VOL. II.] 



PEA FAMILY. 



325 



ii. Lespedeza leptostachya Engelm. 

 Prairie Bush-clover. (Fig. 2202.) 



Lespedeza leptostachya Engelm.; A. Gray, Proc. Am. 

 Acad. 12: 57. 1876. 



Erect, simple or branched, i-3 high, silvery-pu- 

 bescent with appressed hairs. Stipules subulate; 

 petioles shorter than the leaves; leaflets linear, I'-i^ 7 

 long, i // -2 // wide; spikes slender, interrupted and 

 loosely flowered, on peduncles equalling or exceeding 

 the leaves; corolla as in the preceding species; 

 flowers all complete; pod ovate, pubescent, about 

 1%" long, nearly equalling the calyx. 



Prairies, Illinois to Iowa, Wisconsin and Minnesota. 

 Aug.-Sept. 



12. Lespedeza striata (Thunb.) H. & 

 A. Japan Clover. (Fig. 2203.) 



Hedysarum striatum Thunb. Fl. Jap. 289. 1784. 

 Lespedeza striata H. & A. Bot. Beechey, 262. 1841 . 

 Annual, diffuse or ascending, branched, 

 tufted, sparingly appressed-pubescent, 6 / -i2 / 

 long. Stipules ovate, acute or acuminate, i"- 

 2" long; petioles much shorter than the leaves; 

 leaflets oblong or oblong-obovate, 4 // -9 // long, 

 i // -4 // wide, obtuse at the apex, narrowed at the 

 base, their margins usually sparingly ciliate; 

 flowers 1-3 together, both petaliferous and apet- 

 alous, sessile or nearly so in the axils; corolla 

 pink or purple, about l /i" long ; calyx-lobes 

 ovate; pod oval, acute, exceeding the calyx- 

 lobes. 



In fields, Virginia to Illinois, Missouri, and 

 very common in the Southern States. Naturalized 

 from eastern Asia. Hoopkoop-plant. July-Aug. 



36. VICIA I,. Sp. PI. 734- 1753- 



Climbing or trailing, herbaceous vines, with pinnate tendril-bearing leaves, half-sagit- 

 tate or entire stipules, and axillary sessile or racemose, blue violet or yellowish flowers. 

 Calyx-tube somewhat oblique, obtuse at the base, its teeth about equal, or the two upper 

 ones slightly longer. Standard obovate or oblong, emarginate, clawed ; wings obliquely 

 oblong, adherent to the shorter oblong curved keel. Stamens diadelphous (9 and i), or 

 monadelphous below ; anthers all alike. Ovary sessile or stipitate ; ovules co ; style 

 very slender, with a tuft or ring of hairs at its summit. Pod flat, dehiscent, 2-valved, con- 

 tinuous between the seeds. [The classical Latin name of the Vetch.] 



About 120 species of wide geographic distribution. In addition to the following, about 12 

 others occur in the southern and western parts of North America. 

 Flowers racemed or spicate; peduncles elongated. 

 Indigenous perennials. 



Spike-like racemes dense, i -sided, 15-40-2 owe red. i. V. Cracca. 



Racemes loose, i-2o-flowered. 

 Flowers 7"-io" long. 



Leaflets elliptic, or ovate -oblong. 2. V. Americana. 



Leaflets narrowly linear; western. 3. V. linearis. 



Flowers 2" -5" long. 



Racemes 8-20- flowered; flowers 4" -5" long. 4. V. Caroliniana. 



Racemes i-6-flowered; flowers 2" -4 long. 



Leaflets 2-5 pairs, linear, or those of the lower leaves oval or obovate. 



5. V. micrantha. 



Leaflets 4 or 5 pairs, all oval, elliptic or obovate. 6. V. Ludoviciana. 



Introduced annuals; flowers few, 2" -3" long. 



Pod glabrous, 3-6-seeded. 7. V. tetrasperma. 



Pod pubescent, 2-seeded. 8. V. hirsuta. 



