58 LEGUMINOS^E. (PULSE FAMILY.) 



conspicuous, ovate, pubescent, deciduous : calyx very villous, with long slender 

 teeth. From Colorado to S. Arizona and eastward to the Mississippi from 

 Texas to Illinois. 



2. D. laxiflora, Pursh. Erect, 3 to 4 feet high : branches slender and 

 spreading : leaflets 4 to 5 pairs, linear-oblong : spikes panided, few-flowered : 

 flowers distant, white : bracts very broad, almost orbicular, glandular, -coriaceous, 

 glabrous, slightly cuspidate : calyx-teeth beautifully plumose. From Colorado 

 to the plains of the Missouri, and southeastward to Arkansas and Texas. 



3. D. formosa, Torr. Suffruticose, much branched : leaflets very small, 

 about 5 pairs, cuneate-oblong, retuse, dotted with black glands beneath : spikes loose, 

 few-flowered, on short peduncles : flowers large and showy, bright purple : bracts 

 ovate, silky-villous on the margin. On the Platte (James), and southward. 



# # Not glabrous: flowers yellow (deep purple in No. 7). 

 t- Leaves palmately trifoliolate, not dotted. 



4. D. Jamesii, Torr. & Gray. Stems several from one root, 4 to 9 inches 

 high, somewhat woody at base : whole plant silky-pubescent : leaflets obovate, 

 very obtuse : spikes oblong, sessile, dense and broad ; bracts ovate, acuminate, 

 villous. S. Colorado and southeastward. 



M- -t- Leaves pinnately compound, with 2 to G pairs of leaflets. 



5. D. aurea, Nutt. Stem pubescent, erect, 2 feet high : leaflets 3 to 4 

 pairs, oblong-obovate and linear-oblong, more or less silky-pubescent : spikes ovate, 

 very compact, on long peduncles : bracts rhombic-ovate, as long as the calyx. 

 On the plains from the Missouri River to Texas. 



6. D. rilbescens, Watson. Like the last but more slender, the leaves tri- 

 foliolate, and the flowers smaller, the yellow petals becoming purplish. Proc. 

 Am. Acad. xvii. 369. D. nana, Torr., var. elutior, Gray. S. E. Colorado, 

 southward and eastward. 



7. D. lanata, Spreng. Decumbent, canescently tomentose throughout: the 

 stems 1 to 3 feet long : leaflets 4 to 6 pairs, obovate-cuneate, emarginate : spikes 

 usually opposite the leaves. From Nebraska, Arkansas, and Indian Territory 

 to Texas, New Mexico, S. Colorado, and Utah. 



8. PETALOSTEMON, Michx. PRAIRIE CLOVER. 



Similar to the last, but with only 5 stamens and the flowers always in dense 

 bracteate cylindrical spikes. 



* Smooth or nearly so : leaflets 5 t o 9 : spikes globose to cylindrical. 



1. P. violaceUS, Michx. Leaflets 5, narroivly linear: spikes globose- 

 ovate, or oblong-cylindrical when old : bracts pointed, not longer than the si/ky- 

 hoan/ calyx : corolla rose-purple. Prairies from the Saskatchewan to Texas, 

 and from Colorado to Indiana. 



2. P. can-didus, Michx. Leaflets 7 to 9, lanceolate or linear-oblong : spikes 

 oblong, cylindrical when old : bracts awned, longer than the nearly glabrous 

 calyx: corolla white. With the last. 



3. P. macrOStachyuS, Torr. Leaflets 5 to 7, lanceolate-oblong, obtuse, 

 dotted beneath : spikes cylindrical, elongated : bracts as long as the flower : 

 calyx silky-villous : corolla nearly white. From Colorado to Oregon. 



