166 THE PEAFLOWEB TEIBE. 



4. SulphTir Clover. Trifoliuia ochroleuciuu, Linn. 

 (Eng. Bot. t. 1224.) 



A perennial, with the habit and foliage, as weU as the inflorescence of the 

 pvirple C, and the same sized flowers, but the leaflets are usually rather 

 narrower, the flower-heads more ovoid, and the flowers cream-coloured, with 

 rather shorter teeth to the calyx, the lowest tooth twice as long as the 

 others. 



In pastures, dry meadows, and open woods, in central and southern 

 Europe to the Caucasus, bnt not crossing the Baltic. In Britain, confined 

 to a few of the eastern counties of England. Fl. summer. 



5. Purple Clover. Trifolium pratense, Linn. 



(Eng. Bot. t. 1770.) 



Stock usually perennial, but of few years' duration. Stems decumbent or 

 nearly erect, 1 to 2 feet long, and hairy. Stipules rather large, ovate, veined, 

 with long green points. Leaflets obovate or obcordate. Flowers of a red- 

 dish purple, about 6 Unes long, in dense terminal, ovoid, or globular heads, 

 with 2 sessile, trifoholate leaves close at their base, or very rarely the heads 

 are shortly stalked above them. Calyx-teeth subulate and hairy, the lowest 

 longer than the others. After flowering tne petals turn brown, the calyx 

 remains erect, enclosing the pod, which has usually a single seed. 



In meadows and pastures, throughout Europe and central and northern 

 Asia, from the Mediterranean to the Arctic Circle, ascending high up into 

 mountain regions. It has however been so long cultivated, that in some 

 locahties it may not be truly indigenous. Abimdant in Britain. FL the 

 whole summer. 



6. Zigzag Clover. Trifolium medium, Linn. 



(Eng. Bot. t. 190.) 



Very much resembles the purple C, and may be a mere variety. It is 

 a handsomer plant, with narrower stipules and leaflets ; the heads of flowers 

 are always more or less pedunculate above the last floral leaves, and the 

 corolla rather larger, of a brighter and richer colour. The zigzag stem is 

 not a very constant difierential character, and even the pedunculate flower- 

 heads may be occasionally observed also in the purple C. 



In open woods, bushy pastures, on banks and roadsides, in northern 

 and central Europe, and across Russian Asia, becoming a mountain plant 

 in southern Europe. Generally spread over Britain, but more common in 

 southern Scotland and northern England than further north or south ; 

 extends also into Ireland. Fl. summer. 



'7. Sea Clover. Trifolium maritimum, Huds. 

 (Eng. Bot. t. 220.) 



An annual, with spreading or decumbent stems, seldom above afoot high, 

 and more slender than the three last, with much smaller flowers. Stipules 

 long and narrow. Leaflets narrow- obovate or oblong. Flower-heads at 

 first globular, then ovoid, shortly pedunculate above the last leaves. Calyx- 

 teeth at first subiilate, the lower one longer than the others, but all much 

 shorter than in the purple C, and after flowering they are somewhat en- 

 larged, stiff', and slightly spreading. Corolla pale pink, rather longer than 

 the calyx. 



In salt-marshes and rich meadows near the sea, in southern and western 



