Citation: Bertol., Lucub. re Herb. 38 (1822).

Synonymy: X. pungens Walk., Beitr. Bot. 1:236 (1842); X. chinense sensu McMillan, Aust. J. Bot. 23:173~192 (1975).

Common name: Noogoora burr, clotburr, cockleburr.

Description:
Annual herb to 2 m high; stems erect, branched, hispid, unarmed; leaves broad-ovate to triangular, distinctly 3- or 5-lobed, serrate, cordate at the base, 5-15 cm long, 5-15 cm wide, green and scabrous on both surfaces, prominently veined with 3 reddish main veins, on petioles 3-9 cm long.

Inflorescences axillary and terminal, sessile, racemose, with 1-12 female and 0-7 male capitula in separate groups.

Fruiting capitulum ellipsoid, 12-18 mm long, glandular-pubescent, dark-brown, with numerous hooked spines 2-3 mm long: beaks straight, hardly diverging, 3-5 mm long.

	Burr.
Image source: fig. 651b in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).

Published illustration: Cunningham et al. (1982) Plants of western New South Wales, p. 727.

Distribution:  Weed of land subject to occasional flooding, on alluvial soils.   Qld; N.S.W.; Vic.   Native to North America and the Caribbean. Conservation status: naturalised Flowering time: Dec. — April.

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

Biology: Abundant in the eastern States, but as yet of very sporadic occurrence in S.Aust. Reputed to be toxic to stock, especially in the early stages of seedling growth.

Author: Not yet available