Bushy, anise-scented, annual herbs 10-30 cm tall; stems glabrous, slender, green to purplish, striate, much branched. Leaves opposite, or alternate above, short-petioled, pinnately dissected, 1-2 cm long, the lobes linear, 1-8 mm long, 0.2-0.5 mm wide, mucronate to aristate, the lowermost usually reduced to slender bristly cilia, marginally scabrid to glabrescent, densely punctate on the under-surface with tiny round translucent oil glands. Inflorescence of leafy bracted cymes; peduncles slender, 1-20 mm long. Heads radiate or discoid; involucre ellipsoid to cylindric, 2-3 mm diam., the bracts 5, linear to narrowly elliptic, 6-7 mm long, marginally connate nearly to the abruptly short-aristate tips, several-nerved, more-or-less indurate-keeled below, glabrous, densely punctate in irregular lines with tiny round, translucent oil glands; receptacle short-conic, pitted; ray florets 0-2, inconspicuous, white to pale yellow, the tube slender, glabrous or minutely puberulent, 1-2 mm long, the ligules ovate, ca. 1 mm long; disc florets 5-10, the corollas pale yellow, slender, 3-4 mm long, glabrous, the lobes slender, 0.5-1 mm long, the anthers 0.5 mm long, tapering to short, acute appendages, the style branches ca. 0.5 mm long, included or scarcely exserted. Achenes 3-4.5 mm long, black or brown, linear to narrowly turbinate, strigillose; carpopodium short, knoblike; pappus of 2-3 stiff, scale-based bristles 3-4 mm long and 2 lacerate-margined scales 1-2 mm long. Chromosome number n =12
More
A herb. It grows each year from seed. It grows 5-40 cm tall. The leaves are opposite and divided. They are 1.5-3 cmlong by 1-2 cm wide with 4-7 pairs of segments.
Moist, open or brushy, often rocky plains and slopes, common in pine-oak forest, often a weed in cornfields, at elevations from 900-2,500 metres.
More
It is a tropical plant. In Argentina it grows between 1,000-4,400 m above sea level.
Home
