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 grajlsh silky. 4. A. lineare. 



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



Pod short-stipitate, hairy. 



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 linear; partition of the pod broad. 



10. A. Brandegei. 



34. HOMALOBUS Nutt. 



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 caly.x. 

 Legume ovai, ovate, broadly oblong, or elhptic. 



Pod without long black hairs. II. Tenelli. 



Pod with long black hairs. III. Debiles. * 



Legume hnear, 1.5 cm. long or longer. IV. Caiipestres. 



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 flhform. V. Stenophylli. 

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

 more coriaceovis. 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 calyx-tube; corolla ochroleucous or whitish. 

 Calyx glabroas. 1. H. ligulatus. 



Calyx pubescent. 



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



2. H. exilif alius. 

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



3. H. simplicifolius. 

 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. 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; leaflets oblong to oblanceolate, 



acute, canescent. 9. H. vexilliflexus. 



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

 glabrate above. 10. H. miser. 



Stems more simple, 2 dm. liigh 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. wingalanus. 



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



Pod short-stipitate. 



Corolla wliite, tinged with piirple. 



Both sutures of the pod curved. 14. //. 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. //. dispar. 



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

 ascencUng; leaflets narrowly hnear 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. 



