132 LEGUMINOS^. (pulse FAMILY.) 



* * Pods 2-seeded ; lea/lets larger, scattered. 

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

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

 S I'enn to 11a., west to Sask., Tex., and the Rocky Mts. Very variable. 



15. DALEA, L. 



Calyx .'i-eleft 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-dotted, with minute stipules ; the small flowers in terminal 

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



* Glabrous; floicers ivhite or rose-color ; leaflets A -20 pairs ; annuals. 



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

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

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

 teetli. — 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 ^- A pairs : perennial herbs. 



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

 obovate to linear-oblong, more or less silky-pubescent ; spikes solitary, ol)long- 

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

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

 short, purple. — Centr^il Kan. to Tex., and westward. 



16. PETALOSTEMON, Michx. Prairie Clover. 



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

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

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

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

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

 perennial herbs, upright, glandular-dotted, with crowded odd-pinnate leaves, 

 miijute stipules, and small flowers in very dense terminal and peduncled heads 

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

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



1- P. VlOl^ceuS, Mirhx. Sruoothish : leaflets 5, narrowl if linear ; heads 

 globose-ovate., OT oldong-cyliudrical when old; bracts pointed, not longer than 

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

 Tex., west to the Rocky Mts July. 



