138 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Flowers red or yellow; spurs nearly straight, 2 to 5 cm. long; stamens longer than 
lamine. (RHODANTHAE.) 
Sepals horizontally spreading or reflexed, usually equaling or exceeding the 
spurs. 
Flowers yellow, the sepals occasionally pink....5. A. flavescens. 
Flowers red or pink. 
Base of spur truncate or one side produced into a more or less 
distinct lamina. 
Spurs about 2 cm. long; leaves usually biternate. 
Leaves membranous; sepals light red..8. A. wawawensis. 
Leaves thick; sepals dark red...... 6. A. formosa. 
Spurs about 3 cm. long, slender; leaves triternate. 
7. A. shockleyi. 
Base of spur cut backwards, the laminw obsolete. Leaves tri- 
ternate ....... 2. eee eee eee 9. A. tracyi. 
Sepals slightly spreading or erect, shorter than the spurs. 
Spurs (as also the laminz) yellow; leaflets viscid..10. A. lithophila. 
Spurs red; leaflets various. 
Basal leaves biternate rather than triternate. 
Flowers large, the sepals about three-fourths as long as the spurs; 
eastern species....-................ 11. A. canadensis. 
Flowers small, the sepals about one-half as long as the spurs; 
western species. 
Leaflets not viscid, suborbicular. 
Leaflets green above; sepals light red. 
15. A. elegantula. 
Leaflets glaucous on both surfaces; sepals dark red. 
13. A. desertorum. 
Leaflets viscid, narrow.................14. A. rubicunda. 
Basal leaves distinctly triternate. Southern species. 
Spurs about 3 cm. long; sepals red ........ 12. A. triternata. 
Spurs 4 to 5 cm. long; sepals greenish........ 16. A. skinneri. 
Flowers erect. Spurs slender, straight, usually more than 3.5 cm. long, never red. 
(MACROPLECTRAE, ) 
Spurs not over 8 cm. long. 
Basal leaves once or twice ternate. 
Sepals blue or white. 
Leaflets normal. 
Spurs 5 cm. long or more; leaflets not viscid...18. A. caerulea. 
Spurs about 3 cm. long; leaflets viscid beneath. 
; 20. A. pallens. 
Leaflets thick, small, closely clustered. 
Spurs about 1 cm. long; stems scapose......... 17. A. jonesii. 
Spurs about 4 cm. long; stems bracteate..21. A. scopulorum. 
Sepals yellow. 
Mexico..............000 000000 c eee eee ee 24. A. chaplinei. 
Leaflets medium-sized, glabrate to densely pubescent beneath. 
Alpine in the Sierra Nevada of California. .22. A. pubescens, 
Basal leaves, or some of them, triternate. 
Spurs not more than 2 cm. long or wanting ........ 19. A. ecalcarata. 
Spurs 4 to7 cm. long. Flowers yellow. 
Sepals and petals subequal...................... 24. A. chaplinei. 
Sepals exceeding the petals.................. 23. A. chrysantha. 
Spurs 10 cm. long or more................................ 25. A. longissima. 
