (1994)
Distribution & Notes:
Southern Africa: Monotypic: Hydroidea elsiae (Hilliard) Karis, endemic to Western Cape
References:
ANDERBERG, A.A. 1991. Taxonomy and phylogeny of the tribe Gnaphalieae (Asteraceae). Opera Botanica 104
ANDERBERG, A.A. 1994. Tribes Inuleae, Plucheeae, Gnaphalieae. In K. Bremer, Asteraceae, cladistics and classification. Timber Press, Portland, Oregon
KARIS, P.O. 1990. Three new genera of the Asteraceae-Gnaphalieae from the Cape Region. Botanical Journal of the Linnean Society 102
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Biodiversity Advisor, developed by the South African National Biodiversity Institute (SANBI) and its Data Partners, is a system that will provide integrated biodiversity information to a wide range of users who will have access to geospatial data, plant and animal species distribution data, ecosystem-level data, literature, images and metadata.
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