FLOWERING PLANTS AND FERNS OF ARIZONA 435 



2. Keel not ciliate (5). 



5. Pods commonly 3- or 4-seeded; cotyledons petioled after germination; 

 racemes not or but little surpassing the leaves, even in fruit; herbage 

 villous; stems decumbent or spreading; leaflets usually more than 6, 

 commonly obtuse; lower lip of the calyx 3-dentate; corolla about 7 mm. 

 long, the banner and wings pale purple, the tip of the keel deeper 



purple 4. L. concinnus. 



5. Pods 2-seeded (except sometimes in L. odoratus) ; cotyledons sessile after 

 germination (6). 

 6. Racemes in flower dense, often subcapitate, usually less than 2 cm. long; 

 pods not noticeably constricted between the seeds, ovate or lance- 

 ovate in outline, villous all over (7). 

 7. Plant acaulescent or nearly so, the stems scarcely 1 cm. long, the 

 leaves mostly basal; lower lip of the calyx more than twice as 

 long as the (often obsolete) upper lip; pods broadly ovate. 



5. L. BREVICAULIS. 



7. Plant caulescent, the stems 3 cm. long or longer, branched, leafy; 



lower lip of the calyx less than twice as long as the upper lip, the 

 lips often nearly equal; pods ovate or lance-ovate_ _ 6. L. kingii. 

 6. Racemes in flower loose (if rather dense, then the pods distinctly con- 

 stricted between the seeds), the racemes seldom less than 2 cm. 

 long (8). 



8. Pods lance-oblong in outline, distinctly constricted between the seeds, 



hirsute all over; plants more or less caulescent; stems and the 



lower surface of the leaves hirsute (9) . 

 9. Leaflets obtuse at apex; racemes slightly if at all surpassing the 

 foliage; pedicels hirsute; calyx hirsute all over, the upper lip 4 

 to 5 mm. long 7. L. pusillus. 



9. Leaflets acutish at apex; racemes usually considerably surpassing 



the foliage; pedicels glabrous or nearly so; calyx glabrous or 

 nearly so toward the base, the upper lip not more than 3 mm. 



long 8. L. RUBENS. 



8. Pods ovate in outline, not noticeably constricted between the seeds, 

 smooth or scaly on the sides, villous or hirsute on the upper (ven- 

 tral) suture (10). 



10. Plant loosely pilose, acaulescent or nearly so; racemes 5 to 12 cm. 



long, greatly surpassing the foliage; pedicels and calyx tube 



glabrous or nearly so 9. L. odoratus. 



10. Plant conspicuously silky-villous, more or less caulescent but 

 short-stemmed; racemes usually less than 5 cm. long, not or but 

 slightly surpassing the foliage; pedicels and calyx tube villous. 



10. L. SHOCKLEYI. 



1. Plants perennial, but the young plants sometimes appearing annual, especially 



in L. huachucanus; ovules and seeds normally more than 2 (11). 



11. Petals whitish or ochroleucous; beak of the keel long, attenuate, almost at a 



right angle to the lower part and usually exserted from the wings at 



anthesis, the keel sparsely ciliate toward the base; herbage sparsely 



strigose, appearing glabrous; stems tall, stout, erect; racemes 10 cm. long 



or longer, many-flowered, the flowers large 11. L. latifolius. 



11. Petals normally violet to pale purple; beak of the keel shorter and less 



attenuate, not or barely exserted at anthesis, the keel usually ciliate 



toward the apex (12). 



12. Plant acaulescent and cespitose or, if caulescent, then the stems not more 



than about 20 cm. long; herbage copiously villous-hirsute with long 



spreading hairs; leaflets 5 to 7, acute at both ends; corolla 7 to 9 mm. 



long, the banner and wings violet blue, the tip of the keel purple. 



12. L. HUACHUCANUS. 



12. Plants caulescent, the stems leafy, usually more than 20 cm. long; species 

 difficult to distinguish and apparently largely confluent (13). 

 13. Hairs of the stems and petioles appressed or subappressed (14). 



14. Base of the calyx distinctly short-spurred on one side; herbage 

 commonly densely silvery-sericeous, the leaflets seldom glabrate 



above : _ 13. L. aduncus. 



14. Base of the calyx not spurred but sometimes strongly gibbous on 

 one side (15). 

 15. Banner petal sericeous in the center of the back; flowers S to 9 

 mm. long 14. L. qreenei. 



