Centipeda nidiformis

Decumbent to ascending cottony annual, spreading to c. 15 cm diam. and/or 15 cm high, adventitious roots not or rarely produced; branches densely white-cottony at least on young growth. Leaves more or less spathulate, 3–10 mm long, 1–5 mm wide, usually with very slender petiole-like bases that are often almost as long as (occasionally longer than) the broader part of the lamina, shallowly (often obtusely) toothed or subentire; surfaces light to densely cottony, with (often indistinct) scattered resin droplets. Capitula more or less globular at anthesis, 2.5–5 mm diam., solitary, sessile; involucral bracts obovate with erose membranous margins, 1–1.6 mm long, usually densely cottony; receptacle depressed-hemispherical; female florets c. (50–)110–230, corollas 0.35–0.5 mm long; bisexual florets (6–)9–11, corollas 0.6–0.7 mm long. Fruiting heads readily disintegrating when mature on still-growing plants. Cypselas obcuneate, 0.8–1.1 mm long; ribs 4(–6), with short, subappressed hairs; intervening faces concave with 1 or 2 lines of vesicular trichomes; apex depressed-truncate. Flowers mostly Jan.–Apr.