LV. OROBANCHACE^). 321 



b*tt not always larger than the lateral ones, and all the lobes toothed 

 and wavy, although less so than in many species. The upper part of 

 the style and stamens are usually covered with short glandular hairs, 

 which are usually wanting in the lower parts. 0. Rapum, Thuill. 



On the roots of the shrubby Leguminous plants, scattered over nearly 

 the whole of Europe. Not uncommon in some parts of England, ex- 

 tending to Dumfriesshire, chiefly on Broom, more rarely on Furze, rare 

 in Ireland. PL early summer. 



2. O. caryophyllacea, Sm. (fig. 719). Clove-scented B. The colour 

 of the plant and size of the flowers are those of 0. major, but the 

 stem is seldom above 8 or 9 inches high ; the flowers are much fewer, 

 and farther apart ; the tube of the corolla is not quite so broad ; 

 the upper lobes scarcely spreading, and the lower ones nearly equal, 

 and the stamens more hairy at the base. The flowers are usually sweet- 

 scented. 



Said to grow exclusively on Oaliums; common on the continent 

 of Europe, extending across the whole of Asia In Britain limited 

 hitherto to a very few of the southern counties of England. PI. early 

 summer. 



3. O. rubra, Linn. (fig. 720). Red B. A rather smaller plant than 

 0. caryophyllacea, which it resembles in the shape of the flowers, but 

 these are nearer the size of those of 0. minor, and the whole plant 

 assumes a very red-brown colour. Calyx usually divided into 2 entire 

 sepals with narrow points, but these are sometimes again divided, 

 although very unequally, or united in front at the base, as in 0. minor, 

 and other species. 



On the roots of Thyme, in central and southern Europe. In Britain, 

 only on the basalt and trap-rocks in Scotland and Ireland. Fl. 

 summer. 



4. O. elatior, Sutt. (fig. 721). Tatt . Closely resembling 0. major 

 in stature and flowers, of which it is probably a mere variety. It 

 retains longer its pale yellow colour ; the lobes of the corolla are less 

 unequal and more toothed, and the stamens are hairy in their lower 

 part, and nearly glabrous above. 



On Centaurea and not on Leguminous shrubs ; said to be more abun- 

 dant than 0. major in eastern Europe, in Britain it inhabits chiefly the 

 eastern and southern counties, but has occurred in South Wales. FL 

 summer. 



5. O. minor, Linn. (fig. 722). Lesser B. Often small, and always 

 more slender than any of the preceding, with smaller flowers. Gene- 

 rally of a light brown or yellowish colour, with more or less of bluish- 

 purple in the flowers, although not running into the deep purple-bine 

 of the two following species. It is usually from 6 to 9 inches high, 

 although some of the larger specimens exceed a foot ; the lower flowers 

 of the spike are at some distance from each other. Segments of the 

 calyx ending in long slender points. Tube of the corolla contracted 

 in the middle, much curved ; the lobes of the limb larger in proportion, 

 and more wavy than in 0. major and 0. caryophyttacea* Stamens more 

 or less hairy in their lower part. 



One of the widest spread species over Europe and Russian Asia, 

 growing on a great variety of plants. In Britain, not uncommon in 

 southern and central England, and southern Ireland. Fl. aU summer. 



X 



