LEGUMINIFER^. 153 



Var. ^.parviflorum. — Heads not sessile ; calyx-teeth as long or 

 longer than the corolla. 



T. medium is distinguished from T. pratense by its round, 

 flexuous (often wiry), and solid stein, and by its more elongate 

 uniformly pale-green leaflets, by its herbaceous lanceolate stipules, 

 by its stalked heads, and by the long setaceous hairy teeth of the 

 calyx. 



T. medium, L. Zigzag Ti'efoil. — e.b. 190. l.b.s. 272. 

 A. 18. C. 75. Lat. 50-61°. Alt. 0-350 yds. Tern. 51-43°. 



Stem ascending, flexuous or zigzag, solid or nearly solid. 

 Leaflets oblong, all more or less narrowed at both ends; stipules 

 membranous, with prominent green nerves and lanceolate-linear 

 or setaceous teeth. Flowers on short peduncles, in the centre of 

 the leaves or in the axils when twin flowers are produced. Calyx- 

 throat closed when in fruit, with a hairy ring; teeth slightly 

 spreading, lanceolate-linear (filiform), 4 of them equal, one dou- 

 ble the length of the others. Fruit compressed, obovate, crowned 

 with the slender persistent style ? 



Grassy places both in woods and in fields. Perennial ; June- 

 September. 



In the Highlands this species is often very handsome. In the 

 dried-up channels of streams it is sometimes found with a round, 

 wiry, rigid stem. 



T. ochroleucum, Lin. Sulphur-coloured Trefoil. — e.b. 1224. 

 L.B.S. 269. 



A. 3. C. 9. Lat. 50-53°. Alt. 0-100 yds. Tern. 49-48°. 



Stems ascending, pubescent, round, leafy. Leaflets oblong, 

 entire, pubescent above, silky below; stipules herbaceous, the 

 free portion linear or subulate, hairy. Flowers cream -colour ; 

 heads oblong, solitary, rarely in pairs. Calyx-divisions lanceo- 

 late, hairy, spreading when in fruit. Standard much longer than 

 the wings, compressed. 



In dry, gravelly places, chiefly in the East of England. A few 

 examples have been observed growing in the station, so often 

 noticed, near Wandsworth. Perennial ; June- August. 



T.incarnatum, L. Italian Clover. — e.b.s, 2950. l.b.s. p. 15 in 

 List of Excluded Species. Alien. 



Stems hollow, erect, sulcate, very downy, 6-30 inches high. 

 Leaflets obovate-roundish or obovate-cuueate, toothed on their 

 upper part, downy on both sides ; stipxdes ovate, obtuse, mem- 



20 ' w 



