Boulos in H. Eichler, Suppl. 331 (1965).
Synonymy: S. asper (L.) Hill var. gracilis sensu Cleland, S. Aust. Field Nat. 23~ 4:12-13 (1946), non Albert.
Common name: Native sow-thistle.
Annual, biennial or possibly perennial herb 50-120 cm high with a woody tap root; stem erect, usually unbranched, hollow, glabrous; basal leaves narrowly oblanceolate, shallowly sinuate-pinnatifid to entire with denticulate margins, 5-30 cm long, 1-3 cm wide, glabrous; cauline leaves oblanceolate to lanceolate, acute, with rounded appressed auricles, pinnatifid denticulate, 10-40 cm long, 2-6 cm wide, stiffly herbaceous, glabrous, prominently net-veined; peduncles 2-7 cm long, usually glandular-hairy, with 1-3 bracteoles.
Capitula in a panicle of umbel-like groups; involucres 10-12 mm long; bracts glabrous to glandular-hairy, entire; florets 100-200; ligules 4-5 mm long.
Achenes flattened, elliptic, 2.7-3.7 mm long, smooth, 3-ribbed on each face, with narrowly winged margins somewhat scabrous at both ends, brown to buff; pappus c. 8 mm long, more or less caducous.
Temporarily wet ground, edges of lakes and streams.
S.Aust.: NW, LE, FR, EP, NL, MU, YP, SL, KI, SE. W.Aust.; Qld; N.S.W.; Vic. New Guinea; New Zealand.
Flowering time: most of the year.
SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia
Close to S. asper, and likely to be an autotetraploid derived from S. asper subsp. glaucescens (Boulos, 1973); resembles the African S. gigas, a tetraploid which may have had a parallel origin from S. asper.
Not yet available