1. Commelina L. (dayflower)
Plants annual or perennial, the roots fibrous.
Stems unbranched or more commonly branched. Leaf blades lanceolate to narrowly
ovate, flat above the base. Inflorescences 1 to several, axillary, the flower
clusters subtended by an ovate, strongly folded, spathelike bract that is
shorter than the foliage leaves, and heart-shaped when unfolded. Flowers
zygomorphic. Sepals 3, ovate, more or less equal in shape and size. Petals 3,
the upper 2 larger, obovate to suborbicular, with an expanded portion abruptly
narrowed to a stalklike base, the lower 1 somewhat to much smaller, oblong to
broadly obovate, lacking a narrowed, stalklike portion. Stamens 3, 1 of which
is incurved and has a longer anther than the other 2, the filaments glabrous.
Staminodes 2 or 3, shorter than the fertile stamens. One hundred fifty to 200
species, nearly worldwide, but most diverse in tropical to subtropical regions.