PEA FAMILY 509 



Legumes decidedly flattened laterally. 



Leaves simple or some of them rarely 3-foliolate; plants pul vinate-cespitose ; pod 

 sessile. I. SEMPLICIFOLII. 



Leaves several-foliolate. 



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

 Legume ovai, ovate, broadly oblong, or elliptic. 



Pod without long black hairs. II. TENELLI. 



Pod with long black hairs. III. DEBILES. 



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



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



Calyx not gibbous at the base, less than hah" 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. PLEXUOSI. 

 Pod long-stipitate; stipe longer than the calyx. VIII. MACROCARPI. 



I. SIMPLICIFOLII. 



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

 Calyx glabrous. 1. H. ligulatus. 



Calyx pubescent. 



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



2. H. exilifolius. 

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



3. H. simp lid folius. 

 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. H. br achy carpus. 



II. TENELLI. 

 Pod strictly sessile 



Leaflets 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 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. 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 hairy ; plant green. 13. H. dementis. 



Pod short-stipitate. 



Corolla white, tinged with purple. 



Both sutures 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; leaves usually spreading in age; 



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



Stipe of the mature legume usually exceeding the calyx-teeth; leaves strongly 



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

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

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



17. H. tenellus. 

 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. strigulosus. 



III. DEBILES. 



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



20. H. debilis. 

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



21. H. Bourgovii. 

 IV. CAMPESTRES. 



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-like plants, 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 linear-subulate to linear, 

 very acute. 22. H. campestris. 



