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Sigesbeckia orientalis L. subsp. orientalis Family Asteraceae
Common name: Indian Weed

Sigesbeckia orientalis subsp. orientalis L. APNI*

Description: Erect herb to 80 cm high; stems slightly pubescent, brown.

Leaves lanceolate to spear-shaped, 2–15 cm long, 1–7 cm wide, in remote pairs, petiolate, pubescent, with glandular hairs, veins prominent.

Heads 10 mm diam.; outer involucral bracts irregular, spreading, narrow-spathulate, 7–11 mm long, densely covered with dark stalked glands. Ray florets c. 8, ligules 1–2 mm long, broad-oblong, 2- or 3-toothed at apex, yellow. Disc florets 10–15, yellow.

Achenes 2–3 mm long, slightly angled, black.


Flower
Photo W. Cherry

Herbarium
Sheet

Flowering: summer–autumn.

Distribution and occurrence: Grows in soils ranging from shallow stony to grey soils of river banks, west to Cobar district, native of Northern Australia, Asia and Africa.
NSW subdivisions: NC, CC, SC, NT, CT, ST, CWS, NWP, SWP
Other Australian states: Qld Vic. *Tas. *W.A. S.A. N.T.
AVH map***

There is debate about this species being native or introduced. See Bean, A.R.(2007) Australian Systematic Botany 20, 1-43, in particular page 20. Updated L. Murray (September 2011). NSW Herbarium treats this species as native.

Text by Louisa Murray
Taxon concept: Flora of NSW Volume 3, 1992.

The single subspecies in NSW. Characters and distribution as for the species in NSW.

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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