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Perennial or annual herb, decumbent or scrambling, often rooting at the nodes, up to 15 cm high or 60 cm long; stems sappy, often reddish or purplish, glabrous or pilose. Leaves ovate, 1-7 cm long, 0.8-5 cm wide, base attenuate, margins dentate, apex acute or obtuse, glabrous or pilose; 3-veined from base; petiole 1-15 mm long, narrowly winged. Capitula solitary and hemispherical, becoming conical, radiate, 4-14 mm long, 4-10 mm in diameter, on stalks 2-7 cm long; involucre 3.5-6 mm long, of 2 series of phyllaries. Ray florets 10-15, yellow, 2.2-3.3 mm long, the ray 1.4-2.3 mm long. Disc florets many, yellow or slightly orange, 1.1-1.9 mm long. Achenes 1.3-2.4 mm long, glabrous; pappus usually absent but sometimes some setae present on achenes of outer florets.
Annual herb, up to 0.4 m high; stems branching from base, creeping and ascending, rooting at nodes, leafy. Leaves opposite, ovate, base truncate to broadly cuneate, apex obtuse, margins entire to serrate-crenate. Capitula axillary and terminal, solitary; involucral bracts linear-lanceolate. Receptacle conical, paleate; paleae boat-shaped, enclosing florets. Ray florets female, fertile; corolla yellow or white, strap-shaped. Disc florets bisexual, fertile; corolla yellow. Anthers obtuse or minutely sagittate at base, with small, obtuse, apical appendage. Style branches of ray florets linear, of disc florets oblong, truncate, minutely penicillate. Pappus absent. Cypselae elliptic, compressed, margins hyaline.
A herb. It can grow each year from seed or keep growing for a few years. It can be scrambling and form roots at the nodes. It grows 15 cm high and 60 cm long. It can be red or purple. The leaves are oval and 1-7 cm long by 1-5 cm wide. There are teeth along the edge. The leaf stalk can be 1.5 cm long and have slight wings. The flowers are yellow or orange.
Creeping and ascending annual herb, up to 300 mm tall. Leaves narrowly to broadly ovate. Heads axillary and terminal, solitary on peduncles up to 50 mm long. Rays very short, inconspicuous. Achenes with hyaline glabrous margins. Flowers with yellow or whitish rays, disc yellow.
