326 
THE DICTIONARY OF GARDENING, 
Disa—continued. 
successfully for many years, and then having suddenly 
failed. This is often brought about after a lengthened 
period of dry weather. Thrips play hayoc in a season of 
this description, and as an abundance of ventilation is 
necessary under such conditions, these pests thereby obtain 
free access to the house and quickly attack the tender 
shoots, disfiguring and often destroying them. Fumiga- 
tion is naturally resorted to, but the remedy is worse than 
the disease, and many fine batches of plants have thus 
been destroyed. No apparent ill-effects will be observed 
for a few days, but suddenly a black spotting appears on 
the leaves, and this passes into the stems, and continuing 
Fic. 346. DISA GRANDIFLORA. 
a downward course finally ends in the total decay of the 
growths. If the tubers escape injury (which is rarely the 
case) they commence growing again after a short period, 
but it takes a considerable time for plants thus weakened 
to regain their vigour. Where Thrips are observed the 
plants should be frequently sprayed overhead with 
weak tobacco-water or some non-injurious (so far as the 
plants are concerned) insecticide, or the plants may be 
dipped ; but in this case great care must be taken, as the 
growths are so brittle that they quickly break shonld 
they come in contact with the sides of the bath. 
Disa—continued. 
To the species described on pp. 483-4, Vol. I. the 
following should be added : 
D. atropurpurea (dark-purple).* fl. rich purplish-lake, solitary, 
on alee peduncles 3in. to 4in. high ; dorsal sepal hooded, with 
a very short, knob-like spur, the lateral ones elliptic-lanceolate, 
acute; petals auricled at base, bifid at apex; lip with a distinct 
stalk din. long, and a cordate, acuminate, wavy-margined blade, 
having two or three teeth on each side. J. linear, Grass-like. 
South Africa, 1885. A beautiful little plant. (B. M. 6891.) 
D. Cooperi (Cooper's). _/l. strongly Clove-scented; dorsal sepal 
pale, attenuated into a long horn, the lateral ones pink, reflexed ; 
pee dolabriform, retuse; lip greenish-yellow, broadly ovate ; 
racts large, tipped with chestnut-red at apex; spike robust, 
many-flowered. February. J. narrowed to the petioles. Natal. 
(B. M. 7256 ; G. C. 1892, xii., p. 268, f. 45.) 
D. crassicornis (thick-horned). The correct name of D. 
megaceras. 
D. graminifolia (Grass-leaved). fl. bright azure-blue; dorsal 
sepal having an acute, erect helmet, and a short spur; the lateral 
sepals obtuse; lip obtuse, toothed at apex, alternately striped 
with white and reddish-violet on the disk; column tipped with 
reddish-violet ; scape erect, few-flowered, with numerous bracts. 
1. few, cylindrical, filiform, appearing after the flowers. A, 14ft. 
Ray Seams 1825 and 1888. (J. L. S. xix., t. 34; W. O. A. ix., 
t. 399. 
D. incarnata (flesh-coloured). (. orange-red (but probably vary- 
ing), lin. across; spur of the dorsal ae as long as the blade; 
petals dimidiate-ovate; lip narrow-linear, deflexed; bracts 
spathe-like ; spike rather dense. April. J. elongated-linear. 
Stem leafy. Madagascar, 1892. (B. M. 7243; G. C. 1892, xi., 
p. 619, f. 88; G. M. 1892, p. 157.) 
D. lacera (torn). jl. blue or white; upper sepal helmet-shaped, 
with a short spur, the side ones somewhat boat-shaped ; lip 
with an abruptly-hooked apical part, lacerated, or fringed at 
the apex only, or nearly or quite entire ; stems 10in. to 12in. high, 
leafless. J. linear-filiform. South Africa, 1826. 
D. 1. multifida (much-cleft). 1. violet outside, blue within ; lip 
more or less fringed from base to apex. 1888. (B. M. 7066; G. C. 
1888, iv., p. 664, f. 93.) 
D. macrantha is synonymous with D. crassicornis. 
D. megaceras. The correct name is D. crassicornis. 
D. nervosa (nerved).* ji. bright rose-coloured, disposed in 
racemes, and borne on erect scapes 2ft. high; segments 
spreading ; spur straight, about lin. long. U. strap-shaped. Natal, 
1894. A handsome species. (G. C. 1894, xvi., p. 508, f. 41.) 
D. pulchra (pretty). jf. pale lilac and purple, 2in. across ; spur, 
including the base of the perianth tube, 2in. long ; raceme erect, 
pie LODE: Stems 2ft. long, leafy. Tubers large. South Africa, 
D. racemosa (racemose). /. light purple, marked white, dark 
purple, and green; middle sepal rhombic, the lateral ones oblong ; 
etals cuneate-triangular, serrated on the upper margin, with 
inflexed apex ; lip rhombic-lanceolate, narrow, small ; inflorescence 
one-sided, about six-flowered. 1887. (B. M. 7021; G. C. 1887, 
iii., p. 593, f. 81; Gn., 1891, p. 10, t. 786; J. H. 1888, xvii., p. 221, 
f. 25; W. O. A. viii., t. 356.) Syn. D. seeunda. 
D. sagittalis (sagittate). 1. pale lilac, with red streaks on the 
petals and lip, about gin. long, disposed in a somewhat corymb- 
like raceme. May. J. radical, 2in. to 4in. long, oblanceolate, 
bright green. Stems 6in. to 8in. high, dark brown. Tuber 
fusiform. South Africa. (B. M. 7403.) 
D. secunda (side-flowering). A synonym of D. racemosa. 
D. tripetaloides (‘three-petal-like). . creamy-white, flushed 
with pale pink and dotted with crimson, lin. across, fifteen to 
thirty in a rather loose raceme; lateral sepals rather large ; 
etals faleate; lip linear-oblong ; scape erect, clothed below with 
large bracts. J. rosulate, lanceolate, acuminate, shining, coria- 
ceous. South Africa, 1889. (B. M. 7206; G. C. 1890, vii., p. 768, 
f. 127; W.0O. A. x., t. 462.) 
The following species are also grown at Kew, but are rarely met 
with: D. chrysostachya, D. Draconis, D. rosea, D. rufescens. 
Appended is a list of hybrid Disas, with their recorded 
parentage, 
Diores ... . Veitchit and grandiflora (Veitch). 
Diores Clio . grandiflora and Veitchii (Veitch). 
KeWeTGra! Bc cissiaslew ieee grandiflora and tripetaloides (Kew). 
Tangleyensis.... 2.0.0.2 racemosa and tripetaloides (Veitch). 
Tea GaP S5en ad nd deoeue tripetaloides and Veitchii (Kew). 
Vettehtt.. <0 occ ec ene oe . grandiflora and racemosa (Veitch). 
et ee A synonym of Hierochloe (which 
see). 
DISCANTHERA. A synonym of Cyclanthera 
(which see). 
DISCANTHUS. A synonym of Cyclanthus (which 
see). 
