3(2). Pedicels erect or ascending; perianth 8-12 mm. long; anthers 2-3 mm. 

 long 1. S. longipes. 



3. Pedicels spreading or recurved; perianth 3-5 mm. long; anthers 0.5-1.5 mm. 



long 2. S. cernuum. 



4(2). Ovaries and capsules 1.5 times as long as broad 3. S. minus. 



4. Ovaries and capsules subglobose to broadly oblong (5) 



5(4). Flower variously colored, not yellow; tepals 9-16 mm. long; capsules 

 3-4.2 mm. wide 4. 5. rosulatum. 



5. Flowers yellow with red-brown eye ring; tepals 5-10 mm. long; capsules 



2.7-3.5 mm. wide 5. 5. exile. 



6(1). Stems without leafy bracts (7) 



6. Stems with leafy bracts (10) 



7(6). Spathes dry and brown, often tinged violet 6. S. sagittiferum. 



7. Spathes dark-green to yellow-green, sometimes purple at nodes (8) 



8(7). Floral bracts about the same length 11. S. biforme. 



8. Outer floral bract much longer than the inner (9) 



9(8). Plants of central and south Texas, drying olive-green 



12. S. dimorphum. 



9. Plants of north Texas, drying light-green 7. S. montanum. 



10(6). Stems broadly winged with each wing as broad as the stem and at least 

 1 mm. wide 8. 5. angustifolium. 



10. Stems not broadly winged (11) 



11(10). Plants very erect; stems 5 to 7 times as long as the peduncles 



9. S. atlanticiim. 



11. Plants spreading to erect; stems shorter to 3 times as long as the peduncles 



(12) 



12(11). Spathes dry and brown, usually tinged violet 6. S. sagittiferum. 



12. Spathes green, sometimes purple at nodes (13) 



13(12). Pedicels 6-11 mm. longer than the spathes; capsules upright; plants 

 erect; stems few or solitary 10. S. demissum. 



13. Pedicels shorter, to 4-5 (-10) mm. longer than the spathes; capsules spread- 



ing to pendent; plants spreading to erect; stems often numerous (14) 



14(13). Mature capsules broadly oblong, 5-7 mm. high; tepals 7-13 mm. long; 

 wings and stems drying about the same color 11. S. biforme. 



14. Capsules globose to subglobose, 4-5 mm. high; tepals 5-8 mm. long; wings 



drying dark, the stems light 12. 5. dimorphum. 



1. Sisyrinchium longipes (Bickn.) Kearn. & Peeb. 



Plants 1.5-3 dm. tall, dull green and glaucescent; leaves about half the height 

 of the plant; flowers several on pedicels much-exserted from bracts; tepals 8-12 

 mm. long, orange-yellow with orange or brownish veins; capsules broadly oblong 

 to oblong-obovoid, 5-7 mm. high, 4-5 mm. wide, erect and contiguous. 



In springy places and open spruce and pine woods in Ariz. (Apache, Cochise, 

 Coconino, Graham and Pima cos.), July-Sept.; also n. Mex. 



2. Sisyrinchium cernuum (Bickn.) Kearn. 



Plants in small tufts 7-18 cm. tall, dull green and glaucescent, from a cluster 

 of delicate roots; leaves equal to or shorter than the stems; flowers small; tepals 

 3-5 mm. long, yellow, obtuse, dark-lineate; capsules subglobose to somewhat 

 pyriform, 3-5 mm. high, nodding on slender recurved pedicels that are exserted 

 from the bracts. 



Along a stream in Ariz. (Cochise Co.), Mar.; also Mex. 



674 



