•>2(> XLVII. LEGUMINOSjE. Trifolium. 



Irom the stem, petiolules scarcely 2" long. Spicaie racemes terminal, solitary 

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



2. A. CANEscENs. Nutt. Lead Plant. 



Suffruticose and canescently villose ; Ifts. small, numerous, and crowded, 

 ovate-elliptical, subsessile, mucronate ; &fikcs aggregate ; /s. subsessile ; cal. 

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

 2 — if 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 coriaceous, 16 — 24 

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



16. DALE A. 



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



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

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

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

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

 herbaceous and glandular -punctate. Lvs. odd-phmate. Stipels 0, stipules 

 minute, setaceous. Spikes mostly dense. 



D. ALOPEcuRoiDEs. Willd. (D. LinnEei. Michx. 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 leafy 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 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. — % Lvs. unequally pinnate, 

 ex-stipellate. Fls. in dense, pedwiculate, terminal spikes or heads. 



1. P. CANDIDUM. Michx. (Dalea. Willi.) 



Glabrous, erect ; Ifls. 7 — 9, all sessile, linear-lanceolate, mucronate, 

 glandular beneath ; spikes on long peduncles ; bracts setaceous ; vex. 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 — 18" by 3 — 5", terminal one largest. Flowers small, Avhite, 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 ; vex. cordate, the other petals oblong, obtuse 

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

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

 very dense, J— IJ' long. Petals of a bright violet purple. Jl. Aug. 



18. TRIFOLIUM. Tourn. 



Gr. TpKpvWov, (three-leaved); Lat. trifolhtm; Fr. trefle; Eng. trefoil. 



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

 or less united at the base, withering : vexillum reflesed ; alie oblong, 

 shorter than the vexillum; carina shorter than the aire : 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. palmately trifoliate ; Ifts. loith straight, scarcely 

 reticulated veins. Flnioers in dense heads nr spikes. 



