Bidens pilosa

Tarla suketeni

Stem glabrous or subglabrous. Leaf 1-pinnately divided; segments 3−5, ovate, lanceolate; upper surface of lamina subglabrous, beneath tomentose, adpressed pilosulose, cuneate at base, apices mostly acute, sometimes acuminate, margins serrate; terminal leaflets 3−10 × 0.7−3.5 cm; lateral leaflets 1.5−6 × 0.3−2 cm; petiole 1−7 cm. Capitula solitary to corymbose; capitula radiate or discoid; peduncules 3−5 cm pilose, hispidulous, elongate in fruiting time; calycular bracts mostly 8, spathulate to linear, 4−6 mm pilosus to pilosulose, hispidulous; involucres turbinate to campanulate, 4−8 × 6−10 mm; phyllaries mostly 8, lanceolate, 4−6 mm, margins scarious winged, ciliate. Ray florets mostly 5, lamina whitish, 10−12 mm. Disc florets 25−50, yellowish 3−5 mm, tubulate. Palea similar to phyllaries, slightly shorter or equal to disc flowers. Achenes dark brown to blackish, light brown to yellowish at apex, 6-10 mm, hispid to antrorsely hispidulous or strigose at apex; pappus 3−4 barbed, 1−2.5 mm; outer achenes ± flat linear to narrowly cuneate, each surface obscurely 2-grooved, subglabrous at basal; inner achenes ± equally 4-angled, linear, surface of all side 2-grooved, truncate at apex.

Introduced