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FNA | Family List | FNA Vol. 6 | Cucurbitaceae | Sicyosperma

1. Sicyosperma gracile A. Gray, Smithsonian Contr. Knowl. 5(6): 62. 1853.

Leaf blades 2–7 cm wide, lobe apex rounded to acute. Inflorescences: each flower loosely enclosed within 2 bracts; peduncle hispid, hairs retrorsely curved. Flowers: petals apically 2-fid, corolla 2–3 mm diam. Pepos 4–5 mm, loosely enclosed by persistent bracts.

Flowering Aug–Oct(–Nov). North slopes, cliff bases, canyon bottoms, stream sides, riparian scrub, willow-ash, cottonwood-willow, hackberry-acacia, oak woodlands; 1000–1700 m; Ariz., N.Mex.; Mexico (Chihuahua, Sonora).

Sicyosperma gracile is recognized by its annual duration, minute salverform corollas with white, apically bifid petals, each flower enclosed within a pair of basally cordate bracts, and relatively small, 1-seeded, dry, indehiscent, unarmed pepos loosely enclosed by bracts. Specimens sometimes show only staminate inflorescences, but apparently this is an artifact of collection rather than an indication that the plant is unisexual.


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