492 DIERVILLA 



D. LONICERA, Miller. 



(D. canadensis, Willdenow ; D. humilis, Per soon ; Bot. Mag., t. 1796.) 



A spreading, suckering shrub, 2 to 4 ft. high ; young wood smooth. Leaves 

 oval or ovate-oblong, taper-pointed, usually heart-shaped at the base on 

 strong shoots, tapering on weak shoots ; 2 to 5 ins. long, i to T.\ ins. wide, 

 evenly toothed, quite smooth on both surfaces, hairy on the margin when 

 quite young ; stalk in. or less long. Cymes few-flowered, axillary and 

 terminal, produced in June and July on the current season's shoots, the 

 terminal ones three- or five-flowered ; axillary flowers often solitary. Corolla 

 yellow, becoming deeper with age, funnel-shaped, the tube i in. long, wider 

 across the five narrow lobes. Calyx smooth, with five erect, awl-shaped lobes. 

 Style and stamens hairy below. 



Native of Eastern N. America, from Newfoundland to the S. United 

 States. First brought to Europe by Dr Dierville, a French surgeon, after 

 whom the genus is named; introduced to England in 1739. It is the least 

 ornamental of cultivated Diervillas, and rarely seen outside botanic gardens. 



D. MlDDENDORFIANA, Carriere. 



(Bot. Mag., t. 7876.) 



A shrub 3 or 4 ft. high ; young shoots smooth except for two downy ridges. 

 Leaves 2 or 3 ins. long, T to i J ins. wide ; ovate-lanceolate, toothed, wrinkled, 

 slightly hairy on the margins and on the chief veins when young only ; 

 stalk \ in. or less long. Flowers in a terminal cymose cluster. Corolla 

 bell-shaped, sulphur-yellow, stained with orange on the lower lobes ; \\ ins. 

 long, I in. wide across the mouth, where are five spreading lobes. Calyx 

 two-lipped ; the upper lip with three narrow lobes, the lower one with two 

 broader, deeper ones ; all fringed with short bristles. Flowers in April 

 and May. 



Native of N. China, Manchuria, and Japan ; introduced to Europe in 1850. 

 A beautiful shrub, very distinct in its yellow blossoms and curious two-lipped 

 calyx. It does not thrive well generally in cultivation, suffering very much 

 from late spring frosts. 



D. PR^ECOX, Lemoine. 



This Diervilla was put in cultivation by Mr Lemoine of Nancy in 1894. 

 He had previously obtained it from Japan, and if not a true species it may 

 be a hybrid or variety raised in that country. It flowers in the first week 

 of May three or four weeks in advance, of its nearest allies. It is a vigorous 

 grower, the leaves of the young shoots 5 ins. long and nearly half as 

 wide, hairy, especially beneath. Flowers large, \\ ins. long, rose-coloured, 

 yellow in the throat, produced in cymes of three or five. The calyx resembles 

 that of D. florida in lobing, but is very hairy. The young stems, on the 

 other hand, are quite smooth. Except that the flowers are rather subject 

 to damage by late frost, this shrub is quite a desirable one. 



D. SESSILIFOLIA, Buckley. 



A deciduous shrub of somewhat tufted habit, 2 to 3 ft. high, with four- 

 angled young branches which are downy only on the corners. Leaves ovate- 

 lanceolate, T.\ to 7 ins. long, half as wide ; sharp-toothed, rounded, or 

 heart-shaped at the base, taper-pointed, smooth except on the midrib above, 

 stalkless. Flowers much crowded in terminal cymose clusters up to 3 ins. 

 across, or in smaller axillary ones, produced from June to August. Corolla 



