44 LEGUMINOSZ. 
Peduncle none or very short......... ee ae dieisinieisieieinesie'saw Ly LO: 
Flowers in pedunculate umbels or whorls. 
Peduncle with a compound or simple bract. 
Bract below the top of the peduncle: stipules large............. aid-sisiatere 1,2,3 
Bract at the top of the peduncle. 
Stipulate leaves smooth. ......... 2.20 cece ener eee eeere 4,5 
Stipulate leaves pubescent.............- ieee Ges 1, 6, 7,8 
Stipules none. Pod with 5 or more seeds............ 8 to 12 
Pod 1-2-seeded........... 17, 19, 22 to 25 
Peduncle not bracteate, Stout, erect: pod more than 5-seeded...... ware hetoeme 4 
Slender, prostrate: pod 1-2-seeded..... eeceisies «e.-- 19, 20 
Flowers in nearly or quite sessile umbellate clusters: pod 1-2-seeded. 
Nearly smooth, somewhat woody..........0eseeeeeee 16,18 
Very pubescent (silky or tomentose)......... 21, 23, 24, 25 
§ 1. Pod linear, straight or nearly so, 5-20-seeded (2-4- seeded in 15) glabrous or nearly so 
(except in 10 and 16). 
* Leaves with stipules, leaflets & to 20: umbels pedunculate: slowers 6 lines long or longer: 
keel obtuse: erect perennials. 
+ Flowers duil-colored, yellowish and purple. 
1, H. incana, Torr. Low, stout, densely silky: peduncles about 6 lines long. 
2. H. stipularis, Benth. Taller, villous, glandular: peduncles longer. 
3. H. crassifolia, Benth. Erect, tall, nearly or quite glabrous: peduncles long. 
+ + Flowers rather showy, larger. 
4. H. bicolor, Dougi. Glabrous: flowers yellow with whitish wings. 
5. H. gracilis, Benth. Similar: larger flowers with purplish wings. 
6. H. oblongifolia, Benth. Flowers yellow and purple, standard orange. 
Var. angustifolia, Watson. A span high: leaflets narrow: umbels 1-5-flowered. 
7. H. Torreyi, Gr. Silky: standard yellow, wings and keel white. 
8. H. macrantha, Greene. Stipules deciduous: petals yellow standard 6 lines broad. 
* * Stipules reduced to dark, often minute, glands (see No. 8): leaflets 3 to 9 (1 to 3 in No. 
14): claws of petals not exserted. 
+ Peduncles long, 1-8-flowered: flowers exceeding 5 linea long: perennials: more or less 
appressed silky: leaflets obovate or narrower, rather acute. 
9. H. grandiflora, Benth. Fiowers yellowish or greenish white, rarely purple 
10. H. rigida, Benth. Petioles short or none: flowers yellow, becoming brown. 
t+ t Peduncles 1-6-flowered, about equaling the leaves: flowers lesa than 6 lines long: yellow 
in 11, 12; pinkish in 13, 14. 
11. HL maritima, Nutt. Leaflets fleshy, 4 to 6 lines long, obovate or narrower. 
12. H. strigosa, Nutt. Diffuse, strigose: leaflets linear, rarely ovate, small. 
13. H. parviflora, Benth. Very slender: flowers 2 or 3 lines long, rarely yellow. 
144, H. Purshiana, Benth. Widely branching, silky: flowering July to October. 
