316 Order 46.— LEGUMINOS^. 



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

 from the stem. Petiolules scarcely 2" long. Splcate rao. 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 ujjper obtuse, the 3 lower longer, or nearly equal, villous ; sty. hairy towards the 

 base.— Near "Wilmington and Newbern, N. Car. Plant 4 to 6f high. Fls. dark 

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



3 A. herb^ea Walt. Pubescent and somewhat hoary, shrubby; Ifts. 20 to 25 

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

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

 Plant 2 to 4f high, grayish. Lvs. 6 to ''7' long; Ifts. 6 to 8" by 3". Petiolules 

 1" long. Spikes many, clustered at top, very downy, 6 to 8' long. Jn., Jl. 



4 A. oan6soen3 Nutt Suffruticous, and canescently villous, Ifts. small, numerous, 

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

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

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

 to prefer localities of lead ore. Lvs. 2 to 3' long; Ifts. coriaceous, 16 to 24 pairs, 

 obtuse at base, 4 to 6" by 1 to 2". Spikes 2 to 3' long. Jl., Aug. 



36. DA^LEA, L. (In honor of Thomas Dale, an English hotanist.) 

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

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

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

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

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

 minute, setaceous. Spikes mostly dense. 



D. alopecuroides "Willd. Glabrous and much branched ; Ifts. 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. — CD Prahies and bottoms, 111., Mo., Car. Plant about 2f high, bushy and 

 leafy and pale green. Lfts. not more than 4'' by 1", sessile, and nearlyiu 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-toothed, 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 "H-. Lvs. un- 

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

 spikes or heads. 



§ PETALOSTE.MON proper. Calyx teeth short. Heads not involucrate. Bracts small ia\ 



a Bracts aristate-pointed, longer than the calyx .Mos. 1, 2 



a Bracts obtuse or acute, not aristate, short Nos. 8, 4 



§ KxrnNiSTBEA, Lam. Calyx teeth very long, setaceous, plumous, pappus-like. Hds. 



involucrate, with broad, scale-like bracts No. 6 



1 P. candidum Mx. Glabrous, erect ; lfts. 1 to 9, all sessile, linear-lanceolate, 

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

 longen- 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 one largest. Hs. small, 

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



2 P. violaceum Mx. Minutely pubescent, erect ; lfts. 5, linear, glandular be- 

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

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

 similar habits with the last. St. slender, striate, subsimple, IJ to 2f high. Lfts. 

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

 bright violet-purple. Jl., Aug. 



