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By and large, species with linear stigmatic lobes bloom mid winter–spring–summer, while those with capitate stigmas bloom summer–fall. While there is considerable diversity within Zephyranthes, splitting the genus into two genera by the degree of fusion of the perianth tube does not fit well with the continuity of the morphological spectrum and with the apparent hybrid origins of species in Texas and Mexico. The species with long perianth tubes and fasciculate stamens are sometimes segregated in the genus Cooperia. The phylogeny of Zephyranthes is not well understood. The timing of the opening of the bud and the expansion of the flower runs across this morphological spectrum from early morning (shortest tubes) through the day to the evening (longest tubes). The longer the perianth tube, the less the stamens diverge, to the point of fasciculation. The more the perianth is fused, the shorter the filaments in relative length. Flowers with much-abbreviated perianth tubes are subrotate with increasing degrees of perianth fusion, flower form shifts from subrotate to funnelform to salverform. In Zephyranthes, the degree of fusion of the perianth into a tube is reflected in flower form, filament length, staminal position, and the opening of the bud. 70 (16 in the flora): se and sc United States, Mexico, West Indies, Central America, South America. Seeds numerous, black, flat, D- or wedge-shaped, lustrous.

Fruits capsular, thin-walled, 3-locular, subglobose or ± oblate. longifolia) filaments inserted just above perianth tube, erect, diverging except when shorter than tube, long-filiform to short-subulate, those inserted on distal tepals usually 1+ mm longer than those inserted on proximal ones anthers submedially dorsifixed, usually parallel with floral axis, linear-oblong ovary inferior style filiform stigma capitate or 3-fid with lobes linear pedicel sometimes absent, hollow.

Flowers erect to declinate, actinomorphic perianth subrotate to funnelform to salverform, connate basally into tube, 2–16 cm tepals subequal stamens 6, of 2 different lengths, appearing equal or subequal (anthers in 2 overlapping sets of 3) to unequal (anthers of the sets not overlapping in Z. drummondii), spathaceous, otherwise ebracteate spathe proximally tubular. Inflorescence 1-flowered (rarely 2-flowered in Z. Leaves sessile, erect or recumbent, with overlapping sheathing bases blade linear, rarely exceeding 1 cm wide, smooth. Bulbs black or brown, tunicate, ovoid or globose, sometimes with long neck. Flory†Ītamosco Adanson 1763, name rejected Cooperia Herbert

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