88 ORDER 43. LEGUMINOS^E. 



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

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

 by their middle. If Leaves unequally pinnate. 



BE. boreale N. Erect; Ifts. 1 21, oblong; stip. united, sheathing ; flowers deflexed, 

 . epiked on the long peduncle, violet-purple ; pod of 14 lens-shaped, veiny joints. 

 Rocks, Willoughby Lake, Vt. and N. 1 2f. Flowers large. Jilne, 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. U > 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 2| 



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



b Calyx teeth shorter than the tube Nos. 36 



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



upper one entire No. 9 



| Legumes eubsessile, 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 (G 9" long), ovate-lanceolate Nos. 10, 11 



d Stipules quite small, subulate Nos. 12, 18 



e Leaflets large (23' by 12'), 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. rottmdifolium DC. Plant prostrate, downy; leaflets suborbicular ; bracts 



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

 both margins nearly alike. Rocky woods. 2 3f. Purplish. August. 



2 IK ochroleucum Curt. Plant decumbent, smoothish ; Ifts. ovate, rarely single ; stip. 



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



3 D. nudiflorum 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 small purple flowers. 



4 I>. acuminatum 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 I>. pauciflorum DC. St. assurgent, leafy all the way, retrorsely hairy ; Ifts. thin, 



obliquely ovate, acutish, terminal one rho.mboidal ; rac. terminal, the flowers few, in 

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



6 D. paniculatum DC. Erect, slender, nearly glabrous; Ifts. oblong-lanceolate, 



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

 ment of about 3 tnangular joints. Woods, commou, 2 3f. Purple. 



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



beneath ; stip. lance-ovate, acuminate ; pan. naked, very long; pod of 3 or 4 triangu- 

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



8 D. laevigatum DC. Glabrous, or nearly eo ; Ifts. ovate ; panicle subsimple, pedi- 



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

 ft. tnonophyllitm. Dwarf, simple ; lower IVB. 1-foliate. Oxbridge. Mi. If. CRioardJ 



