128 ELEMENTS OF BOTANY. 



lets oval, rigid, smooth above, pubescent beneath, the upper one 

 long-stalked; racemes shorter than the leaves, 8-0-flowered; flow'ers 

 large, reddish-pm-ple ; style long; legume linear, curved, nearly 

 smooth, 4-6-seeded. June-August. Dry pine barrens. 



2. G. voLUBiLis (L.) Britt. Stems twining or prostrate, much- 

 branched, pubescent or nearly smooth, often several feet in length ; 

 leaflets thin, oval to linear-oblong, rounded or emarginate at both 

 ends, smooth or slightly hairy above, paler and pubescent beneath ; 

 racemes slender, variable in length, often several times as long as 

 the leaves, single or 2-3 from the same axil; flowers single, or 2--\ 

 together, purplish, about ^ in. long; legume linear, nearly straight, 

 compressed, pubescent. June-July. On dry soil. 



XXV. RHYNCHOSIA. 



Perennial herbs ; stems erect or twining ; leaves 1-3-foli- 

 ate ; leaflets mostly resinous-dotted ; floAvers yellow, in dense 

 axillary or terminal racemes or spikes; calyx 2-lipped, 4-5- 

 toothed; standard orbicular or reniform, reflexed ; stamens 

 diadelphous ; ovary sessile, style slender ; legume short, 1- 

 2-seeded. 



1. R. MINIMA DC. Climbing Rhynchosia. Stem twining, 

 widely branched, tomentose, 3-G ft. long; leaflets small, orbicular 

 or rhombic, acute, rugose above, dotted beneath ; racemes very 

 slender, 2-3 times as long as the leaves; flowers scattered, minute, 

 reflexed; legume strongly curved. May-July. Sandy soil, espe- 

 cially near the coast. 



2. R. simplicifolia (Walt.) Wood. Round-leavp:d Rhyn- 

 chosia. Stem erect, rough, hairy, 3-8 in. high ; leaves pubescent ; 

 stipules lanceolate; petioles about as long as the single, orbicular 

 or reniform, erect, j^ubescent leaflet ; racemes dense, often clustered ; 

 legume oblong, compressed, 1-2-seeded. April-June. On dry soil. 



XX VT. PHASEOLUS. 



Annual or perennial herbs ; stems twining or prostrate ; 

 leaves trifoliate ; flowers in axillary racemes or clusters ; 

 calyx 5-toothed, the two upper teeth somewhat united ; stand- 

 ard orbicular, often recurved, keel spirally twisted; stamens 

 diadelphous ; legume linear or falcate, few-m any-seeded. 



P. POLYSTACHYUS (L.) B, S. P. WiLD Bkan. Pereuiiial ; 

 stem twining or trailing, branching, pid)esceiit, 10-1.5 ft. long; 



