DIERVILLA 489 



shrubs than the Asiatic Diervillas. The first of them, D. florida (or 

 Wiegela rosea), was introduced in 1845. Afterwards other species were 

 introduced and hybridising was commenced, with the result that a very 

 fine race of garden varieties has been produced showing great variety of 

 colour, from white and yellowish white to deep rose and blood-red. 

 These now surpass the original species in effectiveness, and the latter 

 are becoming scarce. The separation and identification of some of the 

 Asiatic species is not easy. D. Middendorffiana, however, is readily 

 distinguished by its yellow flowers and two-lipped calyx; D. floribunda, 

 by its crimson or blood-red flowers ; D. praecox, by its early flowering. 

 The three others may be differentiated as follows : 



D. florida. Lobes of calyx lanceolate, penetrating only half or about half its length ; 



stigma bilobed ; seeds not winged. 

 D. japonic a. Lobes of calyx narrow linear, extending to the base ; seeds winged ; leaves 



very downy ; calyx and corolla more or less so. 

 D. grandiflora. Lobes of calyx as in japonica ; leaves downy chiefly on the midrib and 



veins beneath ; corolla smooth ; calyx fringed on the margin. 



The Diervillas are easily cultivated, and there are only two, D. 

 Middendorffiana and D. japonica hortensis, that show any indication of 

 tenderness. Being gross feeders they need a rich, moist, loamy soil. 

 They are very easily increased by cuttings of half-ripened growths. The 

 Asiatic species should be pruned as soon as the flowers are past, by 

 entirely removing the old shoots that have flowered a process of 

 thinning leaving the young shoots of the year untouched, to produce 

 their crop the following year. The American species, D. Lonicera, 

 sessilifolia, and rivularis, may be pruned back in spring before growth 

 commences. 



The garden varieties are too numerous to mention, but besides 

 those alluded to under their respective species, the following may be 

 recommended : 



Abel Carriere. Flowers rose-carmine, changing to red ; yellow in the 

 throat. A very vigorous and ornamental shrub. 



Conqnete. Flowers large, deep pink. 



E. Andre. Flowers very dark brownish crimson. One of the 

 floribunda group. 



Grceneivegeni. Flowers deep rose outside, pale within, with yellowish 

 lines. 



Madame Lemoine. Flowers white, changing to deep blush. 



In several Diervillas the flowers open pale and deepen in colour later, 

 so that various shades are seen on the same plant simultaneously. 



D. FLORIBUNDA, Siebold. 



A shrub 4 to 8 ft. high, with slender, supple branches clothed with soft 

 hairs. Leaves ovate or oval with long, tapering points, wedge-shaped at the 

 base ; 3 or 4 ins. long, and about half as wide on the long, barren, first-year 

 shoots, considerably smaller on the lateral flowering twigs ; toothed, downy 

 on both surfaces, especially beneath. Flowers produced during June in 

 corymbs terminating, and in the leaf-axils of, the short side twigs. Corolla 



