ORDEU 43. LEGUMINOS^E. 



than the wings. Sta. diadelphous (9 and 1), and, with the style, abruptly 

 bent near the summit. Pod (loment) of several 1 -seeded joints connected 

 by their middle. U Leaves unequally pinnate. 



II. boreale N. Erect; Ifts. 1321, oblong; stip. united, sheathing; flowers defioxed, 

 spiked on the long peduncle, violet-purple ; pod of 1 4 lens-shaped, veiny joints'. 

 Rocks, Willoughby Lake, Vt. and N. 1 2f. Flowers large. June, July. 



25 DESMODIUM, DC. BUSH TREFOIL. Calyx more or less bila- 

 biate. Vex. roundish, keel obtuse. Sta. diadelphous (9 and 1) sometimes 

 monadelphous. Pod (loment) compressed, jointed, constricted most on the 

 lower (dorsal) suture, the joints 1-seeded, separable, mostly aculeate and 

 adhesive. H ^ Leaves pinnately trifoliate. Flowers in racemes or often 

 large, loose panicles, purplish, in Summer. Figs. 191, 355. 



Legumes distinctly stiped, the stipes about as long as the joints. . . (a) 



a Stems prostrate, creeping. Leaflets round or oval Nos. 1 2f 



a Stems erect. Leaflets broadly ovate, or (in No. 6) narrowly.. .(ft) 



b Calyx teeth shorter than the tube Nos. 3 5 



b Calyx teeth longer than the tube, upper one notched. . .Nos. 6 8 



upper one entire No. 9 



4 Legume? subsessile, the stipes, if any, not exceeding the calyx. . .(e) 

 c Bracts large, covering the flower buds, caducous. . .(d) 

 e Bracts inconspicuous, smaller than the flower buds., .(e) 



d Stipule? large (6 9" long), ovate-lanceolate NOB. 10, 11 



d Stipules quite small, subulate Nos. 12, IS 



e Leaflets large (2 3' by 13'). oblong-ovate. ..Nos. 14, 15 



e Leaflets small, orbicular or oval Nos. 16 18 



e Leaflets long, linear.. .No. 19. Lfts. oblong. t.. .No. 20 



1 D. rotiuidii'ollum DC. Plant prostrate, downy; leaflets suborbicular; bracts 



and stipules broadly ovate, acuminate ; racemes few-flowered ; loment constricted on 

 both mannus nearly alike. Uocky woods. 2 3f. Purplish. August. 



2 D. ocliroleucumCurt. Plant decumbent, smoothish ; Ifts. ovate, rarely single ; slip. 



ovate, pointed ; raceme long, fls. white ; loment twisted. Woods, Md. & 8. (Porter). 



3 D. nndiflorum DC. Lfts. roundish ovate, bluntly acuminate, slightly glaucous 



beneath ; scape radical, panicled, smooth : joints of the loment obtusely triangular. 

 Woods, com. St. If, scape 2 3f, with many snail purple flowers. 



4 J>. acumliiatnni DC. Plant erect, simple, pubescent, leafy only at top; leaflets 



ovate, long-acuminate, the odd one round-rhomboidal ; pan. terminal, on a very long 

 peduncle. Woods, com. 8 12', the panicle 2 3f. Fls. small, flesh-color. Pod 3-jointed. 



5 D. pauclflomm DC. St. assnrgent. leafy all the way, retrorsely hairy ; ifts. thin, 



obliquely ovate, acutish. tennnal one p -bTr> > v"-dal ; rac. terminal, the flowers few, in 

 pairs ; petals all distinct, spreading. Woods, N. Y. to El. and La. If. Whitish. 



6 D. paiilculJitiiiii DC. Ero^t, slender, nearly glabrous; Ifts. oblong-lanceolate, 



obtuse ; slip, subulate, deciduous ; fls. on slender pedicels in panicled racemes ; lo- 

 ment of about 3 triangular joints. Woods, common, 2 3f. Purple. 



7 D. virldiflorum Beck. Densely pubescent ; Ifts. ovate, scabrous aoove, whitened 



beneath ; slip, lance-ovate, acunr'uate ; pan. naked, very long ; pod of 3 or 4 triangu- 

 lar joints. Alluvion, N. Y. and S. 3 4f, rigid. Violet, fading to green. 

 g D. Isevlgatum DC. Glabrous, or nearly so ; Ifts. ovate ; panicle eubsimple, pedi- 

 cels slender, in pairs. Woods, N. J., and S. 2 3f. Purple 

 . monopHi/llum. Dwarf, simple ; lower Ivs. 1-foliate. Oxbridge. Ms. If. CKicArd, 



