Voi,. II.] 



PEA FAMILY. 



7. Trifolium medium I,. Zig-zag 



Clover. Cow- or Marl-grass. 



(Fig. 2076.) 



T. medium L,. Amoen. Acad. 4: 105. 1759. 



Closely resembling the preceding species. 

 Stem sometimes conspicuously zigzag, but 

 often straight, finely pubescent or glabrate. 

 Stipules lanceolate; leaflets lanceolate or ob- 

 long, not spotted, frequently entire except 

 for the projecting tips of the veins; heads al- 

 ways more or less peduncled; corolla 6"- 

 7" long, bright purple; calyx-tube nearly 

 glabrous, the teeth slightly pubescent. 



In fields and waste places, Nova Scotia and 

 Quebec to New York, west to Missouri. Also 

 on Vancouver Island. Adventive or naturalized 

 from Europe. Native also of Siberia. Summer. 



9. Trifolium Virginicum Small. 



Prostrate Mountain Clover. 



(Fig. 2078.) 



Trifolium Virginicum Small, Mem. Torr. 

 Club, 4: 112. 1894. 



Perennial from a long large root, diffusely 

 branched at the base, the branches pros- 

 trate, pubescent. Leaflets linear, narrowly 

 lanceolate or oblanceolate, 5 // -2o // long, 

 obtuse or cuspidate, serrate-dentate, gla- 

 brous above, more or less silky beneath, con- 

 spicuously veined; flowers in a globose head 

 about i' in diameter, whitish, crowded, the 

 slender pedicels \"-i" long; standard emar- 

 ginate-mucronate, striate; calyx silky, the 

 teeth long, subulate. 



Slopes of Kate's Mountain, Greenbrier Co., 

 W. Va. June. 



I 



8. Trifolium Beckwithii Brewer. 

 Beck with 's Clover. (Fig. 2077.) 



Trifolium Beckwithii Brewer; S. Wats. Proc. 

 Am. Acad. n: 128. 1876. 



Perennial, glabrous throughout; stems 

 rather stout, erect or nearly so, straight, 6'- 

 18' high. Basal leaves on long petioles; sti- 

 pules narrow, acute, i' long or less; leaflets 

 oblong, or somewhat oblanceolate, obtuse, 

 denticulate, 9 // -2 / long; heads long-pedun- 

 cled, globose, I'-iJ^' thick; flowers purple 

 or purplish, 6 // ~9 // long, very short-pedi- 

 celled, the lower at length reflexed; calyx- 

 teeth glabrous, linear-subulate, the longer 

 nearly equalling the tube; pod 2-6-seeded. 



Eastern South Dakota, probably introduced 

 from farther west. Native from Montana to 

 California. May-June. 



