250 LEGUMINOSAE 



II. Plants annual or biennial. 

 1. Flowers in whorls. 

 Keel ciliato on upper margin between middle and apex, or (rarely) non-ciliate; flowers ly^ to 6 

 lines long ; corolla bicolored, blue, the banner with a white or yellow center usually turn- 

 ing violet or purple ; leaflets pubescent on upper surface, or at least slightly pubescent 

 usually. 

 Keel slender with long narrow point Cacumen). 

 Banner suborbicular or broader than long. 



Keel non-ciliate; flowers 3 to 4 lines long; pedicels 1 to 1% lines long; pods con- 

 spicuously broad, 3 to 4M; lines wide, 1 to 1% inches long 



32. L. pnchylobus. 

 Keel ciliate; flowers mostly 5 to 6 lines long; pedicels 1% to 4 lines long; pods 



usually not conspicuously broad, 2% to 3 lines wide, % to 2 inches long 



33. L. nanus. 

 Banner obovate-orbicular to elliptical, longer than wide; keel ciliate (or rarely non- 

 ciliate) ; flowers 2 to 4 lines long; pods 5 to 12 lines long, 1% to 3 lines wide 



34. L. bicolor. 

 Keel blunt, ciliate; banner cuneate to spatulate; flowers 1^/^ to 3 lines long; pods 10 to 13 



lines long, 2^2 to 3 lines wide 35. L. micranthus. 



Keel ciliate on both upper and lower margins near the claw only; flowers 4% to 8^^ lines long; 

 pods about 2 inches long; leaflets glabrous above 36. L. succulentus. 



2. Flowers not in whorls. 



Eacemes longer than peduncles; pods usually pubescent, constricted between the seeds. 



Keel non-ciliate; racemes nearly sessile, usually exceeded by the foliage; flowers usually 3Va 

 to 4% (rarely 6) lines long; pods ascending, 2 to 4-seeded; plants densely pu- 

 bescent 37. L. concinnus. 



Keel usually ciliate on lower margin near the claw, commonly also ciliate on upper margin 

 near the claAv (rarely non-ciliate) ; pods 2 to 8-seeded; seeds smooth. 

 Plants conspicuously and densely hispid with long yellow or bro\\Ti stinging hairs; 



largest leaflets 7 to 12 lines wide 38. L. hirsiitissimus. 



Plants not conspicuously hispid, the hairs shorter, not stinging; leaflets 1 to 6 lines wide. 



Keel stout and blunt, always densely ciliate on most of upper margin, more or less 



ciliate on lower margin near the claw; leaflets linear-cuneate, truncate, 



2 or 3-toothed at the apex; petioles flattened 39. L. truncatus. 



Keel with slender acumen, sparsely ciliate or non-ciliate on upper margin, ciliate 

 or (rarely) non-ciliate on lower margin near claw; leaflets filiform or 

 broader; petioles not flattened. 

 Pods ascending, pubescent; petals blue to purple. 



Leaflets linear-filiform, usually 1^/4 to 2 inches long; bracts linear, dense 

 and densely hairy, the raceme in bud forming a conspicuous 

 plume; keel very slender, falcate, always non-ciliate on upper 



margin 40. L. hentliamii. 



Leaflets linear or broader, % to 1 inch long; bracts not conspicuous on 

 young racemes ; keel broader, not falcate, ciliate or non-ciliate on 



either margin 41. L. sparsiflorus. 



Pods deflexed, becommg glabrate ; petals orange or white, keel ciliate on lower 



margin only; pods 2 to 4-seeded 4^2. L. citrinus. 



Eacemes shorter than peduncles, few-flowered, siibcapitate in early anthesis ; flowers 7 to 8 lines 

 long ; banner yellow, wrings rose-pink ; keel densely ciliate near the claw on both upper 

 and lower margins; pods ascending, glabrous 43. L. stiversii. 



B. Cotyledons sessile, connate; ovules usually 2 only; annuals. 

 I. Flowers in whorls ; keel more or less ciliate. 



Leaflets glabrous above ; stem not rigid, often hollow ; petals white, yellow, pink or purple 



44. L. microcarpus. 

 Leaflets pubescent on both sides; stem rigid, never hollow; petals yellow 45. L. luteolus. 



II. Flowers not whorled; keel nox-ciliate; stems very short (mostly ^4 to 1 or rarely 



314 INCHES long), the LEAVES AND PEDUNCLES THEREFORE BASAL OR SUB-BASAL. 



Pods hairy on the margins, the sides quite glabrous or nearly so. 



Eacemes shorter than the leaves ; calyx hairy, its lips subequal ; pods minutely scaly on the 



sides; leaflets silky beneath, glabrous above 4:6. L. sfioclcleyi. 



Eacemes conspicuously exceeding the leaves; calyx glabrous (except in vars.), the lips un- 

 equal; pods smooth or scaly on the sides; leaflets glabrous or nearly so 



47. L. odoraius. 



