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SE Biology , Vol. 61, No. 1, January, 2014 
3. Perianth segments adaxially lemon yellow; pedicel shorter than 
spathe; spring-summer flowering; sw USA, Mexico. ... H. longifolius 
1. Zephyranthes: Anthers vertical, nearly parallel to filaments, little, if any, 
curving. 
4. Stigma linear 3-fid; mid-winter-summer flowering. 
5. Stamens diverging; perianth tube funnelform, shorter than style. 
6. Perianth white; anthers not exceeding 8 mm in length; mid¬ 
winter-spring flowering; se USA. 
7. Stigma exserted more than 3 mm beyond anthers; perianth 
tube not exceeding 1/3 total perianth length. 
8. Leaf exceeding 4 mm in width; perianth <1/4 total 
perianth length. Z. atamasca 
8. Leaf not exceeding 4 mm in width. 
9. Perianth tube <1/4 total perianth length, tube ca. 1/2 
(1/3-2/3) filament length. Z. atamasca 
9. Perianth tube at least 1/4 total perianth length, tube 
ca. equal (2/3-1 1/4) to filament length. Z. treatiae 
7. Stigma very near, among or below anthers; perianth tube 
length 1/3 or more of total perianth length. Z. simpsonii 
6. Perianth pink; anthers exceeding 10 mm in length; spring- 
summer flowering; introduced, locally naturalized Ala., Fla., La., 
and Tex; endemic to e Mexico. Z. carinata 
5. Stamens fasciculate; perianth tube cylindrical, much longer than 
style; spring-summer flowering; La., Tex., e Mexico; locally 
naturalized Fla. Z. drummondii 
4. Stigma capitate; summer-fall flowering. 
10. Stamens diverging. 
11. Flowers white; introduced from Argentina, locally naturalized se 
USA, Tex. Z. Candida 
11. Flowers yellow. 
12. Perianth tube length less than filament length, tube usually 
under 1 cm long. 
13. Stamens distinctly subequal; introduced, locally 
naturalized Ala., Fla., Miss. Z. citrina 
13. Stamens seemingly equal; Tex., ne Mexico. Z. pulchella 
12. Perianth tube length greater than filament length, tube 
usually over 1 cm long. 
14. Perianth tube ca. 2x filament length; Texas (Goliad & 
Refugio Co.). Z. refugiensis 
14. Perianth tube 3-5x filament length; Texas (Cameron 
Co.). Z. smallii 
10. Stamens fasciculate. 
15. Flowers yellow. 
16. Perianth tube length less than spathe length; Texas 
(Cameron Co.). Z. small ii 
16. Perianth tube length greater than spathe length; Texas 
coastal bend. Z.jonesii 
15. Flowers white. 
17. Stigma exserted more than 3 mm; Tex., e Mexico. .Z. traubii 
