Pycnosorus Benth.


Greek pyknos — dense, soros — heap, a reference to the dense florets in compound heads.

Annual or perennial herbs, variously hairy. Stems 1 or few, erect, unbranched. Leaves basal and/or along stems, alternate, margins entire, basal leaves withering early. Capitula diskoid, few-flowered, usually 40-200 grouped together in dense terminal compound heads, sometimes surrounded by a common involucre. Involucral bracts few, overlapping, membranous, yellow. Common receptacle with scales, spherical to conical. Florets bisexual, tubular, yellow. Achenes obovoid, silky. Pappus a ring of feathery bristles variously fused at base and yellow at tip.

Yellow spherical compound heads.

6 species from Australia.

Everett & Doust (1992).

Source: Lawson, L.; Spencer, R. (2002). Dahlia. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 4. Flowering plants. Dicotyledons. Part 3. The identification of garden and cultivated plants. University of New South Wales Press.

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kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Asteranae
order      Asterales
family       Asteraceae
Higher taxa
Subordinate taxa
species         Pycnosorus globosus Benth.