TRIPOLY. 
lections of Britain in 1824. The name triplaris. 
alludes to the triplicate arrangement of the parts 
of fructification. 
TRIPOLY,—botanically Aster Tripotium. An 
ornamental, blue-flowered, perennial-rooted, an- 
nual-stemmed, herbaceous indigen of the sea- 
shores of Britain. It has a height of about 2 
feet, and blooms in August and September. 
TRIPSACUM. A small genus of exotic grasses, 
of the maize tribe. Two hardy perennial species, 
the single-spiked and the dactylus-like, the for- 
mer about 2 feet high, the latter about 4 feet 
high, and both blooming in August, have been 
introduced to Britain from North America; but, 
though taking their name of tripsacum from the 
grinding of their grain into flour, they possess 
very little interest. 
TRIPTILION. A genus of ornamental, exo- 
tic, herbaceous plants, of the labiate order. Two 
very handsome species, the spiny and the cor- 
date-leaved, the former blue-flowered, the latter 
white-flowered, and both blooming from May till 
August, and capable of being treated in the 
manner of common hardy annuals, were intro- 
duced to Britain about 25 years ago from Chili. 
The spiny is very abundant in its native coun- 
try, and bears there the name of Sempreviva on 
account of the permanence of its deep azure 
flowers; and it produces these in corymbs, and 
may be so managed as to bloom throughout a 
great part of the year. Its root is fleshy, and 
_ somewhat like that of a dahlia in miniature; and 
its radical leaves spring up in autumn as soon as 
the flowering stems are cut off. 
TRISETUM. A genus of grasses of the oat 
tribe. Three species grow wild in Britain, nearly 
twenty have been introduced from other coun- 
tries, and a good many more are known. All 
the indigenous species were formerly ranked as 
true oats, and are described in the article Avuna. 
All the introduced species are hardy, and the 
majority are annuals, varying in height from 1 
foot to 6 feet; but none possess any noticeable 
economical interest. 
TRISTANIA. A genus of ornamental, Austra- 
lian, evergreen, ligneous plants, of the myrtle 
family. The name signifies ‘to stand by threes,’ 
and alludes to the disposition of the leaves and 
flowers. Seven or eight shrubby species, vary- 
ing in height from 6 to 12 feet, and two dendri- 
tic species of respectively about 50 and 80 feet 
in ordinary natural height, have been introduced 
to the greenhouses and conservatories of Britain; 
and all love a somewhat peaty soil, and are pro- 
pagable from cuttings. The two trees have 
white flowers, and bloom in June and July, and 
require a loamier soil than the shrubs; and the 
taller one, Zristania albicans, popularly bears 
among the colonists the name of the turpentine- 
tree. 
TRISTEGIS. A small, curious, hardy, peren- 
nial grass of the subbiflorous suborder. It takes 
its name from the circumstance of having three 
TROCHOCARPA. 
glumes; it constitutes a genus of itself, with the 
specific name of glutinosa or ‘clammy,’ and it 
differs widely in character from all the other 
subbifiorous genera. It has a height of only 6 
or 7 inches, and blooms in June and July. 
TRITICUM. See Wurar. 
TRITOMA. A genus of ornamental, ever- 
green, Cape-of-Good-Hope, herbaceous plants, of 
the day-lily family. our species, varying in 
height from 12 to 25 inches, and mostly carry- 
ing orange-coloured flowers, and blooming at an 
advanced period in the year, have been intro- 
duced to British gardens; and they love a soil 
of peaty loam, and require frame-protection, and 
are propagated by division of the root. 
TRITONIA. A genus of ornamental, South- 
African, bulbous-rooted plants, of the iris family. 
About 25 species, varying in height from 4 or 5 
inches to 2 feet, have been introduced to the 
greenhouses of Britain. Some bloom in spring, 
some in summer, and some in autumn; most 
have yellow or fulvous or rufous or brown- 
ish or white or orange coloured flowers; and all 
love a mixed soil of sand and loam and peat, and 
are propagated from offsets. The name tritonia 
is formed from a word signifying ‘a weathercock,’ 
and alludes to the stamens. 
TRIUMFETTA. A genus of tropical, yellow- 
flowered plants, of the lime-tree tribe. Three 
annual species of 2 or 3 feet in height, and up- 
wards of a dozen evergreen ligneous species, | 
principally about 3 feet in height, have been in- 
troduced to British collections, chiefly from the 
two Indies; but they possess little interest. 
TRIXIS. A genus of ornamental, exotic plants, 
of the labiate-flowered division of the composite 
order. A handsome, annual, Chilian species is 
noticed in the article Levceria; a beautiful, 
small, evergreen, ligneous species, of about a foot 
in height, carrying white flowers in autumn, 
Trixis auriculata, was introduced to the hot- 
houses of Britain about 22 years ago from Bra- 
zil; and 6 or 7 other species are known. 
TROCHAR. A surgical instrument, used for 
piercing the rumen of cattle in order to let the 
gas escape in hoove. See the article Hoove. 
The trochar closely resembles the instrument 
used in human surgery in tapping for dropsy; it 
consists of a short strong stilett, terminating in 
three cutting edges which converge to a point, 
mounted on a handle which admits of being 
forcibly grasped, and having fitted to it a silver 
tube which reaches from the point to the handle; 
and when used, the whole is plunged into the 
flank, the stilett is then withdrawn, and the tube 
remains as long as the operator judges necessary, 
and may be secured in the place by means of 
tapes attached to rings at its base and tied round 
the body of the animal. It is an useful instru- 
ment on any farm of the mixed husbandry, or 
wherever hoove is of more than very rare oc- 
currence. 
TROCHOCARPA. A small genus of orna- 
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