484 FABACEAE 



Upper calyx-lip cleft to middle or bifid. 



Without long-petioled leaves at flowering time. L. Seeicei. 



With some long-petioled leaves at flowering time. 



Flowers crowded in dense racemes, mostly spicate or capitate. H. Caespitosi. 



Flowers scattered or in verticils in rather loose racemes. 



Leaves largely basal, stem-leaves few. R. Magnifici. 



Stems well developed and with many leaves. 



Dwarf plants less than 2 dm. tall, commonly shrubby and matted. 



J. Breweriani. 



Plants usually over 3 dm. tall, often much-branched shrubs. 



L. Sericei. 



A. MlCROCARPI. 

 Flowers ascending to suberect in anthesis. 



Banner 7-11 mm. wide, rounded at apex; both wing and keel petals ciliate near claws on both upper and 

 lower edges. L L - horizontals. 



Banner 4-6 mm. wide, angled at apex; neither wing nor keel petals ciliate on lower edges. 



2. L. microcarpus. 



Flowers spreading in anthesis. 



Flowers becoming suberect soon after anthesis, usually not secund. 3. L. subvexxts. 

 Flowers spreading or distinctly secund after anthesis. 



Stems often fistulous; banner elliptic or oval, rarely ovate; keel sparsely ciliate or non-ciliate below, 



near claw; seeds smooth or roughened, but not tuberculate. 4. L. densiflorns. 

 Stems never fistulous; banner ovate; keel densely ciliate below as well as above, near claws; seeds uni- 

 formly dark brown and tuberculate. 5. L. lutcolus. 



B. PUSILLI. 

 Pods lance-oblong, hirsute, constricted between the seeds; peduncles very short, the racemes equaled or surpassed 



by the foliage; seeds lenticular. 10. L. pusillus. 



Pods oblong or ovate, scarcely constricted between the seeds; peduncles well developed; seeds more or less oblong. 

 Pods oblong, about 20 mm. long, smooth or scaly on the sides; ovules 2-6. 9. L. odoratus. 



Pods ovate, or not over 15 mm. long; ovules 2. 



Banner suborbicular; racemes elongated; pods loosely villous on the sides. 7. L. rubens. 



Banner longer than wide. 



Stems and petioles loosely villous; racemes usually subcapitate; pods loosely villous on the sides. 



6. L. brevicatihs. 



Stems and petioles short- velvety; racemes elongated and flowers scattered; pods smooth or scaly on 

 the sides. 8. L. Shockleyi. 



C. CONCINNI. 

 One species. 11- L. concinnus. 



D. Stiversiani. 



One species. 12 - £■ Stiver sii. 



E. SUCCULENTI. 



One species. 13. L. succulentus. 



F. Sparsiflori. 



Largest leaflets 15-25 mm. wide; plants with stinging hairs 2-5 mm. long. 14. L. hirsutissimus. 



Largest leaflets 2-12 mm. wide; longest hairs not over 2 mm. long. 



Keel stout, with short, blunt acumen, woolly-ciliate on the upper margins. 15. L. truncatus. 



Keel with slender, acute acumen. 



Matured pods ascending; petals blue, lilac or purple. 



Pedicels 5-9 mm. long; floral bracts much exceeding the buds, usually early deciduous. 



16. L. Benthamu. 



Pedicels 2-4 mm. long; bracts not greatly exceeding the buds, often subpersistent. 



17. L. sparsiflorus. 

 Matured pods deflexed; petals neither blue nor purple. 



Plants 2-4 dm. tall; petals white or pinkish; pods five- to eight-seeded. 18. L. deflexus. 

 Plants 1-2 dm. tall; petals orange or golden; pods two- to four-seeded. 19. L. citrinus. 



G. MlCRANTHI. 



Pedicels 3-8 mm. long; flowers 8-16 mm. long; banner suborbicular or wider than long; verticils four to several. 



20. L. nanus. 

 Pedicels 1-3 mm. long. 



Banner cuneate or spatulate; keel short and broad, the blunt acumen scarcely upturned. 



23. L. micranthus. 



Banner neither cuneate nor spatulate; keel slender, with the long, narrow acumen often much upturned. 



Pods 6-9 mm. wide; seeds 4-5 mm. long by fully 3 mm. wide. 21. L. pachylobus. 



Pods 3-5 mm. wide; seeds 2-3 mm. long by about 2 mm. wide. 22. L. bicolor. 



H. Caespitosi. 



Racemes capitate or subcapitate, rarely more than twice as long as wide; peduncles often curved or bent, spread- 

 ing or decumbent; stems often woody near base. 24. L. Lyallii. 

 Racemes cylindrical or conoidal, usually more than twice as long as wide. 



Banner suborbicular, about as wide as long; peduncles shorter than the elongated, leafy stems. 



29. L. hypolasius. 



Banner usually longer than wide. 



Peduncles very short, the racemes subsessile and surpassed by the foliage. 25. L. caespitosus. 



Peduncles well developed, the racemes equaling cr surpassing the foliage. 



Stems poorly developed, few-leaved; flowers 6-9 mm. long, mostly crowded in the raceme. 



26. L. aridus. 

 Stems well developed, many-leaved. 



Largest leaflets usually under 30 mm. long, silky above. 27. L. Icpidus. 



Largest leaflets usually over 30 mm. long (3-8 cm.), greenish, subsericeous to glabrate above. 



28. L. pratensis. 



