DIS 



[ 302 ] 



DOL 



Stove evergreen trailers, with white flowers. 

 Cuttings in sandy soil, in heat, any time in the 

 spring and summer months ; sandy loam. Sum- 

 mer temp., 60 to 80; winter, 48 to 55. 

 D. Bengale'usis (Bengal). 1$. September. India. 

 1819. 



nummulft'ria (moneywort-leaved). . August. 



Ambcyna. 



DISEASES. The morbid affections to 

 which the vegetable part of the creation 

 are liable, are almost as numerous as 

 those which render decrepid and de- 

 stroy the animal tribes. The smut 

 which ravages our corn crops; the mil- 

 dew which destroys our peas ; the curl 

 infecting our potatoes; the ambury, or 

 club root, to which our turnips and other 

 species of cabbageworts are liable ; the 

 shanking, or ulceration, which attacks the 

 stalks of our grapes, are only a few of 

 the most commonly observed diseases to 

 which the plants we cultivate are liable. 



Disease is the negation of health ; and 

 as the health of a plant is the correct 

 performance of its functions, disease 

 may be denned to be an incorrect per- 

 formance of the functions. 



Such incorrectness arises from the 

 vital energy declining in consequence of 

 old age ; from parasites ; from wounds ; 

 from food improper either in quality or 

 quantity ; and from unfavourable tempe- 

 rature. If all these could be avoided, a 

 plant might enjoy a vigorous immortality. 

 Sach, however, is not the lot of any 

 organized being, and we note them chiefly 

 to remind the gardener, that in propor- 

 tion as he can save any plant from such 

 unfavourable circumstances, will it enjoy 

 health, and length of vigorous life. 



BISE'MMA. (From dis, double, and 

 stcmma, a crown ; referring to the double 

 coronet, or rays. Nat. ord., Pnssinnworts 

 [Passifloracese]. Linn., IG-Monadelphia 

 2-Pentandria. Allied to Tacsonia.) 



Greenhouse evergreen climbers, from New Hol- 

 land. Cuttings of young shoots in summer, in 

 sandy soil, under a glass, and in gentle bottom- 

 heat ; peat and loaui. Winter temp., 45 to 50. 

 D. adiantifo'lia (adiantum-leaved). 20. Orange. 

 July. 1/92. 



aura'ntia (orange). 15. White, red. July. 



Herbertia'na (Herbert's). 30. Green, white. 



July. 1821. 



DISOCA'CTUS. (From dis, twice, isos, 

 equal, and caclos ; the divisions of the 

 petals and sepals equal, and twice two, 

 and the habit of a Cactus. Nat. ord., 

 Cactusworts [Cactacese]. Linn., 12-Jco- 

 nandria \-Monocjynia. Allied to llhip- 

 salis.) 



This curious plant forms the connecting: link 

 between the Epiphyllum and Rhipsalis section* 

 of the order, but, in general appearance inclines 

 much more to Rhipsalis. Stove evergreen. 

 Cuttings after fresh growth has commenced ; 

 also seeds ; turfy loam and leaf-mould, with sand 

 and broken pots, to keep the compost open. Sum- 

 mer temp., 60 to 85, with moisture; winter, 48 

 to 55, kept rather dry. 



D. bifo'rmis (two-formed). 2 J. Pink. Hondura. 

 1839. 



DISPE'RIS. (From dis, double, and 

 pera, a pouch; from the form of the 

 perianth's outer segments.) 



A genus of ground, or terrestrial orchids, natives 

 of the Cape of Good Hope. Division ; peat and 

 loam, with a little sand and charcoal. Summer 

 temp., 60 to 80 ; winter, 45 to 50. 

 D. Cape'nsis (Cape), f. Scarlet. July. 1816. 



cuculla'ta (hooded). f. Purple. June. 1822. 



secu'nda (side-flowering). |. Purple. June. 



1799. 



DI'SPORUM. (From dis, double, and 

 poros, a pore; application not stated. Nat. 

 ord., Melanths [Melanthaceae]. Linn., 

 Q-PIexandria \-Monogynia. Allied to 

 Uvularia.) 



Half-hardy herbaceous plants. Division of the 

 roots in spring ; also by seeds, sown under glass, 

 in April ; peat and loam, most of the first ; re- 

 quire a cold pit in winter. 



D.fu'luum (t&vfny-flowered). Ij. Brown. Oc- 

 tober. China. 1801. 



parviflo'mm (small-flowered). 3* Yellow. 



July. Nepaul. 1820. 



DITTANY. Dicta'mnns. 



DITTANY OF AMORGOS. Ori'yanum 

 Tourncfo'rtii. 



DITTANY OF CRETE. Ori'ganum dic- 

 ta'mnns. 



DODDER. Cu' scuta. 



DODECA'THEON. American Cowslip. 

 (An ancient name applied by Pliny to 

 a plant having a leaf like a lettuce. Nat. 

 ord., Primeioorts [Primulaceae]. Linn., 

 5-Pentandria \-Nonogynia. Allied to 

 Cyclamen.) 



Hardy herbaceous perennials, from North 

 America. Dividing the roots ; sandy loam. 

 D. integrifo'lium (whole-leaved). . Light pur- 

 ple. April. 1829;. 



Mea'dia (Meadia). 1. Light purple. May. 



1744. 

 albiflo'rum (white-flowered). 1. White. 



May. 1824. 

 eflegans (elegant). 1$. Rosy. May. IS?;. 



gipa'nteum (gigantic). 2. Lilac. May. 



181Q. 

 lilaci'num (\\\&c-flowered). 1. Lilac. 



DOG-BERRY- TREE. Co'rnus sangui'nea. 

 DOG BRAMBLE. Ei'bes cyno'sbati. 

 DOG'S BANE. Apo'cynum. 

 DOG'S-TOOTH VIOLET. Erythro' Kinm. 

 DOGWOOD. Co'rnus. 

 DO'LICHOS. (From dollkos, long; re- 



