DICOTYLEDONS. 127 



XXII. CLITORIA. 



Perennial herbs ; leaves petioled, 3-foliate ; stipules per- 

 sistent ; flowers large, on axillary peduncles ; calyx tubular, 

 5-toothed, the two upper teeth partly united ; standard large, 

 erect, orbicular, emarginate, not spurred on the back, keel 

 much shorter than the wings ; stamens monadelphous below ; 

 style hairy ; legume stipitate, flattened, few-seeded. 



C. Mariana L. Butterfly Pea. Stem erect or twining, 

 smooth, 1-3 ft. long; leaves short-petioled, stipules small; leaflets 

 oblong-lanceolate, pale })eneath, stipellate; peduncles shorter than 

 the leaves, 1-3-flowered; flowers large, showy, pale purple, 1^-2 in. 

 long; legume 1-1 j in. long, i in. wide, acute, o-4-seeded. May- 

 August. Dry, sandy soil. 



XXIII. APIOS. 



Perennial twining vines, producing tubers from under- 

 ground shoots ; leaves petioled, odd-pinnate ; flowers in dense 

 axillary racemes ; calyx 2-lipped, the lateral teeth nearly 

 obsolete ; standard broad, reflexed, keel twisted ; stamens 

 diadelphous ; legume linear, compressed, many-seeded. 



A. Ai'ios (L.) MacM. GRorxD-xuT. Stems twining high, 

 juice milky, rootstocks bearing edible tubers; leaves short-] letioled ; 

 stipules small, soon deciduous; leaflets 5-7, ovate to ovate-lanceo- 

 late, acute, slightly stijx^llate; raceme shorter than the leaves, 

 densely many-flowered, often branching; flowers brownish-]>urple, 

 al»(»iii 1 in. long; legume linear, slightly compressed, seeds black, 

 sepaiated hy corky tissu(». .June-August. On <hnnp soil. 



XXIV. GALACTIA. 



Perennial lierbs ; stems ]n-ostrate or climbing, juice often 

 milky; leaves 3-foliate or ])innate, stipellate^ ; flowers small, 

 in axillary racemes; calyx 4-lobed, the ui)i)er lobe largest 

 and about as long as the tube ; standard oblong or obovate, 

 reflexed; stamens diadelj)hous ; ovary nearly sessihs style 

 not bearded ; legume linear. L'-valved, many-seeded. 



1. (!. i;i (ill. AIMS (I..) U.S. P. Stems proslrate. minulely |>ul>es- 

 eent. l.r.iii.-liiiiL;. L' :'. It. luii- ; leaves longer tliau (lie |M-li(.Ies; leaf- 



