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Electronic Flora of South Australia species Fact Sheet

Family: Compositae
Helipterum troedelii

Citation: F. Muell., Victorian Nat. 7:77 (1890).

Synonymy: H. troedelii F. Muell. var. patens Ewart, Jean White & B. Rees, Proc. R.Soc. Vic. 22:15 (1909).

Common name: None

Description:
Annual herb 4-28 cm high; stems several, ascending, simple or branched, sparsely cobwebby to tomentose; leaves alternate, linear to lanceolate, subamplexicaul, acute, 0.7-3 cm long, 1-4 mm wide, glabrous, flat with straight recurved margins.

Capitula shortly pedicellate to sessile in dense corymbose clusters; involucre campanulate, radiate, 6-10 mm long, 4-seriate, usually appearing glabrous; outer bracts ovate, acute, straw-coloured, scarious; inner bracts with oblong straw-coloured scarious-winged claws sometimes cobwebby on margins and white ovate acute to obtuse spreading laminae 3-4 mm long; receptacle conical; florets 10-15.

Achenes truncate-obovoid, 1.5-2 mm long, sericeous-villous; pappus bristles 7-12, dilated and connate to form a tube near the base, c. 3 mm long, evenly plumose above, persistent.

Distribution:    N.S.W.

Conservation status: native

Flowering time: Aug. — Oct.


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

Biology: Largely confined to the Flinders Ranges in S.Aust., and represented only by isolated collections from the other regions. Superficially resembles Helichrysum semifertile, but that species has pubescent brown achenes and yellowish barbellate pappus bristles.

Taxonomic notes: The variety patens Ewart, Jean White & B. Rees represents one extreme of the range of phenotypes with few, shortly pedicellate capitula, and is not recognised in this flora treatment. One of the syntypes of the variety (Fraser Range, W.Aust., 1891, R. Helms) is referrable to Helipterum chlorocephalum (Turcz.) Benth. The sheet AD 97650128 of the other type collection, Mt Lyndhurst, S. Aust., M. Koch 1644 is here designated as the lectotype.

Author: Not yet available


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