New combinations in Habranthus Herb. (Amaryllidaceae) are made for four species that were previously treated as Zephyranthes Herb. (Z. arenicola Brandegee, Z. chichimeca T. M. Howard & S. Ogden, Z. conzattii Greenm., and Z. longifolia Hemsl.) and that are endemic to Mexico and the southwestern United States: H. arenicola (Brandegee) Flagg, G. Lom. Sm. & Meerow, H. chichimeca (T. M. Howard & S. Ogden) Flagg, G. Lom. Sm. & Meerow, H. conzattii (Greenm.) Flagg, G. Lom. Sm. & Meerow, and H. longifolius (Hemsl.) Flagg, G. Lom. Sm. & Meerow. The mature anthers, which are more or less horizontal and usually lunate or U-shaped, readily distinguish Habranthus from Zephyranthes, in which the mature anthers are vertical and relatively linear.
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Vol. 20 • No. 1