PEA FAMILY 143 



Partial partition narrow, less than one-third the width of the pod. 

 Pod long-stipitate, glabrous at least in age. 



Plant loosely short-villous. 2. A. aboriginum. 



Plants appressed-silky or glabrous. 



Leaflets oblong. 3. A. Forwoodii. 



Leaflets linear. 



Plant grayish silky. 4. A. linear e. 



Plant glabrous or with a few scattered hairs. 5. A. glabriusculum. 



Pod short-stipitate, harry. 



Upper leaves not reduced; pod black-hairy. 6. A. Macounii. 



Upper leaves reduced, often unifoliolate; pod not black-hairy. 



7. A. ibapense. 

 Pod sessile, more turgid. 



Racemes many-flowered; leaflets oblong; partition of the pod narrow. 



Racemes elongate; pod short-obovoid. 8. A. elegans. 



Racemes short; pod oblong. 9. A. Shearii. 



Racemes few-flowered; leaflets Unear; partition of the pod broad. 



10. A. Brandegei. 



34. HOMALOBUS Nutt. 

 Legumes decidedly flattened lateraUy. 



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

 sessile. I. Simplicifolii. 



Leaves several-foliolate. 



Pod sessile or short-stipitate; 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 Unear, 1.5 cm. long or longer. IV. Oampestbes. 



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



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

 branous; leaflets linear or filiform. V. Stenophylli. 

 Calyx 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. Macbocaepi. 



I. SIMPLICIFOLH. 

 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. simplicif alius. 

 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 scarioxis; leaves 

 oblanceolate or spatulate. 6. H. brachycarpus. 



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 ; lea^ets oblong to oblanceolate, 



acute, canescent. 9. H. vexillifiexus. 



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 hairy ; plant green. 13. H. Clementis. 



Pod short-stipitate. 



Corolla white, tinged with purple. 



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



Lower suture of the pod stratight. 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 Unear or lineEir-oblong; stem usuaUy conspicu- 

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



17. H. lenellus. 



