132 LEGUMINOS^. (pulse FAMILY.) 



* * Pods 2-seeded^' leaflets larger, scattered. 

 3. A. frutic6sa, L. (False Indigo.) A tall shrub, rather pubescent 

 or smoothish , leaflets 8-12 pairs, oblong to broadly elliptical. — River-banks, 

 S Penn. to Fla., west to Sask., Tex., and the Rocky Mts. Very variable. 



15. DALEA, L. 



Calyx .5-cleft or toothed. Corolla imperfectly papilionaceous ; petals all on 

 claws; the standard heart-shaped, inserted in the bottom of the calyx; the 

 keel and wings borne on the middle of the monadelphous sheath of filaments, 

 which is cleft down one side. Stamens 10, rarely 9. Pod membranaceous, 

 1 -seeded, indehiscent, enclosed in the persistent calyx. — Mostly herbs, more 

 or less glandular-dotteci, with minute stipules; the small flowers in terminal 

 spikes or heads (Named for Samuel Dale, an English botanist.) 



* Glabrous; flowers white or rose<olor; leaflets A -20 pairs ; annuals. 



1. D. alopecuroides, Wilkl. Erect (1-2° high); leaflets 10-20 pairs, 

 linear-oblong; flowers light rose-color or whitish, in cylindrical spikes ; bracts 

 ovate-lanceolate, acuminate, deciduous ; calyx very villous, with long slender 

 teeth. — Alluvial soil, Minn, to 111. and Ala., west to the Rocky Mts. 



2. D. laxiflora, Pursh. Erect (1-4° high), branching; leaflets 3-5 

 pairs, linear, 2 -3" long; spikes loosely-flowered; bracts conspicuous, persist- 

 ent, almost orbicular and very obtuse ; petals white ; calyx densely villous, 

 the long teeth beautifully plumose. — Iowa and Mo. to Tex., west to Col. 



* * Pubescent : leaflets 3-4 pairs ; perennial herbs. 



3. D, atirea, Nutt. Stems erect and simple, 1-3° high; leaflets oblong- 

 obovate to linear-oblong, more or less silky-pubescent ; spikes solitarv, oblong- 

 ovate, very compact and densely silky ; bracts sliort, rhombic-ovate ; petals 

 yellow, — On the plains, Mo. to Tex., and westward. 



4. D. lanata, Spreng. Very pubescent throughout, 1 - 2° high, branch- 

 ing; leaHets obovate to oblong-obovate, 2-3" long; spikes slender, rather 

 loose, the obovate acute bracts equalling the small short-toothed calyx ; petals 

 short, purple. — Central Kan. to Tex., and westward. 



16. PETALOSTEMON, Michx. Prairie Clover. 



Calyx 5-toothed. Corolla indistinctly papilionaceous ; petals all on thread- 

 sliaped claws, 4 of them nearly similar and spreading, borne on the top of the 

 monadelphous and cleft sheath of filaments, alternate with the 5 anthers ; the 

 fifth (standard) inserted in the bottom of the calyx, heart-sliaped or oblong. 

 Pod membranaceous, enclosed in the calyx, indehiscent, 1 -2-seeded. — Chiefly 

 perennial herbs, upright, glandulai'-dotted, with crowded odd-pinnate leaves, 

 minute stipules, and small flowers in very dense terminal and peduucled heads 

 or spikes. (Name combined of the two Greek words for petal and stamen, 

 alluding to the peculiar union of these organs in this genus.) 



1- P. Violaceus, Michx. Smoothish; leaflets 5, narrowly linear ; heads 

 globose-ovate^ or oblong-cylindrical when old ; bracts pointed, not longer than 

 the silky -hoary calyx; corolla rose-purple. — Dry prairies, Minn, to lud. and 

 Tex., west to the Rocky Mts July. 



