a 
488 TRICHOCHLOA. 
ing of these is a small and easily cultivated one 
called 7. iridzfolium. 
TRICHOCHLOA. A genus of exotic grasses, 
of the agrostis tribe. The name signifies ‘hair- 
grass, and is descriptive. Five perennial species, 
and an annual one, all hardy, and mostly about 
a foot high and blooming in June and July, have 
been introduced to British collections from vari- 
ous parts of North America; and upwards of 20 
more are known. All the introduced species are 
interesting to naturalists; and four are assigned 
by some botanists to the genus agrostis; but none 
possess any agricultural value. 
TRICHODESMA. A genus of exotic annual 
plants, of the borage family. The Indian spe- 
cies, 7. indicum, called by Linneus Borago in- 
dica, is a handsome blue-flowered annual, of 
about a foot in height, blooming from midsum- 
mer till late in autumn, and capable of cultiva- 
tion in the open ground; and it was introduced 
to Britain from India in 1759. 
TRICHODIUM. See Agrostis. 
TRICHOLAINA. A handsome, exotic, peren- 
nial grass, of the sugar-cane tribe. It constitutes 
a genus of itself, and bears the specific name of 
micrantha or ‘small-flowered ;’ but was regarded 
by Linneus as a true sugar-cane, and by Spren- 
gel as a panic-grass. It is a native of Teneriffe, 
and was introduced to Britain in 1825. It hasa 
height of about a foot, and blooms in June and 
July; and it forms an interesting object in the | 
greenhouse, but does not possess any economical 
importance. 
TRICHOMANES. 
ferns, of the polypody tribe. 
A genus of ornamental 
Hymenophyllum alatum, is a very handsome ever- 
green indigen of the moist rocks of Britain, about 
4 inches high, and blooming in May and June. 
Nearly 50 exotic species are known. The name 
trichomanes is given also to a beautiful indige- 
nous species of the spleenwort genus. See the 
article Marpun-Harr. 
TRICHONEMA. A genus of ornamental, 
bulbous-rooted plants, of the iris order. The 
bulbocodium species, 7’. bulbocodium, is a native 
of the Channel Islands and of the South of Eu- 
rope; and was introduced to Britain in 1739; 
and is so hardy as to be freely cultivable in the 
open ground. Its bulb is ovate and esculent, 
and has two membranous coats; its leaves are 
spreading and 3 or 4 inches long; its flower- 
stalks are either simple or branched, and com- 
monly about 6 inches high; and its flowers have 
a reddish or purplish colour, and bloom in March 
and April. About twenty species have been in- 
troduced, principally from the Cape of Good Hope 
_and the South of Hurope; and have variously 
blue, purple, red, pink, rose-coloured, yellow, and 
greenish-white flowers; and have for the most 
part a height of about 6 inches; and love a mixed 
soil of sand and peat and loam; and must be 
grown either in the greenhouse or in a pit or 
The short-bristled ' 
species, 7’. brevisetum, called by some botanists | 
TRILLIUM. 
frame; and are propagated from offsets. All are 
beautiful; and several are nearly allied to the 
ixias. 
TRICHOSANTHES. See Snake Gourp. 
TRICHOSTEMA. A small genus of hardy, 
ornamental, blue-flowered, North-American, an- 
nual plants, of the labiate order. The dichoto- 
mous and the linear-leaved species were intro- 
duced to Britain about 90 years ago, and have a 
height of about a foot, and naturally bloom in 
June and July. 
TRICORYNE. A genus of ornamental, Aus- 
tralian, herbaceous plants, of the asphodel tribe. 
Two evergreen perennials and one biennial, 
varying in height from 10 to 25 inches, have been 
introduced to the gardens of Britain; and they 
love a soil of rich mould, and are propagated by 
radical division. 
TRICUSPIS. A small genus of exotic grasses 
of the glyceria tribe. The five -cleft species, 
Tricuspis quinquefida, called by Michaux Poa 
cerulescens, is a native of North America, and 
was introduced about 30 years ago to Britain. 
It is a perennial, and has commonly a height of 
about 2 feet, and blooms in June and July; it 
thrives best in a soil of rich mould; and it pos- 
sesses some claims to rank as an agricultural 
plant. 
TRIDENTEA. A genus of Cape-of-Good-Hope, 
curious, small, evergreen undershrubs, of the 
swallow-wort family. The name alludes to the 
fancied resemblance of the flowers to a trident. 
Seven species, all about 6 or 7 inches high, and 
mostly carrying dark purple or brown purple 
flowers, but blooming at very different periods, 
have been introduced to Britain; and they love 
a soil of sandy loam, and require the heat of the 
dry stove, and are propagated from cuttings. 
TRIENTALIS. See Winter Green. 
TRIFOLIUM. See Treroiz and Crover. 
TRIGLOCHIN. See Arrow-Grass. 
TRIGONELLA. See Frnucrenx. 
TRIGONIA. A small genus of ornamental, 
tropical, evergreen shrubs, of the hippocratea 
tribe. The name alludes to the three-cornered- 
ness of the fruit. Two species, the villous and 
the soft, have been introduced to British col- 
lections from Cayenne and Brazil. 
TRIGONIDIUM. A genus of beautiful, tropi- 
cal, epiphytous plants, of the orchis family. The 
blunt-petaled species, 7’. obtusuwm, was introduced 
to Britain in 1834 from Demerara, and is about 
a foot high, and carries white and red flowers in 
autumn ; and Egerton’s species, 7’. Hyertontanum, 
was introduced in 1837 from Honduras,.and is 
about 20 inches high, and carries yellow and 
brown flowers throughout a great part of the 
year. 
TRILLIUM. A genus of ornamental, hardy, 
perennial, tuberous-rooted, herbaceous plants, of 
the melanthium family. Fifteen species have 
been introduced to Britain from Canada and the 
United States of America. Most@row wild in | 
