136 FABACEAE 



IX. Dasyphylla. 



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



Caly.x two-thirds to three-fourths as long as the corolla, its teeth fully twice as long 



as the tube. 26. T. stenolobum. 



Calv.ic about half as long as the corolla, its teeth only slightly longer than the tube. 

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



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



28. T. brarteolatum. 

 Flowers not reflexed in fruit; bracts more conspiciious, lanceolate to subulate, long- 

 attenuate, except in the first species. 

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



Leaves green or brown, though somewhat sUky. 



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



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

 ing the calyx-tube. 30. T. lividum. 

 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 piu-ple; wings and keel 



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



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



32. T. scariosuin. 

 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 exceeding the wings ; bracts ovate, exceeding the calyx, strongly 



purple-veined. 33. T. salictorum. 



Banner bhmt, shghtly exceeding the wings. 



Calyx-teeth only shghtly unequal; 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. inaequale. 



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



XII. lNVOLUCR.\TA. 



Perennials. 



Banner white; wings and keel tipped with dark purple; calyx-teeth twice as 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. 

 CoroUa 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 elhptic. 



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



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



Leaflets Unear. 44. T. oliganthum. 



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

 none. 

 Involucres glabrous, 8-10 mm. liigh, its lobes toothed; calyx-teeth ternately 



divided, with setiforra branches. 45. T. cyanlhiferum. 



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



46. T. microcephalum. 



XIII. Agraria. 

 One species. 47. T. procumbens. 



5. MEDICAGO (Tourn.) L. Medick, Alfalfa, Lucerne, Nonesuch. 



Pod unarmed. 



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



1. M. satira. 



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



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



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

 Corolla wMte; banner a little 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. bicolor. 



