136 FABACEAE 



IX. Dastphyua. 

 Flowers reflexed in fruit; bracts minute, truncate and toothed. 



Calyx two-tMrds to three-fourths as long as the corolla, its teeth fully twice as long 



as the tube. 26. T. slenolobum. 



Calyx about half as long as the corolla, its teeth only sUghtly longer than the tube. 

 Banner acuminate; leaflets linear-lanceolate. 27. T. attenuaium. 



Banner obtuse, minutely mucronate; leaflets oblong-lanceolate to elliptic. 



28. T. bracteolatum. 

 Flowers not reflexed in fruit; bracts more conspicuous, lanceolate to subxilate, long- 

 attenuate, except in the first species. 

 Ijcaves as well as the whole plant densely silvery- white. 29. T. anemophilum. 



Leaves green or brown, though somewhat silky. 



Bracts narrow, 1-nerved; leaflets broadest at or below the middle. 



Calyx-teeth only slightly longer than the tube; bracts glabrous, much exceed- 



mg the calyx-tube. 30. T. Hvidum. 



Calyx-teeth fully twice as long as the tube; bracts pubescent, sUghtly if any 

 exceeding the calyx-tube. 

 Banner white or ochroleucous, merely tinged with purple; wings and keel 



dark piurle; pubescence rather loose. 31. T. dasyphyllum. 



Banner as well as the other petals reddish purple; pubescence appressed. 



32. T. scariosum. 

 Bracts broader, 3-nerved ; leaflets broader above the middle. 



33. T. uintense. 

 X. Andina. 



One species. 34. T. andinum. 



XI. Parryana. 

 Banner long-acute, much e.Kceeding the wings; bracts ovate, exceeding the calyx, strongly 



purple-veined. 35. T. salictorum. 



Banner blunt, slightly exceeding the wings. 



Calyx-teeth only sUghtly imequal ; bracts exceeding the calyces ; upper stipules broadly 



obovate. 36. T. Parryi. 



Upper calyx- teeth much shorter than the lower; bracts not exceeding the calyces; 

 upper stipules ovate. 

 Peduncles 1-2 dm. long; bracts ovate. 37. T. inaequaU. 



Peduncles less than 1 dm. long; bracts obovate in outline. 38. T. montanense. 



XII. INVOLUCRATA. 



Perennials. 



Banner white; wings and keel tipped with dark purple; calyx-teeth twice £is long as 



the tube. 39. T. spinulosum. 



Banner as well as the other petals purple; calyx-teeth a little longer than the tube. 

 Corolla 12-15 mm. long; involucres to about the middle. 40. T. Fendleri. 

 Corolla about 10 mm. long ; involucres cleft to below the middle. 



41. T. oxydon. 

 Annuals. 



Involucres much shorter than the flowers, not scarious; teeth long. 

 Leaflets obovate or elUptic. 



Flowers 7-8 mm. long. 42. T. variegatum. 



Flowers more than 1 cm. long. 43. T. subsalinum. 



Leaflets Unear. 44. T. oliganthum. 



Involucres almost equaUing the flowers, scarious at least below, its teeth short or 

 none. 

 Involucres glabrous, 8-10 mm. high, its lobes toothed; calyx-teeth temately 



divided, with setiform branches. 45. T. cyanthiferum. 



Involucres hairy, 5-7 mm. high, its lobes entire; calyx-teeth simple. 



46. T. micTocephalum. 

 XIII. Agraeia. 

 One species. 47. T. procumbens. 



6. MEDICAGO (Tourn.) L. Mbdick, Alfalfa, Lucerne, Nonesuch. 

 Pod unarmed. 



Perennial, erect; corolla violet or blue; fruit spirally coiled in 2-3 turns. 



1. M. sativa. 



Annual, prostrate; corolla yellow; frmt merely curved. 2. M. lupulina. 



Pod prickly, densely spirally coiled, in 2-3 turns; corolla yellow. 3. M. hispida. 



6. MELILOTUS (Tourn.) HiU. Sweet Clover, Honey Clover. 

 Corolla white; baimer a Uttle longer than the wings. 1. M. alba. 

 Corolla yellow; banner about equalling the wings. 2. M. officinalis. 



7. LOTUS (Tourn.) L. Bird's-foot Trefoil. i. l. tenuis. 



8. ACMiSPON Raf. 



Leaves subsessile; petiolule of the terminal leaflet ascending. 1. A. americanus 



Leaves distinctly petioled; petiolule of the terminal leaflet reflexed, or at least spreading. 



2. A. elatus. 



9. HOSACKIA Dougl. Bird's-foot. i h Hcoior 



