TRIFOLIUM. XLVII. LEGUMINOS^E. 227 



* Heads not involucrate. Flowers pedicellate, deflexed when old. 



1. T. REPENS. Creeping or White Clover or Trefoil. Shamrock. 



St. creeping, diffuse; l/ts. obcordate, denticulate; stip. narrow, scarious; 

 /ids. subumbellate, on very long, axillary peduncles ; leg. about 4-seeded ; col. 

 teeth, shorter than the tube. 7J. In all soils, mountainous, meadow or rocky, 

 throughout N. Am. Stems several from the same root, extending 6 12', root- 

 ing at the joints. Peduncle angular, much longer than the leaves. Flowers 

 white. May Sep. Highly valued for pasturage. 



2. T. REFLEXUM. Buffalo Clover. 



Pubescent ; ascending or procumbent ; If is. obovate or oblong-obovate, 

 serrulate, some of them emarginate; stip. leafy, semi-cordate; Ms. many-flow- 

 ered; leg. about 4-seeded Tj-l Prairies and meadows, Western! and Southern 

 States. Stem 8 16' high. Leaflets subsessile, 7 8" by 4 5"; petioles 1 2' 

 long. Heads large and handsome. Peduncles 1 3' long. Vexillum rose- 

 red. Apr. Jn. 



3. T. STOLONIFERUM. Muhl. Running Buffalo Clover. 



Glabrous, creeping; branches axillary, ascending, short; Ifts. broadly 

 obcordate, denticulate ; stip. leafy, ovate-lanceolate, acuminate ; fls. loose, um- 

 bellate-capitate ; leg. about 2-seeded. 1\. Fields and woods, Western States ! 

 Stems 6 12' long, several together. Branches 3 4' high, generally with one 

 head, which is V diam. Leaflets 6 10" by 5 9". Flowers white, erect, but 

 in fruit all reflexed. May, Jn. 



* * Heads not involucrate. Flowers never deflexed twr yellow. 



4. T. ARVENSE. Hare's-foot Trefoil. 



Hds. cylindrical, very hairy ; calyx teeth setaceous, longer than the corol- 

 la ; Ifts. narrow-obovate, (j) A low plant, abundant in dry, sandy fields. Stems 

 much branched, round, hairy, 6 12' high. Leaves hairy, on short petioles, 

 of 3 narrow leaflets, 1' long. Stipules ovate-lanceolate, acute, often red. 

 Heads of white or pale red flowers, spiked, g !' long, very soft and downy, 

 the slender, equal calyx teeth being densely fringed with fine, silky, reddish 

 hairs, and projecting far beyond the corolla. Jl. Aug. Common in N. Eng. 



5. T. PRATENSE. Common Red Clover. (Fig. 43, 7.) 



Spikes dense ; sts. ascending ; cors. unequal ; lower tooth of the calyx lon- 

 ger than the four others, which are equal ; Ifts. oval, entire. (g) This is the 

 common red clover, so extensively cultivated in grass lands, with herds-grass 

 (Phleum pratense} and other grasses, and often alone. Stems several from the 

 same root, hairy. Leaves ternate, the leaflets ovate, lighter colored in the cen- 

 tre, entire and nearly smooth. Stipules ovate, mucronate. Flowers red, in 

 short, ovate spikes or heads, sweet-scented. Corollas monopetalous. Flowers 

 all summer. 



6. T. MEDIUM. Zig-Zag Clover. 



St. suberect, branching, flexuous, nearly glabrous ; Ifts. oblong or ellipti- 

 cal, subentire ; stip. lanceolate, acuminate ; hds. of fls. ovoid-globose, peduncu- 

 late ; col. teeth setaceous, hairy. 7J. In meadows, Danvers, Mass. Oakes. Heads 

 of flowers larger than in T. pratense. Corollas deep purple. Leaves of a uni- 

 form green. 



7. T. INCARNATUM. Fksh-colored Clover. St. erect, flexuous ; Ifts. ovate- 

 orbicular, obtuse or obcordate, sessile, crenate, villous ; spikes dense, oblong, 

 obtuse, leafless ; cal. teeth setaceous, villous. (I) A fine species from Italy, oc- 

 casionally cultivated as a border flower, and has been proposed (Dr. Dewey, 

 Rep. Herb. PI. Mass.) for cultivation as a valuable plant for hay. 



* * * Heads not involucrate. Flowers never deflexed, yellow. 



8. T. PROCUMBENS. Yellow Clover or Trefoil. 



St. procumbent or ascending ; Ifts. obovate-cuneate, or obovate-orbicular, 

 obtuse or retuse, denticulate, terminal one petiolulate ; stip. ovate-lanceolate, acu- 

 minate, much shorter than the petioles ; hds. small, subglobose, on shortish pe- 

 duncles ; cor. yellow ; sty. 3 or 4 times shorter than the 1-seeded legumes. 

 In dry soils, N. H. ! to Va. Stems many from the same root, slender, more or 

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