Common name: Mat Spurge, Caustic Weed
Euphorbia dallachyana Baill. APNI* Synonyms: Chamaesyce dallachyana (Baill.) D.C.Hassall APNI*
Euphorbia minutifolia Boiss. APNI*
Description: Perennial herb with prostrate, ascending or decumbent stems mostly to 20 cm long, glabrous.
Leaves circular, ovate or oblong, 2–10 mm long, 1.5–5 mm wide, margins entire or finely toothed, base asymmetric; petiole to 1 mm long; stipules mostly interpetiolar.
Cyathia very small on peduncles to 1 mm long; involucre c. 0.7 mm long, glands ± ovate, red, with pink or white, narrow, mostly entire appendages.
Capsule c. 1.5–1.8 mm long with a fringed receptacle appendage appressed to base, green, glabrous; seeds pink to brown, with 4 longitudinal ridges.
Flowering: summer.
Distribution and occurrence: Weed in pasture, on river banks or near railways. Reported as causing HCN poisoning in sheep.
NSW subdivisions: NC, CC, CT, ST, NWS, CWS, NWP, SWP, SFWP
Other Australian states: Qld N.T. S.A. W.A.
Text by T.A. James & G.J. Harden, as Chamaesyce dallachyana in Flora of NSW 1 (1990)
Taxon concept: Halford, D.A. & Harris, W.K. (2012), A taxonomic revision of Euphorbia section Anisophyllum Roeper (Euphorbiaceae) in Australia. Austrobaileya 8(4): 481-484; accepted by APC (accessed January 2017)
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.
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