480 



THE DICTIONARY OF GARDENING, 



Dipoadi continued. 



Africa, and East Indies. Flowers greenish or yellowish ; 



raceme simple, sparsely flowered; pedicels short, brac- 



teate at base. They require a compost of light sandy 



loam and leaf mould ; the roots must be kept dry during 



winter. Propagated by offsets, in spring. 



D. Balfonrli (Balfour's). Jl. greenish-yellow, nearly lln. long ; 

 racemes loosely ten to twelve-flowered, 6in. to 9m. long ; scape 

 green, terete, 2ft. to 3ft. long. September. I. three to four, 

 ensiform, sub-erect, about 1ft. long and lin. broad, h. 2ft. 

 Socotra, 1880. 



D. glaucum (grey -leaved), fl. , corolla of a greenish tawny colour, 

 glaucous or clouded with a grey bloom or hoar on the outside, 

 almost lin. long, tubularlv campanulate ; segments oblong, ob- 

 tuse; raceme long, spiked, many-flowered, irregularly and dis- 

 tantly scattered ; scape upright, scarcely flexuose, 2ft. to 3ft. high ; 

 peduncles straight, two or three times longer than the flower. 

 August. 1. upright, lorately oblong, lanceolate, glaucous, like the 

 rest of the plant, flat, convolute, and sheathing at their base. 

 h. 2ft. to 3ft. Cape of Good Hope, 1814. SYN. Uropetalon glaucum 

 (under which name it is figured in B. B. 156). 



D. serotina (late-flowering), fl. brown-coloured ; racemes many- 

 flowered ; scape bending ; corolla cernuous, cylindric-campanu- 

 late, six-partite for more than three-fourths of the length ; seg- 

 ments linear-oblong, equal ; outer ones acute, patent ; inner more 

 obtuse, partly coherent. June. I. nearly the length of the scape, 

 alternately linear, channelled, h. 9in. Spain. SYN. Seilla serotina 

 (under which name it is figured in B. M. 859). There is a variety 

 of this with pinkish flowers, D. . fulvum (figured in B. M. 1185). 



D. nmbonatum (umbonate). This species is closely allied to 

 D. Welvritschii, but differs from that by its smaller and differently- 



shaped bulb, larger bracts, more numerous and shorter flowers, 

 and differently -shaped ovary. Cape of 

 SYN. Uropetalum umbonatum. (Ref. B. 17.) 



D. Welwitschii (Welwitsch's). //. green throughout, at first 

 cernuous, finally erecto-patent, the inner segments of the perianth 

 connate at the edges, shortly patulous at the tips, the outer seg- 

 ments reaching down within Jin. of the base, the outer third 

 reflexed, the tip cylindrical ; raceme secund, four to six-flowered, 

 3in. to 4in. long ; scape 1ft. long, erect, slender, terete, glaucous- 

 green, naked. I. linear, about two lines broad, equalling or 

 slightly exceeding the scape, sheathing it at the base, flat up- 

 wards, recurved, fleshy in texture, minutely ribbed, glaucous- 

 green, naked, h. 1ft Angola, 1867. This species succeeds well 

 if grown exposed to the light in a cool greenhouse. SYN. Uro- 

 petalum Welwitschn. (Ref. B. 16.) 



DIFHACA. See Ormocarpum. 

 DIPHYLLEIA (from dis, double, and phyllon, a 

 leaf ; in allusion to each stem of the plant bearing only 

 two alternate leaves). OBD. Berberidece. A pretty hardy 

 herbaceous perennial. It thrives best in peat borders 

 and edges of beds of American plants, in moist spots. 

 Propagated by divisions, in spring. 

 D. cymosa (cymose).* Umbrella Leaf. fl. white, disposed in 



large loose heads or cymes. Summer. Berries blue, roundish. 



1. two, alternate, large, kidney - shaped, usually profoundly 



lobed at the apex. A. 1ft. North America, 1812. (B. M. 



1666.) 



DIFHYSA (from dis, twice, and physa, a bladder; 

 in reference to the legume, which is furnished with a 

 large membranous bladder on each side). OBD. Legu- 

 minosae. A genus containing four species of orna- 

 mental stove evergreen trees or shrubs, often glandular, 

 all natives of Central America. The soil best adapted 

 to them is one composed of sandy loam and fibry peat. 

 Propagated by cuttings, made from young shoots, and 

 placed in sand, in a mild bottom heat. 



D. carthagenensis (Carthagenian). /. yellow ; peduncles axil- 

 larv, two to three-flowered. 7. impari-pinnate ; leaflets five pairs. 

 h. 6ft. to 10ft Carthagena, 1827. A small unarmed tree. 



DIPIiACUS (from dis, two, and plakos, a placenta; 

 placenta separated into two parts). OBD. Scrophularineoe. 

 A genus of half-hardy evergreens, now referred to 

 Mimulus, from which it differs in the plants being more 

 woody at the base. 



DIPLADENIA (from diploos, double, and aden, a 

 gland ; referring to the presence of two gland-like pro- 

 cesses on the ovary). OBD. Apocynaceoe. Very orna- 

 mental stove evergreens. Flowers usually rose or purple, 

 showy. Leaves opposite, entire. Among stove twiners, 

 there are few more deserving of general cultivation than 

 these, as the large flowers of some of the species and 



Dipladenia continued. 



hybrids are unrivalled for brilliancy of colour, especially if 

 the plants are allowed free root room, in a prepared border. 

 They are also well adapted for exhibition purposes, in 

 which case it will be necessary to cultivate in large pots, 

 to admit of removal. When in flower, and well grown, 

 Dipladenias, in either of these positions, must be classed 

 amongst the most beautiful of stove plants. 



Propagation is effected by cuttings of the young shoots 

 that are produced when the plants commence new growth, 

 in spring. These, or single eyes, should be inserted in 

 a compost of equal parts sand and peat, covered with 

 a bell glass, and placed in a brisk bottom heat. Boots 

 will soon be emitted, and the young plants may then be 

 transferred to separate pots, grown on, and shifted into 

 larger sizes as required. 



After - Cultivation. This will consist chiefly in sup- 

 plying plenty of heat and moisture in the early part of 

 the season, and in thoroughly ripening the main growths 

 in autumn for the succeeding year. A suitable compost 

 is fibry peat, broken up roughly for use, with sufficient 

 silver sand added to insure the free passage of water. 

 Drainage must also be efficient, as few flowering subjects 

 show the effects of a waterlogged soil quicker than do 

 these. Young plants should be grown on without stop- 

 ping, and be supported by a stake until of sufficient size 

 to be placed on a trellis. This is best made of small 

 galvanised wire, and a conical or globular form is most 

 suitable. If intended for planting out, to train on the 

 roof of a stove a position best suited for showing the 

 flowers of Dipladenias the trellis will be unnecessary, as 

 the plants may be trained upright until established, and 

 then placed out permanently. If a little bottom heat 

 can be obtained, it will be of material assistance. The 

 flowers are produced in profusion all the latter part of 

 the summer, on the wood of the current year. Nearly 

 all this should be removed when the flowering season 

 is over, unless required for main shoots to cover the 

 trellis. Dipladenias should be kept warm and in a 

 moderately dry condition when at rest in winter, gradu- 

 ally introducing more moisture to start them in spring. 

 Plenty of heat and frequent syringings, in early summer, 

 will encourage the production of good flowering wood. 

 The plants are subject to the same insect pests as many 

 others grown in the high temperature of a stove. 

 When insects are detected, sponging the leaves and 

 stems will prevent their increase, and is the best method 

 of destruction. 



D. amabilis (lovely).* fl. rosy-crimson, borne in clusters, very 

 large, 4in. to bin. in diameter ; petals very round and stiff. May to 

 September. I. shortly stalked, oblong-acute, h. 10ft. A very fine 

 hybrid between D. crassinoda and D. splendens. (F. M. 309.) 



D. amcena (pleasing).* fl. pink, suffused with rose, somewhat re- 

 sembling D. splendens, but much finer ; petals round, stiff, and 

 not reflexed. I. oblong-acuminate. Garden variety. This valu- 

 able plant flowers as freely as D. amabilis, and has better foliage 

 than that plant. 



D. boliviensis (Bolivian).* fl, white, about 2in. across, with a 

 golden-yellow throat ; racemes sub-terminal or axillary, three or 

 four-flowered. I. oblong, acuminate. Stems slender. Bolivia, 

 1866. A very pretty small growing species. (B. M. 5783.) 



D. Brearleyana (Brearley's).* fl. opening pink, and changing 

 to the richest crimson, very large. I. opposite, oblong, acute, 

 dark green. A garden hybrid, of great beauty, and of the most 

 floriferous character. 



D. carissima (choicest).* fl. of a soft delicate blush-pink, with 

 an open throat, marked opposite the centre of the oblique 

 limb-segments by radiating lines of bright rose, about 5in. in 

 diameter. Garden variety. See Fig. 674, for which we are in- 

 debted to Mr. Wm. Bull. (F. & P. 1879, 502.) 



D. crassinoda (thick-jointed), fl. rose-coloured, of a very lovely 

 shade. I. oblong-lanceolate, h. 10ft. Rio Janeiro. An old and 

 well-known stove plant, now superseded by more showy sorts. 

 SYN. D. Martiana. (B. R. 30, 64.) 



D. C. Houtteana (Houtte's). An improved variety of the pro- 

 ceding, with beautiful rose-coloured flowers, having an orange- 

 coloured throat. 



D. delecta (choice), fl. of a very pretty shade of rosy-pink, 

 finely formed, and of good substance ; mouth encircled with deep 



