Annual herbs 15-100 cm tall; stems erect, the lateral stems sometimes decumbent and rooting at the nodes, 1-7 mm diam., glabrous to pubescent with hairs to 0.7 mm long. Leaves ovate to rhombic (younger leaves approaching lanceolate), 1.8-14 cm long, 0.6-8.2 cm wide, acuminate to obtuse, the base attenuate (rarely obtuse to cordate), both surfaces infrequently strigillose with hairs 0.2 mm long, the margin entire to coarsely dentate-crenate; petioles 2-25 mm long. Inflorescence of solitary heads; peduncles 1.5-9 cm long. Heads radiate, 5-8 mm tall, 8-15 mm across; outer involucre cupulate, 6-10 mm diam., the bracts 5, connate 1/3-1/4 their length, imbricate, ovate-orbiculate, 3.5-6 mm long, 3-5 mm wide, obtuse, the abaxial surface glabrous to tomentose near peduncle, the margin herbaceous, tomentose near the base; paleas obovate, 2.5 mm long, 0.9 mm wide, apically yellow-orange, the margin dentate-erose, the midrib weak, glabrous; ray florets 8-13, tho ligules yellow-orange, oblong-elliptic, 3.5-7 mm long, 1.6-3 mm wide; disc florets 40-70, the corollas yellow-orange, 2 mm diam., the throat 1 mm, the tube 0.5 mm long. Fruits 2.8-4 mm long, the sides with diagonal striations and enlarged margins. Chromosome number n = 12.
More
A herb. It grows each year from seed. The leaves are bright green. They are arranged opposite and are 6-10 cm long by 3-5 cm wide. The edges are irregular. The flowers are small and daisy like and 3 cm across. They occur singly on stalks 2-3 cm long. These are in the axils of leaves.
Home