Family: Asteraceae
Sigesbeckia
Citation:
L., Sp. Pl. 2:900 (1753).
Synonymy: Not Applicable Common name: Indian weeds.
Description:
Annual herbs; stems erect; leaves cauline, opposite, flat, sessile or with winged petioles, simple, dentate.
Capitula small, heterogamous, radiate, pedunculate, in terminal cymes with repeated branches subtended by reduced leaves; involucres broadly campanulate, 2-seriate; outer bracts 5, herbaceous, spreading; inner bracts c. 8, herbaceous, each enclosing a ray floret; receptacle convex; receptacular scales prominent, herbaceous, each enclosing a disk floret, ultimately deciduous with the ripe achenes; ray florets uniseriate, female, fertile, ligulate; style branches short, linear, obtuse; disk florets bisexual, fertile, tubular; anthers obtuse at the base, with a short obtuse appendage at the apex; style branches short, acute, with hairs on the outer faces.
Achenes compressed-ovoid, curved; pappus absent. (R. K. Brummitt (1967) Proc. Botl Soc. Br. Isl. 7:19-21.)
Distribution:
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5 species widely distributed in tropical and temperate regions.
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Biology:
No text
Key to Species:
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1. Outer involucral bracts linear to oblanceolate, not exceeding the florets and achenes, without glands |
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S. microcephala 1. |
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1. Outer involucral bracts spathulate, far exceeding the florets and achenes, densely covered with dark stalked glands |
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S. orientalis 2. |
Author:
Not yet available
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