44 LEGUMINOSiB. 



Peduncle none or very short « 14, 15 



Flowers in pedunculate umbels or whorls. 



Peduncle with a compound or simple bract. 



Bract below the top of the peduncle: stipules large 1, 2, 3 



Bract at the top of the peduncle. 



Stipulate leaves smooth 4, 5 



Stipulate leaves pubescent 1, 6, 7, 8 



Stipules none. Pod with 5 or more seeds 8 to 12 



Pod 1-2-seeded 17, 19, 23 to 25 



Peduncle not bracteate. Stout, erect: pod more than 5-seeded 4 



Slender, prostrate: pod 1-2-seeded 19, 20 



Flowers in nearly or quite sessile umbellate clusters: pod 1-2-seeded. 



Nearly smooth, somewhat woody 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 5 to 20: umbels pedunculate: flowers 6 lines long or longer. 



heel obtuse: erect perennials. 

 + Flowers dull-colored, yellowish and purple. 



1. H. iucana, Torr. Low, stout, densely silky: peduncles about 6 lines long. 



2. H. stipnlaris, Benth. Taller, villous, glandular: peduncles longer. 



3. H. crassifolia, Benth. Erect, tail, nearly or quite glabrous: peduncles long. 



t + Flowers rather showy, larger. 



4. H. bicolor, Dougl. 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. 



t Peduncles long, 1-8-flowered: flowers exceeding 5 lines long: perennials: more or less 



appressed silky: leaflets obovate or narrower, rather acute. 



9. H. grandiflora, Benth. Flowers yellowish or greenish white, rarely purple. 



10. H. rigida, Benth. Petioles short or none: flowers yellow, becoming brown. 



+ t Peduncles 1-5-flowered, about equaling the leaves: flowers less than 6 lines long: yellov) 



in 11, 12; pinkish in 13, I4. 



11. H. znaritima, Nutt. Leaflets fleshy, 4 to 6 lines long, obovate or narrower. 



12. H. strigosa, Nutt, Difi'use, strigose: leaflets linear, rarely ovate, small. 



13. H. parviflora, Benth. Very slender: flowers 2 or 3 lines long, rarely yellow. 

 }4. H. Purshiana, Benth. Widely branching, silky: flowering July to October. 



