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Electronic Flora of South Australia species Fact Sheet

Family: Asteraceae
Berkheya rigida

Citation: Ewart, Jean White & B. Rees, Proc. R.Soc. Vic. n. ser. 22:20 (1909).

Synonymy: Stobaea rigida Thunb., Prod. Pl. Cap. 141 (1800). , Berkheya rigida

Common name: African thistle.

Description:
Rigid perennial herb to 65 cm high, with rhizomes; stems erect or ascending, branched, rather woody, terete, sparsely white-tomentose; leaves cauline, sessile, amplexicaul, lanceolate, pinnatisect with spine-tipped lobes, 4-9 cm long, 2-4 cm wide, green and subglabrous above, whitetomentose below; margins revolute.

Inflorescence a compound panicle of pedicellate capitula in terminal and axillary corymb-like clusters; involucral bracts spreading, lanceolate, entire, spine-tipped, concave and tomentose below, in 3 or 4 unequal series, to 12 mm long; receptacle 3-4 mm diam., with deeply lacerate scales; ray florets absent; disk florets 30-40, far exceeding the involucre, yellow.

Achenes c. 3 mm long, glabrous; pappus scales minute, connate into a crown.

Published illustration: Meadly (1965) Weeds of Western Australia, p. 153.

Distribution:  An uncommon weed.

S.Aust.: EP.   W.Aust.; Vic.

Conservation status: naturalised

Flowering time: Oct. — Dec.


SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia

Biology: No text

Author: Not yet available


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