156 BRITISH BOTANY. 



A. 6. C. 13. Lat. 50-53°. Alt. 0. Tern. 52-49°. 



Stems spreading^ erect or ascending (often prostrate), branch- 

 ing; the upper or lateral branches surpass the primary axis. 

 Leaflets oblong or obovate (linear-elliptical), entire or only feebly 

 toothed at the apex ; stipules herbaceous, linear, acute. Heads 

 ovate, solitary, usually pedunculate, but sometimes sessile, mostly 

 terminal. Calyx-tube obconical, the throat enclosed by two la- 

 teral callosities, like two lips ; divisions of the calyx herbaceous, 

 lanceolate-acuminate, finally dilated and spreading. 



Muddy salt-marshes. Annual ; June- August. 



In the common form the divisions of the calyx are unequal. 

 There is a variety in which the divisions are equal, viz. T. Xa- 

 tardii, DC? This form has been collected at Wandsworth Steam- 

 boat Pier. 



T. subterraueum, L. Subterraneous {underground) Trefoil. 

 — E.B. 1048. L.B.s. 268. 



A. 8. C. 35. Lat. 50-54°. Alt. 0-100 yds. Tern. 53-48°. 



Stems stout, hairy or woolly, prostrate, much branched. 

 Leaves obovate, cuneate, slightly toothed, pubescent on both 

 sides; stipules herbaceous, ovate, pointed. Flowers yellowish- 

 white (cream-coloured), usually 3 together, on stout peduncles, 

 which are mostly shorter than the petioles. Calyx of the fertile 

 flowers enlarged by the legume, and surrounded by the barren 

 calyxes, the teeth of which are refracted and radiated, and form 

 a kind of cage, enclosing the legume and fixing it to the soil, 

 in which it is naturally buried after the flowering of the plant. 

 Standard of the corolla striated with reddish streaks : both it 

 and the wings are much larger than the calyx. Legume one- 

 seeded ; seed black, large, and shining. 



In open, grassy, sandy places. Annual ; May, June. 



Sect. II. — Flowers sessile or pedicelled ; teeth of the calyx glabrous or nearly so. 

 T. glomeratum, Lin. Smooth, round-headed Trefoil. — e.b. 

 1063. L.B.s. 278. 



A. 5. C. 9. Lat. 50-53°. Alt. 0-50 yds. Tern. 51-49°. 

 Root annual. Stems spreading or erect, glabrous. Leaves 

 obovate-cuneate or roundish, with wide, sharp, ascending teeth 

 and prominent nerves, glabrous on both sides ; stipules entire, 

 ovate- acute, awned, scarious. Flowers sessile, roseate, the stan- 

 dard being much longer than the wings, in round, dense, usually 

 solitary heads. Calyx glabrous, with ovate, lanceolate teeth. 



