PEA FAMILY 145 



stem decumbent; stipe minute or obsolete. 43. H. flexuosus. 



Stem erect; stipe almost equalling the calyx. 44. H. proximus. 



Pod gradually tapering into the short stipe. 45. H. Salidae. 



VIII. Macrocarpi. 

 One species. 46. H. macrocarpus. 



35. KENTROPHYTA Nutt. 



Stipules united only at the base, more or less herbaceous. 



Plant 3-4 dm. high, usually erect; stipules lanceolate, with long spinulose tips. 



1. K. impensa. 

 Plant low; stipules lance-subulate, not spinulose-tipped. 2. K. viridis. 



Stipules united for about half their length, scarious. 



Leaflets hnear-fihform, scarcely narrowed at the base; corolla ochroleucous, sub- 

 sessile in the axils of the leaves. 3. K. montana. 

 Leaflets lanceolate or oblanceolate, distinctly narrowed at the base. 



Corolla ochroleucou.s, about 4 mm. long, the keel usually purple-tipped; leaflets 



less than 5 mm. long. 



Flower-clusters subsessile or short-peduncled ; calyx-lobes shorter than the 



tube. 



Leaves short-hairy; stipules with long spreading tips; leaflets about 3 mm. 



long. 4. K. minima. 



Leaflets long-hairy; stipules not with spreading tips; leaflets 4-5 mm. long. 



5. K. Wolfii. 

 Flower-clusters on peduncles much exceeding the leaves; calyx-lobes equalling 

 or exceeding the tube. 6. K. tegetaria. 



Corolla purple, about 6 mm. long; leaflets over 5 mm. long. 7. K. aculeala. 



36. OROPHACA (T. & G.) Britton. 



Flowers sessile in the axils of the leaves, 12 mm. or more long; corolla ochroleucous; 

 calyx-tube longer than the teeth; plant pulvinate-cespitose. 

 Corolla 2 cm. or more long, glabrous; calyx-tube cylindrical, more than thrice as 



long as the teeth. 1. O. caespitosa. 



Corolla 15-18 mm. long, pubescent on the outside; calyx-tube short-cylindric, about 

 twice as long as the teeth. 2. O. argophylla. 



Flowers in small, neduncled 1-3-flowered racemes, purple or turning yellowish in age, 

 less than 10 mm. long; calyx-tube campanulate, not longer than the tube-teeth. 

 Plant pulvinate-cespitose; flowers 8-10 mm. long; inflorescence not exceeding the 

 leaves. 

 Flowers about 10 mm. long; pods puberulent. 3. O. tridactylica. 



Flowers about 8 mm. long; pods hoary. 4. O. aretioides. 



Plant broadly cespitose, with prostrate branches; flowers about 6 mm. long; ped- 

 uncles usually exceeding the leaves; pods hoary. 5. O. sericea. 



37. ARAGALLUS Necker. Loco-weed. 



stipules adnate to the petioles only slightly at the base; pods pendent, 1-celled, many 



times exceeding the calyx; plant often caulescent. I. Deflexi. 



Stipules decidedly adnate to the petioles; pods not pendent; plant acaulescent. 

 Leaves strictly piimate; leaflets opposite. 



Fruiting calyx inflated, enclosing the fruit; plants densely cespitose, less than 



1.5 dm. liigh. II. Naxi. 



Fraiting calyx not inflated, much exceeded by the pod. 

 Inflorescence 1-3-flowered; plants dwarf, pulvinate. 



Pods inflated, 1-celled, ovoid. III. Inflati. 



Pods not inflated, oblong, almost 2-celled. IV. P.\rry.\ni. 



Inflorescence many-flowered; plants mostly over 1.5 dm. high, not pulvinate; 

 pod oblong, not inflated. V. C.^mpestre^. 



Leaflets verticillate. VI. Verticill.\re3. 



I. Deflexi. 

 Plant more or less caulescent; racemes at least in fruit elongate; pods 1.5-1.8 cm. long. 



1. A. deflexus. 

 Plant subacaulescent ; racemes short and head-like; pods about 1 cm. long. 



2. A. foliolosus. 

 II. Naxi. 



Peduncles scarcely exceeding the leaves, 1-3-flowered; bracts broadly ovate. 



Leaflets 5-10 mm. long; corolla 20-25 mm. long. 3. A. muUiceps. 



Leaflets 3-6 mm. long; corolla about 15 mm. long. 4. A. minor. 



Peduncles decidedly exceeding the leaves, many-flowered; bracts lanceolate or ovate- 

 lanceolate. 

 Pubescence of the peduncles appressed or merely ascending; pods included in the 

 calyx. 

 Peduncles erect, strict; spike oblong, ovei 2 cm. long. 



Corolla yellow or whitish, more than 2 cm. long. 5. A. coUinus. 



Corolla purple, less than 2 cm. long. 6. A. Blankinshipii. 



Peduncles ascending, curved; spike subcapitate. 7. A. nanus. 



Pubescence of the peduncles loosely spreading; pods usually somewhat exserted. 



8. A. Lagopus. 



III. INFLATI. 



Leaflets 11-23. 



Leaflets sparingly appressed-hirsute. 9. A. podocarpus. 



