316 ORDER 46. LEGUMINOS^. 



Mts. Lvs. 3 to 5' long; Ifls. about 1 by V, rather remote from each other and 

 from the stem. Petiolules scarcely 2" long. Spicate rac. terminal, solitary or 

 fascicled, 3 to 4' long, Vexillum purple, emarginate. May, Jn. 



2 A. glabra Desf. Nearly glabrous, shrubby ; Ifts. oblong or elliptical, dotted, 

 petiolulate, the lowest pair close to the stem ; fls. subsessile ; cal. teeth short, the 

 2 upper oblu.se, the 3 lower longer, or nearly equal, villous ; sty. hairy towards the 

 base. Near Wilmington and Newbern, N. Car. Plant 4 to 5f high. Fls. dark 

 blue. Jl. (v. s. in herb. Curtis.) (A. Caroliniana Groom). 



3 A. herbacea Walt. Pubescent and somewhat hoary, shrubby; Ifts. 20 to 25 

 pairs, oblong, obtuse, dotted, the lowest pair close to the stem; fis. subsessile; 

 teeth of the cal. nearly equal, short; cor. whitish. Pine woods, N. Car. to Fla. 

 Plant 2 to 4f high, grayish. Lvs. 5 to 7' long; Ifts. G to 8" by 3". Petiolules 

 1" long. Spikes many, clustered at top, very downy, G to 8' long. Jn., Jl. 



4 A. canescens Nutt. Suffruticous, and canescently villous, Ifts. small, numerous, 

 crowded, ovate-elliptical, subsessile, mucronate; spikes aggregate; fis. subsessile; 

 calyx teeth equal, oval acute; vex. bright blue; leg. 1-seeded. A beautiful 

 species, 2 to 4f high, in dry, sandy soils, Wig. to La. and R. Mts., and is supposed 

 to prefer localities oflead ore. Lvs. 2 to 3' long; llts. coriaceous, 1G to 2-i pairs, 

 obtuse at base, 4 to G" by 1 to 2". Spikes 2 to 3' long. JL, Aug. 



36. DA'LEA, L. (In honor of Thomas Dale, an English botanist.) 

 Calyx subequally cleft or toothed ; petals unguiculate, claws of the 

 wings and keel adnatc to the staminate tube half way up ; vexillum 

 free, the limb cordate; stamens 10, united into a cleft tube; ovary 

 2-ovuled ; legume inclosed in the calyx, indehisccnt, 1-seeded. Mostly 

 herbaceous and glandular-punctate. Lvs. odd-pinnate. Stipcls 0, stip. 

 minute, setaceous. Spikes mostly dense. 



D. alopecuroides Willd. Glabrous and much branched ; Ifls. 8 to 14 pairs, 

 linear-oval, obtuse or retuse, punctate beneath ; spike pedunculate, oblong-cylin- 

 dric, terminal, silky-villous ; bracts about equaling the acuminate segments of the 

 cal. (J) Prairies and bottoms, 111., Mo., Car. Plant about 2f high, bushy and 

 leafy and pale green. Lfts. not more than 4''. by 1", sessile, and nearly in mutual 

 contact. Spikes 1 to 2' long. Vexillum white, wings and keel pale violet. (D. 

 Linnaei MX. Petalostemon Ph.) 



37. PETALOSTE'MON, MX. (Alluding to the union of the petals 

 and stamens.) Calyx 5-toothcd, nearly equal ; petals 5, on filiform 

 claws, 4 of them nearly equal, alternate with the stamens and united 

 with the staminate tube ; stamens 5, monadelphous, tube cleft ; legume 

 1-seeded, indehiscent, included in the calyx. Mostly ^. Lvs. un- 

 equally pinnate, exstipellatc. Fls. in dense, pedunculate, terminal 

 spikes or heads. 



PETALOSTEMON proper. Calyx teeth short. Heads not involucrate. Bracts small (a). 



a Bracts nristate-poiuteil, longer than the calyx Nos. 1, 2 



a Bracts obtuse or acute, not^iristate, short Nos. 3, 4 



KCRNISTERA, Lam. Calyx teeth very long, setaceous, plumous, pappus-like, lids. 



involucrate, with broad, scale-like bracts .No. 5 



1 P. candidum MX. Glabrous, erect ; Ifts. ^ to 9, all sessile, linear-lanceolate, 

 mucronate, glandular beneath; spikes on long peduncles; bracts setaceous, 

 longer than the white petals ; vex. broadly cordate, the other pets, ovate. A fine- 

 looking plant in dry prairies, S. and W. States. St. 2 to 4f high, sparingly 

 branched, slender. Lfts. 9 to 18" by 3 to 5", terminal ono largest. Fls. small, 

 white, crowded in dense spikes which are 1 to 3' long. Jl. 



2 P. violaceum MX. Minutely pubescent, erect , Ifts. 5, linear, glandular be- 

 neath ; spikes pedunculate, oblong or oval bracts shorter than the violet petals ; 

 ver. cordate, the other petals oblong, obtuse at base. A beautiful plant, of 

 eimilar habits with the last. St. slender, strrate, subsimp/e, 1 to 2f Iriffh. Lfts. 

 about 1' by 1'', all sessile. Spikes 1 to 8, very dense, to !' long. Petals of a 

 bright violet-purple. Jl., Aug. 



