FABACEAE. 



VOL. II. 



7. Trifolium medium L. Zig-zag or 

 Mammoth Clover. Cow- or Marl- 

 grass. Fig. 2480. 



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 oblong, not 

 spotted, frequently entire except for the pro- 

 jecting tips of the veins; heads always more 

 or less peduncled ; flowers very nearly sessile; 

 corolla 6"-7" long, bright purple ; calyx-tube 

 nearly glabrous, the teeth slightly pubescent. 



In fields and waste places, Nova Scotia, Ontario 

 and Massachusetts. Erroneously recorded from 

 Missouri and elsewhere. Adventive or naturalized 

 from Europe. Native also of Siberia. Cow- or 

 giant-cloverl Pea-vine clover. Summer. 



8. Trifolium Beckwithii Brewer. Beck- 

 with's Clover. Fig. 2481. 



Trifolium Beckwithii Brewer ; S. Wats. Proc. Am. 

 Acad. ii : 128. 1876. 



Perennial, glabrous throughout ; stems rather 

 stout, erect or nearly so, straight, 6'-i8' high. 

 Basal leaves on long petioles; stipules narrow, 

 acute, i' long or less ; leaflets oblong, or some- 

 what oblanceolate, obtuse, denticulate, g"-2 r 

 long ; heads long-peduncled, globose, i'-ii' 

 thick ; flowers purple or purplish, 6"-g" long, 

 very short-pedicelled, the lower at length re- 

 flexed; 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 Cali- 

 fornia. May-June. 



9. Trifolium virginicum Small. 



Prostrate Mountain Clover. 



Fig. 2482. 



Trifolium virginicum Small, Mem. Torr. Club 4 : 

 112. 1894. 



Perennial from a long large root, diffusely 

 branched at the base, the branches prostrate, 

 pubescent. Leaflets linear, narrowly lanceolate 

 or oblanceolate, 5"-2o" long, obtuse or cuspi- 

 date, serrate-dentate, glabrous above, more or 

 less silky beneath, conspicuously veined; flow- 

 ers in globose heads about i' in diameter, 

 whitish, crowded, the slender pedicels I - 

 long; standard emarginate-mucronate, striatc; 

 calyx silky, the teeth long, subulate. 



Slopes of Gate's Mountain, Greenbrier Co., W. 

 Va. June. 



