IPOMOPSIS. 
tifully in the open air; and £. or 
Pharbitis Ledrii, which will only 
flower in astove. Both these kinds 
produce an astonishing number of 
flowers, though each flower lasts 
only one day, and sometimes, if 
too much exposed to the sun, only 
a few hours; and both grow with 
great rapidity and vigour. JI. Learii 
is, however, a shrub, and is propa- 
gated by cuttings, which strike 
rapidly by the aid of a little bottom- 
heat. J. ficifolia resembles these 
species, but it has darker flowers, 
which will expand in greenhouse- 
heat, and which live two or three 
_days. It is shrubby, and continues 
flowering tillautumn. J. Horsféllie 
s also a most splendid climber. It 
should be grown in a moist stove, in 
rich light loam, and allowed plenty 
of water while growing. It thrives 
best when grafted on I. insignis, 
and when grown on its own roots, 
it should be cut down every year to 
within a few inches of the ground. 
Another species, J. tyriénthina, has 
very rich dark flowers, which it 
produces in great abundance. 
Tromo'psts. — Polemoniacee. — 
Beautiful biennial Peruvian plants, 
with splendid searlet flowers, which 
Professor Don, and some other bo- 
tanists, class with the Gilias; and 
which were formerly called Cantua. 
‘They are free-growing plants; but 
as they are supposed to require 
protection during winter, they are 
generally grown in pots in England, 
and kept in a greenhouse. In 
America, however, it appears that 
these plants are found in a wild 
state in Georgia ; and that they are 
left in the open gr ound all the winter, 
without any protection, in the neigh- 
bourhood of Boston, where the plants 
attain a size, (seven feet high,) and 
the flowers a brilliancy of colour 
quite unknown in Europe. They 
should be grown in a light and 
somewhat rich soil; and care should 
be taken to prevent their roots from 
259 
ISATIS. 
becoming sodden with water, as 
| when this is the case, they are very 
/apt to damp off. 
Iris. — Jriddcea. — There are 
three distinct kinds of Iris, besides 
innumerable species, hybrids, and 
varieties. These are, the fibrous- 
rooted kinds, which grow best in a 
fine sandy loam, and which increase 
rapidly every year by suckers frem 
the roots; the tuberous-rooted kinds, 
which are very apt to be destroyed 
by snails, or to ret from too much 
wet ; and the bulbous-rooted kinds, 
which should be taken up and re- 
planted every second or third year, 
as the new bulbs, which are formed 
every season, are always directly 
under the old bulb; and thus in the 
course of a few years the bulbs 
descend so low as to be out of the 
‘reach of the air, and consequently 
incapable of vegetation. Thus it 
will be generally found that persons 
in the habit of growing Irises, are 
always complaining of losing their 
plants, while the real fault rests with 
themselves for not taking up their 
bulbs at the proper time. The 
bulbous and tuberous-reoted Inises 
succeed best in sandy peat, or in 
any light and dry soil. The splen- 
did Chalcedonian Iris is one of the 
tuberous-reoted kinds; and it not 
only requires a dry soil during win- 
ter, but to be allowed plenty of pure 
air during the whole period of its 
growth, or it will be very apt to 
damp off. 
Irish Ivy.—The Giant Ivy, I. 
canariénsis, which, though called 
Irish, is, in fact, a native of the 
Canary Islands. 
Irish YeEw.—The upright grow- 
ing Yew, which forms a flame- 
shaped tree like the upright cypress, 
or Lombardy poplar, instead of 
spreading like the common kinds. 
When young, it makes a very hand- 
some shrub, from the fine colour and 
luxuriance of its foliage. 
Isa‘vis.—Crucifere.— I. tincto- 
