144 FABACEAE 



Stipe 5-7 mm. long; leaflets narrowly linear; stem glabrous or nearly so; 

 calyx-teeth usually nearly equalling the tube. 18. H. stipitatus. 



Legume strigose. 19- H. stngulosus. 



III. Dbbiles. 



Stem very slender, filiform and decumbent; pod sessile, ovate or oval. 



20. if. debilis. 

 Stem erect or ascending; pods stipitate and long-acute at both ends. 



21. H. Bourgovu. 

 IV. Oampestbes. 



Corolla ochroleucous, usually without any tinge of purple; upper leaves reduced to fili- 

 form phyllodes or the rachis greatly produced, without a terminal leaflet; canescent 

 rush-Uke plajits, with deep-seated roots and stem branched below the surface; 

 calyx-lobes less than half as long as the tube. 

 Calyx more or less black-hairy; legumes tapering towards the base. 



Calyx-lobes subulate, much longer than broad; leaves Unear-subulate to hnear, 



very acute. 22. H. campestris. 



Calyx-teeth about as broad as long, triangular; leaflets linear or Unear-oblong, 

 obtuse. 23. H. junciformis. 



Calyx white-hairy; teeth triangular; legumes linear; leaflets, if any, narrowly linear 

 to filiform. 24. H. junceus. 



Coralla white, pink, purplish, or rarely ochroleucous, at least the keel tipped with dark 

 purple; terminal leaflet usually well developed; leafy plants with a cespitose cau- 

 dex. 

 Legume strigose. rarely becoming glabrate in age. 



Legume arcuate. , 



Leaflets S ; plant pulvinate-cespitose. 7. H. deiritahs. 



Leaflets 7-11; plant cespitose, decumbent, but not pulvluate. 



25. H. decumbens. 

 Legume straight, or the end slightly curved upwards in H. oblongifoUus. 

 Leaflets strigose on both sides, usually densely canescent. 

 Leaflets narrowly linear or narrowly lance-linear. 



Calyx-teeth almost as long as the tube; corolla purplish; plant 2— i dm. 



high. 26. H. strigosus. 



Calyx-teeth much shorter than the tube; corolla ochroleucous, only 

 the keel tipped with purple; plant less than 2 dm. high. 



27. H. tenuifoUus. 

 Leaflets narrowly lanceolate or lance-oblong, 4-8 mm. long, 1-2.5 mm. 

 wide; plant less than 1 dm. high. 28. H. divergens. 



Leaflets usually glabrous above, green. 



Calyx white-hairy, its teeth one-tbird as long as the tube; leaflets linear 



to lance-oblong ; racemes long and lax. 29. H. serotinus. 



Calyx usually black-hairy, its teeth fully half as long as the tube. 



Legumes 2-2.5 cm. long; corolla about 1 cm. long; leaflets ample; plant 

 erect, 2—4 dm. high. 

 Leaflets elliptic or oblong, obtuse, the terminal one short-stalked 

 and similar to the rest; lower suture of the legume decidedly 

 curved. 30. H. oblongifoUus. 



Leaflets lanceolate or oblanceolate, somewhat falcate, the terminal 

 one long-stalked, longer and tapering into the rachis without a 

 distinct articulation. 31. H. decurrens. 



Legumes less than 2 cm. long; corolla 6-8 mm. long; leaflets small, less 

 than 1 cm. long; plant decimibent-cespitose, less than 2 dm. 

 high. 

 Leaflets 1-5, the terminal narrowly oblanceolate, falcate, grradually 



tapering into the rachis. 32. H. paudjugus. 



Leaflets 7-17, the terminal one resembUng the rest, short-stalked. 

 Legumes linear with parallel sutures, 3 mm. wide. 



33. H. microcarpus. 

 Legumes obliquely oblanceolate, fully 3.5 mm. wide near the 

 apex. 34. H. humilis. 



Legume glabrous from the beginning. 



Legumes about 1.5 cm. long; calyx-teeth less than half as long as the tube; leaf- 

 lets linear or narrowly lance-lmear. 35. H. Palliseri. 

 Legumes 2-2.5 cm. long; calyx-teeth more than half as long as the tube; leaves 

 lanceolate to oval. 36. H. hylophilus. 

 V. Stenophtlli. 



Calyx-teeth obtuse; leaflets many, the terminal one present. 37. H. stenophyllus. 



Calyx-teeth very acute; leaflets few, the terminal one wanting or continuous with the 

 rachis. 38. H. Episcopus. 



VI. COLIJNI. 



Pod straight. 39. H. collinus. 



Pod curved one-half to two-thirds of a circle. 40. H. curvicarpus. 



VII. Pl/EXUOSI. 

 Pod oblong, over 5 mm. in diameter. 



Inflorescence short; flowers about 15 mm. long: pod glabrous. 41. H. Hallii. 

 Inflorescence elongate and lax; flowers about 10 mm. long; pod pubescent. 



42. H. Fendleri. 

 Pod linear, 2-3 mm. in diameter. 



Pod abruptly contracted into a short or obsolete stipe. 



