1900 SUPPLEMENT—RECENT INTRODUCTIONS, &c. 319 
Diacrium—continued. Diamond-back Moth—continuwed. 
elongated pseudo-bulb. Only one species calls for mention. | with dark brown, with a whitish ochreous inner margin. 
For its successful cultivation, it requires a light sitnation in The hind wings are grey. The larva is green, and may be 
a very moist stove. found in June, July, September, and October. Newly- 
slacked lime dusted upon the leaves in the morning has 
ae been found beneficial ; but the eultivator should endeavour 
\ by every means to so stimulate his plants that they are 
as to grow away. A peculiarity of this Moth is that it 
seems to flourish equally well in Europe, Asia, Africa, 
America, and Australasia. 
DIANELLA. The dozen species of this genus are 
chiefly Australian, but some of them extend to tropical Asia, 
the Mascarene and Pacific Islands, and New Zealand. 
To those described on p. 46, Vol. I., the following should be 
added : 
D. divaricata (divaricate). A synonym of D. revoluta. 
D. ensifolia (sword-leaved). jl. white, greenish, or bluish, din. 
to 4in. long; panicle lft. to 2ft. long, cuneiform. August. 
1., lower ones lft. to 2ft. long, Zin. to 14in. broad, linear-lanceo- 
late; sheaths long. Stem ft. to 6ft. high, rigid. Tropical 
Himalayas, 1731. (B. M. 1404.) 
D. longifolia (long-leaved). A synonym of D. revoluta. 
D. revoluta (revolute). jl. of a deeper blue than 
in D. cerulea, about 4in. long ; panicle also looser 
and more spreading. August. J. distichous and 
crowded at the base of the stem, as in D. tas- 
manica, the sheaths with prominent keels, the 
two or three outer ones with scarcely any or very 
short lamin, the inner ones with narrow, rigid 
blades 2ft. to 3ft. long, the margins closely 
revolute. Australia, 1823. Syns. D. divaricata, 
D. longifolia (B. R. 734). 
D. tasmanica variegata (variegated). A variety having leaves 
striped with yellow. 1894. 
DIANTHERA. Syn. Beloperone (in part). Of the 
eighty species included in this genns, two or three are natives 
of tropical Africa or Asia, and the rest are all tropical or 
extra-tropical American. To those described on p. 461, 
Vol. I., the following should be added : 
D. bullata (studded). 7. whitish, small, fascicled in the axils of 
the minute, opposite bracts. /. opposite, shortly petiolate, 5sin. 
to 44in. long, 2sin. to 23in. broad, elliptic, obtusely acuminate, 
slightly contracted at base, cordate, bullate between the veins, 
labrous, dark green above, purple and pubescent on the veins 
eneath. Stem terete, fuscous-purple. Borneo, 1886. Stove. 
(I. H. 1886, 589.) 
D. pectoralis (pectoral). Garden Balsam. fl. distant, in 
branched, elongated spikes, mostly one-sided ; corolla rosy with 
a variegated throat, or pale blue, sin. long. May. /. lanceolate, 
acuminate, or oblong-lanceolate, lin. to 4in. long. A. 1ft. to Sft. 
West Indies, 1787. SyN. Justicia pectoralis. 
DIANTHUS. Of the seventy true species (according 
to Bentham and Hooker) of this genus ten are found in 
South Africa, one in Siberia and North America, and the 
rest are European or North African. An exhaustive mono- 
graph of Dianthus by Mr. F. N. Williams (in which he 
describes as many as 238 species!) is published in the 
“* Journal of the Linnean Society,”’ vol. xxix. (1893). To the 
species described on pp. 461-4, Vol. I., the following should 
be added : 
D. Boissieri (Boissier’s). A form of D. sylvestris. 
D. callizonus (beautiful-zoned).* fl. pink with a purple, white- 
Fic. 342. DIACRIUM BICORNUTUM. dotted zone on ee lower part a ork Craiinite SeEaIe. Avot lin. 
across, solitary, shortly pedunculate. June. J. spreading, 
glaucous, linear or linear-lanceolate, acute or obtuse, keeled. 
D. bicornutum (two-horned). The correct name of the plant stems ni rous, leafy near the apex. Transylvania, 1889 
described on p. 512, Vol. L., as Epidendrum bicornutum. aise Peper crt M. Toe) pie Res ‘3 g 4 J 
Fig. 342. tes = F : * ayer rerpalen 
D. cinnabarinus (cinnabar-red).* jl., petals fiery-red above, paler 
DIADENIUM (from dis, twice, and aden, a gland ; in beneath, covered with sessile glands; stamens not exserted. 
allusion to the two glands at the base of the column) Syn Summer. J. narrow-linear, with very acute, rigid tips. Thessaly, 
1 = A 1888. A fine species, suffrutescent at the base. 
Chenanthe. ORD, Orchidex. A genus embracing only two 
closely-allied species of stove, epiphytal Orchids, with small 
flowers, natives of Pern and Para, and closely allied to = ae - E oon iat 
Comparettia. D. Barkeri (Sxx. Chenanthe Barkeri) has | D, diutinus (durable). 1. NS el el nea 
i i * . . . glaucous, 3in. long, linear, carinate, spreading. Stems simple, 
been introdueed, but is probably not now in cultivation. eeeeoral h, 6in. irene sania Alps and the Banat. Plant 
DIAMOND-BACK MOTH (Plutella cruciferarum). glabrous. A very rare rockery species. 
The lary of this Moth, which has an extremely wide D. Fontanesii (Fontanes’). A synonym of D. spinosus. 
geographical range, are very abundant some seasons, when | D. Freynii(Freyn’s). A variety of D. glacialis. 
they cause much damage to Cruciferous crops, but especially D. Gardnerianus (Gardner's). A variety of D. chinensis. 
to Turnips and Cabbages. Dry weather is favourable to its D. glacialis Freynii (Freyn’s). l. purple, 3in. in diameter. 
D. cruentus latifolius (broad-leaved). A synonym of D. /ati- 
‘olius. 
increase ; while wet, showery weather has an opposite I. glaucous. Bosnia, 1892. 
tendency. The Moth measures about gin. in wing expanse, D. gracilis (slender). fl. light rose-coloured, very pale beneath, 
and is in evidence in April, and agaim in August and sweetly scented, two or three on a short peduncle; petals obovate- 
September. The fore-wings are greyish-brown, spotted cuneate. J. 2sin. long, linear, acute, flat, spreading. Mount 
