PAM. 93. 73 



ling heads; corolla white. Dry sandy soil. Summer. 

 19. Corolla yellow. -----------20 



19. Corolla not yellow. ------____, _, 



20. Flowers of two kinds; one kind complete but sterile, the other with- 



out calyx, corolla and stamens, but fertile; — rigid herbs with bristly 

 or sticky -pubescent foliage; leaflets 3. prominently veined; flowers 

 in spikes or heads; calyx 2-lipped; stamens monadelphous; style 

 filiform; loment 2-jointed. the lower joint empty. 



Stylosanthes, Pencil- ■/Urwer 

 S. biflora (hispida^. Pubescent in lines or hispid; stipules sheathing; spikes 

 3-4 flowered. Sandy pine-land. Summer. 



20. Flowers perfect. --------____>, 



21. Leaves 4-foliate; — erect or prostrate herbs; flowers in conspicuously 



bracted spikes; calyx 2-lipped. 5-cleft or toothed; claw or vexillum 

 broad; wmgs oblique, shorter than the keel; stamens monadel- 

 phous, anthers alternately longer and attached at the base, and 

 shorter and versatile; style filiform; loment flat, several-jointed. - Zornia 

 Z. bracteata (tetraphylla). Peduncles longer than the leaves; bracts ovate and 

 auricled; spikes 3-9 flowered; vexillum a hooded blade on a slender claw, 

 loment 3-4 jointed. Sandy soil. Spring and Summer. 



21. Leaves odd-pinnate; — flowers in racemes or panicles; calyx more 



or less two-lipped; corolla with a broad standard, and curved 

 keel; stamens diadelphous in two groups of 5, anthers alike; 

 style incurved; loment flat, 2 or more jointed, Aeschynomene, Joint-vetch 



A. viscidula. Prostrate perennial; leaflets 5-9; peduncles few flowered; pods 

 2-3 jointed, joints half-orbicular. Sandy ground near the coast. Summer 

 and Fall. 



A. virginica ihispida). Erect annual; leaflets numerous; peduncles several flow- 

 ered; pods 6-10 jointed, joints nearly square. Swampy soil. Summer. 



22. Leaflets stipellate; loments of 2-more joints; — chiefly branching 



herbs with pinnately-trifoliate stipulate leaves; flowers in racemes 

 and panicles; calyx bracted, 2-lipped, the upper lip emarginate 

 or entire, the lower 3-cleft; stamens diadelphous or nearly so; 

 loment 2-6 jointed. Summer and Fall. 



Meibomia Desmodium), Tick-trefoil, Beggar's tick* 

 a. Leaflets linear. -----------b 



a. Leaflets not linear. -------_-_ c 



b. Joints of the loment triangular; — stem erect, finally pubescent; 



stipules setaceous, deciduous; corolla purplish; loments 2-3 

 jointed, joints small, with straight or depressed backs. Pine- 

 barrens. --------- m. stricta 



b. Joints of the loment not triangular; — stem rough with curved 



hairs; stipules caducous; corolla pinkish purple; loment 2-3 



jointed, joints rounded. Pine land. - - - - M. tenuifolia 



c. Stem trailing or reclining; — stipules persistent, subulate; leaflets 



suborbicular; corolla purplish; loment 2-4 jointed, joints nearly 



oval. Sandy soil. - - - - M. arenicola D. line&tum) 



c. Stem erect or ascending, ------ ---d 



d. Foliage pubescent; — stipules lanceolate; leaflets scabrous above 



villous or tornentose beneath; corolla pale purple, turning 



green; loment 2-4 jointed, joints half-rhombic Woods. M. riridiflori 



