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:
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An uncommon weed.
S.Aust.: EP. W.Aust.; Vic.
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Conservation status:
naturalised
Flowering time: Oct. — Dec.
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SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia
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Biology:
No text
Author:
Not yet available
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