682 Rypperc: STUDIES ON THE Rocky MounTAIN FLoRA 
his Exotic Flora, pl. 193 & 194, identifies Colignon’s plant as 
Abronia umbellata. The type of 7ricratus is the same, and that of 
Cycloptera is A. cycloptera. 
Fruit narrowly winged or crested ; wings or crests not completely encircling the fruit. 
Fruit biturbinate, z. ¢., tapering at both ends, irregularly ridged or crested. 
Flowers about 2 cm. long ; limb 5-10 mm, wide. 
Bracts broadly obovate, over I cm. long. 1. A. fragrans. 
Bracts ovate-lanceolate, less than I cm. long. 2. A. nudata. 
Flowers about 1 cm. long ; limb 3-5 mm. wide; bracts ovate to lanceolate- 
ovate, about 5 mm. long. 
Petioles of the stem-leaves shorter than the very thick blades ; plant low, 
about 1 dm. high. : 3. A. pumila. 
Petioles of the stem-leaves much longer than the moderately thick blades ; 
plant slender, 2-4 dm. high. 4. A. ammophila. 
Fruit turbinate or obpyramidal, 7. ¢., almost truncate above, distinctly winged ; the 
wings very broad above. 
Plant almost acaulescent ; stem and leaves greatly surpassed by the long 
peduncles. 5. A. nana. 
Plant with an elongated stem. 
Bracts broadly ovate or obovate, acute or obtusish. 
Stem distinctly viscid-pubescent ; leaves scabrous-puberulent ; bracts 
I-1,5 cm. long. 
Blades of the stem-leaves elliptic; bracts broadly obovate, 12- 
I5 mm. wide, obtusish. 6. A. salsa. 
Blades of the stem-leaves lanceolate; bracts oval, acute, about 
6-7 mm. wide. 7. A. fallax. 
Stem finely puberulent or glabrous ; leaves glabrous ; bracts 5-8 mm. 
long. 
Stem puberulent. 8. A. elliptica. 
Stem glabrous. g. A. glabra. 
Bracts oblong-lanceolate or lanceolate, attenuate or cuspidate. 
Stem glabrous. 10. A. lanceolata. 
Stem more or less pubescent. 
Stem puberulent ; wings with double lamina, coriaceous. 
11. A. Carletont. 
Stem villous ; wings with single lamina, membranous. 
; 12. A. villosa. 
Fruit completely surrounded by the broad netted-veined membranous wings. 
Flowers 3 cm. or more long ; limb about 1 cm. wide ; peduncles longer than the 
leaves. 43. ve cycloptera. 
Flowers 1.5~2 cm. long; limb about 5 mm. wide. 
Stem glabrous or nearly so ; peduncles often nearly equalling the leaves. 
14. A. pedunculata. 
Stem densely pubescent ; peduncles at least in flower much shorter than the 
leaves. 15. 4. micrantha. 
1. ABRONIA FRAGRANS Nutt.; Hook. Kew Journ. 5: 261. 1853 
_ On the plains from South Dakota to Montana, Idaho, New 
_ Mexico and Kansas. : 
