New Fl. 4: 45. 1838.

Common names: Silverhead
Etymology: abridged from old Latin name Bulutaparon
Treatment appears in FNA Volume 4. Treatment on page 456. Mentioned on page 406.

Herbs, annual or perennial. Stems procumbent or creeping. Leaves opposite, amplexicaul, sessile; blade linear to narrowly obovate, thick, fleshy, margins entire, glabrous except in axils. Inflorescences solitary, terminal, pedunculate, globose or cylindric heads; bracts and bracteoles chartaceous. Flowers bisexual; tepals 5, distinct; stamens 5; filaments connate basally; anthers 2-locular; pseudostaminodes absent; ovule 1; styles 0.2 mm; stigmas 2–3, subulate. Utricles somewhat compressed, broadly ovoid, coriaceous, indehiscent. Seeds 1, dark brown, orbicular.


Mostly littoral in tropical and subtropical America (including Galápagos Islands), Asia (s Japan), w Africa.


Species 4 (1 in the flora).