226 XLVII. LEGUMINOStE. Tripolium. 



Irom the stem, petiolules scarcelj^ 2" long. Spicate racemes terminal, solitary 

 or fascicled, 3—4' long. Vexillum purple, emarginate. Jn. 



2. A. CANESCENS. Nutt. Lead Plant. 



Siiflruticose and canescently villose ; Ifls. small, numerous, and crowded, 

 ovate-elliplical, subsessile) mucronate ; spikes aggregate ; p. subsessile ; caX. 

 teclh equal, ovate, acute ; vex. bright blue ; leg. 1-seeded.— A beautiful species, 

 8—41' high, in dry, sandy soils ! Wis. to La. and Rocky Mts., and is supposed 

 to prefer localities of lead ore. Leaves 2—3' long. Leaflets coria,.ceous, 16—24 

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



16. DALEA. 



In honor of Thomas Dale, an English botanist of the last century. 



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

 wings and keel adnate to the staminate tube half way up ; vexilluic 

 free, the limb cordate ; stamens 10, united into a cleft tube ; ovary 2- 

 ovuled •• legume enclosed in the calyx, indehiscent, 1-seeded. — Moslly 

 herbaceous and glandular -imndaic. Lvs. odd-jpintiate. Stipds 0, stipulej 

 minute, setaceous. Spikes mosthj dense. 



D. ALOPECURoiDEs. Willd. (D. Linnffii. Mlchx. Petalostemon. Ph.) 

 Glabrous and much branched ; Ifts. 8—14 pairs, linear-oval, obtuse or 

 retuse, mucronate, punctate beneath ; spikes pedunculate, oblong-cylindric, ter- 

 minal,' silky ; bracts about equaling the acuminate segments of the calyx.—® 

 Prairies and bottoms. 111. ! Mo., Car. Plant about 2f high, bushy and lealy and 

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

 contact. Spikes 1—2' long. Vexillum white, wings and keel pale violet. 

 17. PETALOSTEMON. Michx. 



Alluding to the union of the petals and stamens. 



Calyx 5-toothed, nearly equal ; petals 5, on filiforiu claws, 4 of 

 them nearly equal, alternate with the stamens and united with the 

 Btaminate tube; stamens 5, monadelphous ; tube cleft; legume 1- 

 seeded, indehiscent, included in the calyx. — %■ Lvs. unequaUi/ pinnaie, 

 ex-siipellate. Fls. in dense., pedunculate, terminal spikes or heads. 



1. P. cANDiDDM. Mlehx. (Dalea. Willd.) 



Glabrous erect ; Iffs. 7 — 0, all sessile, linear-lanceolate, mucronate, 

 glandular beneath; spike's on long peduncles; bracts setaceous; rex. broadly 

 cordate, the other petals ovate.— A fine-looking plant, in dry prairies Southern 

 and Western States ! Stem 2 — 4f high, sparingly branched, slender. Leaflets 



9 \S" by 3 — 5", terminal one largest. Flowers small, white, crowded in dense 



spikes which are 1 — 3' long. Jl. 



2. P. vioLACEUM. Michx. (Dalea. Willd.) 



Minutely pubescent, erect; Ifts. 5, linear, glandular beneath; spikes 

 pedunculate, oblong or subglobose; rex. cordate, the other petals oblong, obtuse 

 at ba.se. — A 'beautiful plant, of similar habits with the last. Stem slender, stri- 

 ate, subsimple, li— 2f high. Leaflets about 1' by 1", all sessile. Spikes 1 — 8, 

 very dense, *— U' long. Petals of a bright violet purple. Jl. Aug. 

 18. TP.IFOLIUM. Tourn. 



Gr. rpKpv'Wov, (three-leaved) ; Lat. trifolium; Fr. trejle; Eng. trefoil. 



Calyx tttbular or campanulate, 5-toothed, persistent ; petals more 

 or less united at the base, Avithering ; vexillum reflexed ; alaj oblong, 

 shorter than the vexillum ; carina shorter than the alte ; stamens 10, 

 diadelphous (9 & 1) ; legume short, membranous, mostly indehiscent, 

 covered by and scarcely longer than the calyx, .2 — 4-seeded ; seeds 

 roundish. — Herbs. Lvs. falmaiely trifoliate ; Ifts. tcith straight, scarcely 

 reticulated veijis. Flowers in dense heads or sjjikes. 



