286 XLVII. LEGUMINOS^S. TRIPOLIUM. 



Irom the stem, petiohiles scarcely 2" long. Spicate racemes terminal, solitary 

 or fascicled, 34' long. Vexillum purple, emarginate. Jn. 



2. A. CANERCENS. Nutt. Lead Plant. 



Suffruticose and canescently villose ; If is. small, numerous, and crowded, 

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

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



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 ; 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. Lxs. odd-pinnate. Stipels 0, stipules 

 minute, setaceous. Spikes mostly dense. 



D. ALOPECURolDEs. Willd. (D. Linnsei. Michx. Petalostemon. Ph.} 

 Glabrous and much branched ; If is. 814 pairs, linear-oval, obtuse 01 

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



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 

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

 seeded, indehiscent, included in the calyx. % Lvs. unequally pinnate, 

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



1. P. CANDIDUM. Michx. (Dalea. Willd.} 



Glabrous, erect; If Is. 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, 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 subglobo.se; rex. cordate, the other petals oblong, obtuse 

 at base.- 3 * A beautiful plant, of similar habits with the last. Stem slender, stri- 

 ate, subsimple, 1J 2f high. Leaflets about 1' by 1", all sessile. Spikes 18, 

 very dense, J- !' long. Petals of a bright violet purple, Jl. Aug. 



18. Till FOLIUM. Tourn. 



Gr. Tpi<p-o\\ov, (three-leaved); I .at. trifolium; Fr. trefie; Eng. trefoil. 



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

 or less united at the base, withering ; vexillum reflexed ; alae oblong, 

 shorter than the vexillum ; carina shorter than the alas ; 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. with straight, scarcely 

 reticulated veins. Flowers in dense head* or spi-kts. 



