Botanical name: Spermacoce exilis    Family: Rubiaceae (Coffee family)
Synonyms: Borreria exilis, Borreria gracilis, Spermacoce mauritiana, Borreria repens

Pacific Buttonweed is a spreading or erect herbs; stem 4-angled and narrowly winged, fringed with hairs along the margins. Leaves 1-2.7 x 0.4-1.3 cm, ovate to elliptic, base wedge-shaped, tip pointed, hairless, nearly stalkless; stipule bristles subulate. Flowers very small, in in leaf-axils and at branch-ends, stalkless, capitate clusters. Bracts and bracteoles subulate. Sepals 2, 1-2 mm long, lanceshaped. Flower white, about 2 mm long. Capsule about 1 mm long, flat, compressed, velvet-hairy. Seeds oblong, netveined. Pacific Buttonweed is believed to be a native of South America, now naturalized in Tropical Asia and Africa. Flowering: September-October.

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The flower labeled Pacific Buttonweed is ...