PEA FAMILY 509 



Legumes decidedly flattened laterally. 



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

 sessile. I. Si.vipucifoui. 



Leaves several-foliolate. 



Pod sessile or short-stipitate; stipe seldom exceeding the calyx. 

 Legume ovai, ovate, broadly oblong, or elhptic. 



Pod without long black hairs. II. Tenelli. 



Pod witli long black hairs. III. Debiles. 



Legume linear, 1.5 cm. long or longer. IV. Campestbes. 



Pod long-stipitate; stipe decidedly longer than the calyx. 



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

 branous; leaflets linear or filiform. V. Stenophylli. 

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

 more coriaceous. VI. Collini. 

 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. Macrocarpi. 



I. SIMPLICIFOLII. 



Calyx-teeth about half longer than the caly.x-tube; corolla ochroleucous or wliitish. 

 Calyx glabrous. 1. H. ligulalus. 



Calyx pubescent. 



Leaves almost flhform, sparingly hairy, pungent-pointed; pods mottled. 



2. //. exilifolius. 

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



3. H. simpHcifolius. 

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



Peduncles 1-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. //. brachycarpus. 



II. Tenelli. 

 Pod strictly sessile 



Leaflets narrowly Unear, often wanting. 8. H. lancelarius. 



Leaflets oblong to oval. 



Stems densely cesiJitose, 1-2 dm. liigh; racemes short, few-flowered. 



Kacemes 2-6-flowered, shorter than the leaves; leaflets oblong to oblanceolate, 



acute, canescent. 9. H. vexilliflexus. 



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

 glabrate above. 10. H. miser. 



Stems more simple, 2 dm. higii 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. Clementis. 



Pod short-stipitate. 



Corolla white, tinged with purple. 



Both sutm-es of the pod curved. 14. H. acerbus. 



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



Corolla ochroleucous. 

 Legume glabrous. 



Stipe rarely exceeding the tube of the calyx ; leave« usually spreading in age ; 



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



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

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

 Stipe 3—4 mm. long; leaflets linear or Unear-oblong ; stem usually conspicu- 

 ously strigose; caly.x-teeth half as long as the tube. 



17. H. lenellus. 

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

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



Legume strigose. 19. H. strigulosus. 



III. Debiles. 

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



20. H. debilis. 

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



21. H. BouTQovU. 

 IV. C.\mpestres. 



CoroUa ochroleucous, usually without any tinge of purple; upper leaves reduced to flU- 

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

 rush-like plants, with deep-seated roots and stem branched below the surface; 

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

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



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

 very acute. 22. H. campestris. 



