Common name: Scourweed
Sisyrinchium rosulatum E.P.Bicknell APNI*
Synonyms: Sisyrinchium exile E.P.Bicknell APNI*
Sisyrinchium sp. A sensu James & Brown (1993) APNI*
Sisyrinchium sp. A APNI*
Description: Tufted annual herb, 5–20 cm high; stems simple or branched, slightly compressed, winged.
Leaves linear, 2–7 cm long, 1–3 mm wide; spathe bracts lanceolate, subequal, 1.5–3 cm long, apex acuminate, margins scarious, white.
Perianth c. 7.5 mm long, 5–7 mm diam., more or less globose near the base, with tepals spreading at the apex, either pale yellow with brown-purple markings in centre, externally with median purplish markings, or pinkish to pale lavender or mauve with a yellowish throat and darker purplish markings, pubescent below; lobes oblong-acuminate. Ovary c. 1 mm diam., minutely hairy.
Capsule globose, 2–4 mm diam., glabrous, green to reddish; seeds globose, c. 0.7 mm diam., wrinkled, black.
Distribution and occurrence: Widely naturalised in NSW, including LHI. Native of South America (southern Brazil to Argentina); also introduced in many areas, including Norfolk Island, New Caledonia, New Zealand, Hawaii, Fiji, Easter Island, North America, Java, New Guinea, China, Japan, India, Madagascar, France, Italy.
Usually grows in disturbed areas (even in its native regions).
NSW subdivisions: *NC, *CC, *SC, *NT, *CT, *ST, *NWS, *CWS, *NWP, *SWP, *LHI
Other Australian states: *Qld *Vic. *W.A.
This has a flower that is strongly convex in outline near the base, with tepals spreading at the apex and in a range of colours from pink to lavender to yellow. Sometimes separated into two species: S. exile, with yellow tepals, and S. rosulatum, with whitish or bluish purple tepals and generally larger in all parts than the former. However, these differences may only be minor variants and this is treated as a single variable taxon pending further study. Reported to be toxic to stock.
Text by T. A. James & E. A. Brown (1993) as S. sp. A; edited KL Wilson (Jan 2015)
Taxon concept: Flora of NSW 4 (1993) as S. sp. A
APNI* Provides a link to the Australian Plant Name Index (hosted by the Australian National Botanic Gardens) for comprehensive bibliographic data
***The AVH map option provides a detailed interactive Australia wide distribution map drawn from collections held by all major Australian herbaria participating in the Australian Virtual Herbarium project.