PEA FA:vnLY 509 



Legumes decidedly flattened laterally. 



Leaves simple or some of them rarely 3-foliolate: plants pulvinate-cespitose; pod 

 sessile. I. Seviplicifolii. 



Leaves several-foliolate. 



Pod sessile or short-stipitate; stipe seldom exceeding the calj"x. 

 Legume ovai, ovate, broadly oblong, or eiiiptic. 



Pod without long black hairs. IL Texelli. 



Pod with long black hairs. III. Debiles. 



Legume Unear, 1.5 cm. long or longer. IV. C.vmpesthes. 



Pod long-stipitate; stipe decidedly longer than the calj-x. 



Calyx not gibbous at the base, less than half as long as the corolla ; pod mem- 

 branous; leaflets Unear or filiform. V. Stexophtlli. 

 Ca yx strongly gibbous at the base, more than half as long as the corolla; pod 

 more coriaceous. VI. Collixi. 

 Legumes nearly terete. 



Pod sessile or short-stipitate; stipe if any shorter than the calyx. 



VII. Flexuosi. 

 Pod long-stipitate; stipe longer than the calyx. VIII. M.\crocarpi. 



I. SmpLiciroLn. 



Calyx-teeth about half longer than the calyx-tube; corolla ochroleucous or whitish. 

 Calyx glabroiLs. 1. H. ligulalus. 



Calyx pubescent. 



Leaves almost filiform, sparingly hairy, pxmgent-pointed ; pods mottled. 



2. H. eiilifolius. 

 Leaves narrowly linear-oblanceolate, canescent, not pvmgent; pods not mottled. 



3. H. simplicifolius. 

 Calyx-teeth about as long as the tube; coroUa purple or pink. 



Pedimcles l-flowered; bracts subulate, longer than the flowers. 4. H. uniflorus. 

 Peduncles 3-10-flowered; bracts ovate to narrowly lanceolate, shorter than the flow- 

 ers. 

 Pods long-acute; bracts narrowly lanceolate; leaves usually narrowly oblanceolate. 



5. H. caespitosus. 

 Pods abruptly acute; bracts short, ovate to lanceolate, very scarious; leaves 

 oblanceolate or spatulate. 6. H. brachycarpus. 



II. Tex-elli. 

 Pod strictly sessile 



Leaflet's narrowly linear, often wanting. 8. H. lancelarius. 



Leaflets oblong to oval. 



Stems densely cespitose, 1-2 dm. high; racemes short, few-flowered. 



Racemes 2-6-flowered, shorter th?n the leaves; leaflets oblong to oblanceolate, 



acute, canescent. 9. if. texilliflezus. 



Racemes 5-12-flowered, exceeding the leaves; leaflets oblong to eUiptic, green, 

 glabrate above. 10. H. miser. 



Stems more simple, 2 dm. high or more; racemes elongate. 



Pods erect, on long pedicels. 11. H. grallator. 



Pods spreading or reflexed, on short pedicels. 



Pods glabrous; plant canescent. 12. H. wingatanus. 



Pods hairj ; plant green. 13. H. Clemeniis. 



Pod short-stipitate. 



Corolla white, tinged with purple. 



Both suttires of the pod curved. 14. H. acerbus. 



Lower suture of the pod straight. 15. H. Dodgeanus. 



CoroUa ochroleucous. 

 Legume glabrous. 



Stipe rarely exceeding the tube of the calyx; leaves ustiaUy spreading in age; 



leaflets oblong to oval, obtuse and mucronate. 16. H. dispar. 



Stipe of the mature legume usuaUy exceeding the caly.x-teeth; leaves strongly 

 ascending; leaflets narrowly Unear to linear-oblong, mostly acute. 

 Stipe 3-4 mm. long; leaflets Unear or Unear-oblong ; stem usuaUy conspicu- 

 ously strigose; calyx- teeth half as long as the tube. 



17. H. tenellus. 

 Stipe 5-7 mm. long; leaflets narrowly Unear; st«m glabrous or nearly so; 

 calj-x-teeth usually nearly equaUing the tube. 18. H. stipitatus. 



Legume strigose. 19. H. strigulosus. 



III. Debiles. 



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



20. H. debilis. 

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



21. H. Bourgovii. 



IV. C.VMPESTRES. 



CoroUa ochroleucous, usuaUy without any tinge of purple; upper leaves reduced to fiU- 

 )■■ formphyUodes or the rachis greatly produced, without a terminal leaflet; canescent 



^H rush-Uke plants, with deep-seated roots and stem branched below the stirface; 



V calj-x-lobes less than half as long as the tube. 



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



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

 very jicute. 22. H. campestris. 



