Doyeuxia 



( 201 



Dianthus 



given for this method of treatment. Merely thin 

 out old shoots and shorten others from year to 

 year where necessary. 



Principal Species and Varieties :-- 



crenata, 4' to 6', Jo., Jy., puuctata, spotted, 



wh. The best flowering gracilis, 2', Ap. to Je., 



species for the open air wh. The best for pot 



("i/iix. Fortune!, sen bra. culture. 



[of Llnilli'ii], scabra foliis aureis, Ivs. yel. 



crenata, and Watered) . Leinoiuei, 2', My., Je., 



flora pleno, double, wh. wli., hybrid. 



floro pleno extus pur- scabra, G', My., Je., wh. 

 purea, wh., ro. on tlie The strongest grower, 

 outside. 



Other Species :-- 



coryinbosa, 5', wh. parviflora, 3', wh. 



discolor, wh., ro. staminea, S\ Ap., My., 



purpurascens, ro. pur. wh. 



DEYEUXIA. 



Greenhouse Grasses (ord. Graminese) grown for 

 decorative purposes. Propagation is easily effected 

 by division. Loam, leaf mould, and sand will suit 

 admirably for soil. 



Principal Species : 



elegans variegata, Ivs. 1' to Ji', deep grn., edged 

 yel. 



DIACALPE. 



A stove Fern (ord. Filices) having fronds much 

 re.-embling those of Davallia nodosa, often covered 

 with coarse hairs, which soon fall away. Propaga- 

 tion, by division. Soil, loam and peat in equal 

 proportions, with some chopped sphagnum, and 

 broken pots with sand to ensure drainage. 



Only Species : 



aspidioidos, fronds 2' to 3'. 



DIACRIUM. 



A handsome Orchid (or/I. Orchidacese), allied to 

 and often placed under Epidendrum. Propaga- 

 tion, by division of the pieces, with a leading bud 

 to each. The compost should consist of fibrous 

 peat and sphagnum, with some sand, placed over 

 an ample drainage of crocks. Keep the plants 

 well above the rim of the pots. 



Only Species : 



bicornutum, 1J', sum., wh. (xyn. Epidendrum). 



DIADENIUM. 



A stove Orchid (ord. Orchidacese) requiring 

 moist and warm treatment. Propagation, by off- 

 sets and by division of the pieces. For soil, use 

 fibrous peat and sphagnum in equal proportions, 

 with a little sharp sand. Use well-drained Orchid 

 baskets of moderate size, suspending them near 

 the glass. Keep the compost moderately dry in 

 winter, 



Principal Species :- 



Barker! (xyn. Chipnatithe Barken). 



DIALIUM. 



A small genus of stove shrubs or trees (ord. 

 Leguminosse). Propagation, by cuttings of half- 

 ripened shoots in bottom heat. Guineense may 



Decil's Apples (see Mandragora). 

 Devil in tin- Hush (s,v .\'ii//'lla). 

 Devil's Hit (itn- Kealiiimi xi/cc/wt). 

 f>i-ri/'.i Hi rb (see Plumbago scaiidens). 

 Dewberry (sec Halms <.</.-;. 



be grown in equal parts of peat and loam with 

 sand. 



DIAMOND-BACK MOTH. 



The larvae of this moth (Plutella cruciferarum) 

 prey upon cruciferous crops generally, but are 

 most troublesome to Turnips and Cabbages. The 

 moths, which make their appearance in April, are 

 about J" across the forewings ; the latter are 

 greyish white, spotted with brown. The larva; are 

 green, and do their eating all through the summer, 

 and the early part of the autumn. The moths 

 should be caught, if possible, and freshly slaked 

 lime should be dusted over the young plants while 

 the dew is on them. It is only while the plants 

 are young that they are in danger from the cater- 

 pillars ; when they get older the leaves are too 

 tough and strung. 



DIANELLA. 



Cool greenhouse plants (ord. Liliacese). Propa- 

 gation, by seeds and division. The soil may con- 

 sist of loam and peat in eqird proportions. They 

 may be planted out in cool houses. 



Principal Species : 



Gfentlttt, 2', Je. (sijn. aspera, bl. berries, 



congesta). 



Other Species : 



congesta (we ca-rulea) . revoluta, 2', Aug. (xyn. 



divaricata (nee revoluta). divaricata). 



ensifolia, l\', Aug., wh. struraosa (see Itevis). 



Isevis, 2', Aug. (XI/HS. longi- tasmanica, berries bl. 



folia and strum osa). - variegata, Ivs, striped 



lougifolia (tee Itevis). yel. 

 uemorosa, 2', Aug. 



DIANTHERA. 



Stove or greenhouse herbs (ord. Acanthaceas), 

 rarely shrubby. Propagation, by cuttings in sand 

 in heat, under a bell-glass or in a case. For soil 

 use two parts loam, one part leaf mould, and suffi- 

 cient sand to make it porous. 



Principal Species : 

 americana, 1' to 3', sum. , (XI/HX. Jacobiuia and 



vio. , wh. Beloperone ciliata). 



bullata, leaves pur. be- illustris (sir Porphyro- 



ueatli. coma lanceolata). 



ciliata, '!' ', win., pur., wh. lauceolata (we Porphyro- 

 coma lauceolata). 



DIANTHUS. (PINK.) 



Description. Very beautiful border or rockwork 

 flowers (ord. Caryophylla;), generally very fragrant, 

 and of charming form. The genus includes 

 the Carnation (Caryophyllus) and the Pink 

 fplumarius), which will be found described under 

 the popular names. There are a large number of 

 species, and only the best of those which are in 

 gardens can be named here. Barbat.us, the Sweet 

 William, is an old favourite in cottage gardens. 



Propagation. By seeds sown in pots or pans in 

 spring and placed in a frame or greenhouse. Also 

 by cuttings or layers in August. The Mule Pinks, 

 such as Napoleon III., should be cut down after 

 (lowering to induce the formation of cuttings. 



Soil. The greater number of the species like a 

 rather light and sandy soil, with the addition o a 

 little peal. 



Other Cultural Points. The Alpine species 

 generally prefer to grow in the crevices between 

 stones, and in full sun. an exposure to the south 

 or south-west suit ing them well. Alpinus, however, 



