AN ENCYCLOPAEDIA 
203 
OF HORTICULTURE. 
Isotoma—continued. 
I. longifiora (long-flowered). fi. white ; tube of corolla very long 
and slender. Summer. J. obovate- lanceolate, coarsely toothed, 
pubescent. West Indies, 1752. Greenhouse perennial. A very 
poisonous plant. (B. R. 1200, under name of Lobelia longiflora.) 
I. senecioides — Sececio-like, sub-pinnatifid 
A synonym of J. axil pes memean Eea : * + 
ISOTROPIS (from isos, equal, and tropis, a keel; 
in reference to the shape of the carina). ORD. Legu- 
minose. A genus of eight species of greenhouse herbs 
or under-shrubs, with diffuse or ascending stems. 
Flowers solitary, on axillary peduncles, or forming a 
loose terminal raceme. Leaves alternate, simple or uni- 
foliolate, with linear-faleate or minute stipules. The 
species aro all Australian. I. striata, perhaps the only 
one in cultivation, requires treatment similar to Ghori- 
zema (which see). 
I. striata (striated). A., standard yellow with purple streaks, 
large ; wings and keel | agg oes Spring. /. not numerous ; lower 
ones obovate or cuneate, very obtuse, truncate or broadly two- 
lobed ; upper ones narrower, and sometimes acute. Some branches 
quite leafless and dichotomous. h. 6in. to 18in. — = rennial 
or under-shrub. — Chorizema spartioides (under which name it 
is figured in L. B. C. 1953). 
ITEA (from Itea, the Greek name of the Willow, as far 
back as Homer; applied to this genus on account of the 
- quick growth of the species named below). ORD. Saxi- 
fragee. A genus comprising about five species of trees 
and shrubs, natives of North-west America, Japan, China, 
Java, the, Himalayan Mountains, and Khasia. Flowers 
white, small. Leaves alternate, petiolate, oblong or 
lanceolate, glandulose-dentate or crenate. The only re- 
presentative of this genus yet introduced is I. virginica, 
an ornamental hardy deciduous shrub, which, when in a 
vigorous condition, during autumn, is entirely covered with 
its racemes of white flowers. It thrives best in a moist 
sandy or peat soil. Increased, in spring, by seeds, or by 
suckers; and, Pe — by layers. 
— — 
in minui 
TAR totii No ternate, imple oblong poiat P200) 
— oa Hedera. 
IXANTHUS (from Ixos, Mistletoo, and anthos, flower ; 
in reference to the glutinous nature of the flower). ORD. 
Gentianee. A monotypic genus. The species is an erect 
greenhouse biennial herb, native of the Canary Islands. 
It thrives in well- drained fibrous loam, and requires a 
light, airy place in a cool greenhouse. Propagated by 
seeds, sown in spring. 
I. viscosa corolla yellow, salver-shaped; tube 
white, po RS the ec the calyx ; limb five-cleft. June and 
July. 1. ovate-lanceolate, quite entire, three —— five-nerved ; 
u ones often connate. Branches o0; . Stem 
— Ah. lft. to 1)ft. Canaries. eB M e under 2 under name of 
Gentiana viscosa.) 
IXAUCHENUS. A synonym of Lagenophora 
(which see). 
IXIA (from ivia, the Greek name used by Theo- 
phrastus for birdlime ; referring to the clammy juice). 
Syn. Wiirthea. Including Morphivia. ORD. Iridew. 
‘A genus containing about twenty-five species of pretty 
greenhouse (or hardy in sunny, shi dry spots, in 
the extreme south of Britain) bulbous plants, all natives 
- of South Africa. Flowers in simple or branched spikes ; 
perianth tube long, slender; limb regular, salver-shaped. 
Leaves narrow, ensate. Stems —— — or —— 
branched. Propagation is readily effec y seeds; or 
by offsets, — freely produced. Seeds should be 
sown in pans of sandy soil, about September, and placed 
in a cool frame. The young plants may remain in the 
seed-pans for the first year, when they should be either 
potted singly or planted out. It takes from three to 
four years before they flower. By growing a number of 
_ Varieties together, and saving their their seed, numerous other 
sorts may be obtained, usually much varied in colour, | 
and in the markings of the flower. Propagation by 
` tory and cool greenhouse decoration, in early summer. 
e fucata (painted). A. pink, salver-shaped ; tube clavate, straight; 
E p leucantha — 
ulate ; stigmas lo! 
Te 1778. (B. M. 
Ixia—continued. 
offsets is a much quicker method, as the plants then 
generally flower the second year. Offsets may be secured 
in quantity after the parent Ixias have ripened off, and 
they should be stored in a dry place, until starting time, 
the following autumn, 
Cultivation in Pots. Ixias, cultivated as pot plants, 
are very attractive, and admirably adapted for conserva- 
The bulbs should be potted rathér firmly, in sandy loam 
and leaf soil, during October, placing about six or eight 
in a 5in. pot, and covering them with lin. of soil. The 
pots may then be plunged or stood on ashes in a cool 
frame, and but little water will be required throughout 
the winter. When the flower-spikes appear, more water 
may be given, and the plants fully exposed to light and 
plenty of air: draughts, however, must be avoided. After 
flowering, growth and a gradual ripening should be en- 
couraged, by keeping the plants watered for a time. 
When the leaves die away, the bulbs may be shaken 
out and stored in bags until’ the autumn, or they may 
be allowed to remain in the soil and be kept dry. 
Where the cultivation of Ixias is attempted outside, a 
well-drained, sunny, south border should be selected, and 
the bulbs planted ‘about 6in. deep, in autumn. They 
should be lifted annually after being ripened, unless the 
locality is favourable enough to ensure their safety when 
left outside. Ixias do not require much heat, and, more- 
over, do not succeed well in a high temperature, 
— apa ia 
É rose-coloured, numerous ; 
equal to the tw pril. h. 2ft, 1774. SYN. Me 
(B. M. 1013, —— name of I. . capillaris aulica.) 
I. candida (white). A synonym of I. leucantha 
I. capillaris (capi xe flesh-colour or lilac ; 
————— ving five — Bapakkk, alain teas —— as 
— E lft 1774. SYN. —— 
many — A 
— formed). fl. seine ; filaments united at 
(B. M. 61 
columellaris 
* August. A. 6in. 1790. (B.M 
fl. pink ; tube slender, a 
nding-stalked). little 
habe bas ———— aktni. April and May. — 
jor song 
enlarged 
h. 2ft. — 
ne and July. — hele 
ike one or two-flowered. 
1 9. (B. M. 1379.) : 
hybrida (hybrid).* fl. white; raceme flexuose, many-flowered. 
— and el yet: tg he ift. 1757. — AE 121, undor name 
of I. flexuosa.) ; ; SRR A 
I. leucantha —— 
toothed, shorter than the 
1779. SYNS. I. candida, ee — * 
ie Stl ae ik ie 
of ae 
April and May. | itt, : un name 
— — y -white). Al. cream-coloured, in spiked 
heads; tu 
ts. May and June. J. linear- 
—— 1780. ee iat E o0. under mhs a 
ta.) 
. blue ; — united in a 
(B. M. 607.) 
—* than the ators, — 
— — 
ns g-flowered).* jt. 
— 
(B. M. bbe) 
; limb 
Lye (man . vari a 
Ta no tow on ANE May and me 
Rik 1757. (A. TD. R. 155.) Thore — 
rical, cam- 
(showy).* — yew limb acs, oee —_ 
z ipaa ie GS 
