Trifolium.'] DIADELPHIA — DECANDRIA. 275 



** Legumes \-or2-seedecL Standard deciduous or unaltered. 

 Calyx not inflated^ mostly hairy. 



3. T. subterrdneum, L. (^subterraneous Trefoil); lieads lateral 

 stalked hairy of few flowers, at length deflexed and throwing 

 out from their centre thick fibres palmated at the extremity 

 (abortive calyces) which are closely bent down over the reflex- 

 ed fruit. E. Bot. t. 54. 



Dry gravelly pastures in England. Fl. May. ©. — Z — 6 or 8 inches 

 long, decumbent, hairy, with large, ovate, membranaceous stipules. 

 Flowers long and very slender, almost white. Peduncles at length 

 elongated, so that the heads of flowers reach the ground. The young 

 fruit then becomes deflexed, and from the top of the peduncle there arise 

 many thick short fibres with 5 palmated teeth at their extremity, which 

 soon become recurved over the fruit and serve to bmy it in the soil. 

 From the number of teeth terminating each of the above-mentioned 

 fibres, as well as from their comparative length and thickness, it is natu- 

 ral to conclude, with De Candolle, that the latter are abortive calyces. 

 Petals partially caducous. Legumes large, ovato-globose. 



4. T. ochroleucum, L. (sulphur-coloured Trefoil) ; heads ter- 

 minal solitary, teeth of the calyx subulate, lower one much longer 

 than the rest, leaflets elliptic or obovate, those of the lower 

 leaves heart-shaped, stem ascending downy. E. Bot. t. 1224. 



Pastures and way-sides in England, on gravel or chalk. Frequent 

 also in the clayey soil of Norfolk and SuflTolk. Fl. July, Aug. If. — A 

 foot or more high. Petioles long. Stipules subulate, libbed. Heads 

 vi^ flowers large, at first hemisphasrical, at length oval, cream-coloured. 

 The corolla turns brown and is persistent. 



5. T. pratense, L. (common purple Trefoil) ; Iieads dense ovate, 

 teeth of the calyx setaceous, lower one longer than the rest | as 

 long as the tube of the corolla, stipules ovate bristle-pointed, 

 leaflets oval or obcordate, stems ascending. E. Bot. t. 1770. 



Meadows and pastures, frequent. Fl. summer months. 11.— Flowers 

 reddish-purple. This is the common Clover, so much cultivated for 

 hay. The leaflets are oval, obovate, or obcordate, often marked with a 

 white lunulate spot. 



6. T. medium, L. (zigzag Trefoil); heads of flowers lax sub- 

 glohose solitary terminal, calyx-teeth setaceous, lower one long- 

 er than the rest about equal to the tube of the corolla, stipules 

 lanceolate acuminate, leaflets elliptical, stems branched zigzag. 

 E. Bot. t. 190. 



Pastures, frequent. Fl.h\\y.1i. — ^S^em remarkably zigzag. Heads 

 of Jioivers larger than the last, deeper purple. Leaves spotless. Inferior 

 in quality to T. pratense, but better fitted for pasture on light soils. 



7. T. maritimiim, Huds. ( Teasel-headed Trefoil); heads ovato- 

 globose stalked terminal, teeth of the calyx broad acuminate 

 rigid, the lower one much longer and larger than the rest short- 

 er than the claws of the petals, all of them at length enlarged 

 and spreading, stipules subulato-lanceolate, leaflets oblongo- 

 obovate, stem ascending. E. Bot. t. 220. 



