ST. JOHN'S WORT. 48 



II. Trailing St. John's Wort (H. humifrisuin). Stems slender, compressed, pros- 

 trate, not exceeding a foot. Leaves small, oblong ; glands pellucid ; the margins 

 are often marked with black glands, and are sometimes rolled back. Flowers, 

 inch across. Sepals unequal. Styles very short. Commons and wastes. July 

 and August. 



III. Small Upright St. John's Wort (H. pulchrum"). Stems slender, round, 

 smooth, erect. Leaves heart-shaped, with pellucid glands. Sepals small, oblong, 

 with black glandular teeth. Petals yellow, tinged with red, and edged with black 

 glands. Styles short ; anthers red. Flowers | inch, loose panicles. Dry woods 

 and heaths. June and July. 



IV. Hairy St. John's Wort (H. hirsututri). Stem erect, round, downy. Leaves 

 large, with short stalks \ downy beneath, pellucid glands. Sepals very narrow, half 

 length of petals, with black glandular teeth. Woods and thickets, especially on 

 chalk. July and August. 



V. Tutsan (H. androsamutri). Stem shrubby, compressed, 2 feet high. Flowers 

 few, f inch across. Sepals unequal, glandular, except margin. Petals and stamens 

 not permanent. Stamens in five bundles. Styles shorter than stamens. Hedges 

 and thickets. July to September. 



Clovers (Trifolium). 



Everybody knows a Clover when he sees it ; it is therefore 

 unnecessary to take up our space with a general description, 

 Their great value as pasture plants has caused their typical 

 forms of flower and leaf to be well known ; but we have so 

 many native species, to say nothing of the introduced kinds, 

 that few besides botanists ' and agriculturists are acquainted 

 with their specific characters. 



All the Clovers or Trefoils are Leguminous plants, and the 

 structure of the individual flower is very similar to that of 

 Lotus and Vicia ; but the flowers are much smaller, and are 

 gathered into a conspicuous head. In certain species there 

 are floral bracts, and in some these form an involucre. It is 

 characteristic of most of the clovers that when the seed is set 

 the petals do not fall off, but simply dry up and wrap round 

 the pod. The name of the genus is Latin, and signifies three- 

 leaved. The principal British species are : 



I. Subterranean Trefoil (T. subterraneuni), so called from its singular habit of 



