PLANTS: Annual or perennial herbs or small suffrutescent shrubs.
STEMS: not twining but sometimes creeping.
LEAVES: usually small, ovate to almost linear, entire.
INFLORESCENCE: l-several-flowered, axillary, pedunculate cymes.
FLOWERS: sessile or on pedicels about as long as calyx; sepals equal; corolla conspicuous, blue, or inconspicuous, faded pale bluish-white, rotate, funnelform to broadly campanulate, the limb plicate, entire, the lobes pilose externally; stamens with filiform filaments, the anthers ovate to oblong or linear; ovary 1-2-locular, 4-ovulate; styles 2, free or partially united at the base, each style deeply bifid for at least half its length into long, terete, filiform to clavate stigmas.
FRUITS: globose to ovoid, 4-valved.
SEEDS: 1-4, small, smooth or minutely verrucose.
NOTES: Ca. 100 American spp.; mostly tropical. (Latin: evolvo = to unroll). Ooststroom, S. J. van. 1934. Meded. Bot. Mus. Herb. Rijksun., Utrecht 14:1-267.
REFERENCES: Austin, Daniel F. 1998. J. Ariz. - Nev. Acad. Sci. Convolvulaceae 30(2): 61.
Sep 5, ovate to subulate; cor mostly small, funnelform to rotate, entire to 5-lobed; stamens at the top of the short cor-tube; ovary with 2 locules and 4 ovules; styles 2, distinct or barely united at base, each 2-cleft, the fl with 4 linear stigmas; capsule typically 4- valved and 4-seeded, or with fewer seeds by abortion; plants never twining; ours small, hairy perennials with several stems from a thick root, and with small axillary fls usually solitary or occasionally few together at the end of the peduncle. 100, warm reg., mainly Amer.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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