AN ENCYCLOPADIA 
77 
OF HORTICULTURE. 
TRENTEPOHLIA. Included under Cyperus. 
TREVESIA (called after the family Treves de Bon- 
figli at Padua, who were supporters of botanical research). 
Orv. Araliacew. A genus embracing eight or nine species 
of prickly or unarmed, stove shrubs or small trees, in- 
habiting tropical Asia, Malaya, and the Pacific Islands. 
Flowers polygamous, in panicled umbels; petals eight to 
twelve, often cohering as a cap in the fertile flowers; 
stamens as many as the petals; pedicels not jointed; 
bracts small or wanting. Leaves ample, palmatifid, or 
digitately or pinnately compound. T. eminens and T. pal- 
mata require a mixture of sand, loam, and leaf mould. 
Cuttings will readily root in sand, under a glass, in heat. 
T. eminens (eminent). l. long-stalked, roundish in outline, 
palmatifidly divided about two-thirds of their depth into nine 
lanceolate segments, which have each a prominent rib and both 
edges serrated, the teeth distinct, small, but sharp-pointed. 
Philippines, 1882. Probably a mere form of T. palmata. See 
Fig. 91 (for which we are indebted to Mr. Wm. Bull). 
T, palmata (palmate-leaved). fl. greenish-white ; panicles 1}ft. 
long, straggling, clothed, when young, with red-brown tomentum. 
March, Jl. very large, sometimes 2ft. long, palmate or digitate, 
nearly glabrous; segments lobed or sub-pinnatifid. Shoots 
covered with reddish hair and many prickles. +A. 10ft. to 15ft. 
India, 1818. Tree. Syns. T. sundaica, Gastoni lmata (B. R. 894). 
T. sundaica (Sunda Isles). A synonym of 7. palmate. 
TREVIRANA. A synonym of Achimenes (which 
see). 
TREVOA (named in honour of Trevo, a Spanish 
botanist). ORD. Rhamnee. A small genus (two or three 
species) of much-branched, greenhouse trees, natives of 
South America. Flowers fascicled below axillary spines ; 
calyx four or five-lobed; petals four or five, hooded; 
stamens four or five, the filaments pilose; pedicels short, 
one-flowered. Leaves opposite, ovate or obovate, three- 
nerved, serrulated. T. trinervis has been introduced, 
but is now probably lost to cultivation. : 
TREWIA (named in honour of C. J. Trew, 1695-1769, 
of Nuremberg, a botanical author). Syn. Rottlera (of 
Willdenow). ORD. Euphorbiacew. A genus consisting of 
only two species of stove trees, often branched from the 
base, with soft wood, natives of the East Indies. Flowers 
dicecious, apetalous; disk none; male racemes lateral, 
opening before the leaves, long and loose, the flowers 
rather large, solitary, pedicellate, with a bract; female 
flowers solitary on an axillary peduncle or indefinitely 
racemose. Leaves opposite, petiolate, broad, entire, three 
to five-nerved. T. nudiflora, the only species introduced, — 
succeeds in a compost of sandy loam and peat; it may be 
readily increased by cuttings, inserted in sand, under a 
glass, in heat. 
T. nudiflora (naked-fiowered). ji., racemes axillary ; males often 
exceeding the leaves, bearing flowers along nearly the whole 
of their length; females few-flowered. May. l. broadly ovate, 
acute or acuminate, cordate, obtuse or contracted-sub-cuneate 
at base, five-nerved, entire. Branchlets glabrous, or the young 
ones pubescent. A. 5ft. and upwards. East Indies, 1796, 
(B. F. S. 281. 
TRI. This term, used in compounds, signifies three : 
e.g., Tricuspidate, three-cusped. 
TRIACHYRUM. A synonym of Sporobolus 
(which see). 
TRIADELPHOUS. When the stamens of a flower 
are disposed in three bundles. 
TRIADICA. A synonym of Sapium (which see). 
TRIANDROUS. Having three stamens. 
TRIANEA (named in honour of M. José Triana, a 
botanist and traveller in Columbia). Sys. Hydromystria, 
Jalambicea. ORD. Hydrocharidee, A’ genus comprising 
three or four species of stove or greenhouse, stolor ‘forous, 
aquatic herbs, natives of North America, Mexi and 
tropical South America, now regarded, by Benth: ar 
Y 
| Trianea—continued. 
Hooker, as synonymous with Limnobium, Spathes uni- 
sexual, two-leaved in both sexes; male flowers two or 
three in a spathe, long-pedunculate; females solitary in 
a spathe, sessile or shortly petiolate. Leaves fascicled 
at the nodes, petiolate, the blades swimming on the top 
of the water, ovate or rounded-cordate, sometimes (not 
always) of a thick, spongy substance below. Stems 
stoloniferous. T. bogotensis, the only species yet intro- 
duced, thrives in stove or greenhouse heat. Propagation 
is readily effected by runners. Ms 
T. bogotensis (Bogota). ñ. small, six- ; bracts hyaline, 
embracing the peduncles. l. clustered, oblong or orbicular, flat- 
convex, below spongy-reticulated; petioles dilated at base. 
Columbia, 1879. The correct name of this plant is Limnobium 
bogotense. (G. C. n. S., XV., pp. 466-468 ; R. G. 980.) 
TRIANTHEMA (from treis, three, and anthos, a 
flower; alluding to a frequent disposition of the blossoms). 
Orb. Ficoideæ. A genus embracing about a dozen species 
of stove or greenhouse, diffuse, prostrate herbs, rarely 
sub-shrubs, inhabiting the warm regions of Asia, Africa, 
and Australia, and the West Indies. Flowers axillary, 
solitary, cymose or fascicled, sessile or pedunculate, 
rarely sub-spicate on the terminal branches; calyx lobes 
five; petals absent; stamens five or indefinite. Leaves 
opposite, unequal, petiolate, obovate, ovate, or linear, 
entire. Three species have been introduced, but they 
are interesting only to the botanist. 
TRIAS (from treis, three; alluding to the arrange- 
| ment of the floral envelopes). ORD. Orchidee. This 
| small genus embraces only three species of dwarf, tufted 
or creeping, stove Orchids; two are natives of Moulmein, 
and the other inhabits the East Indian peninsula. 
Sepals sub-equal, spreading, the lateral ones adnate at 
base with the foot of the column; petals small, oblong 
or linear; lip slightly spreading at apex, narrow, rather 
thick; scapes lateral, slender, leafless, one - flowered. 
Pseudo-bulbs rather small, sub-globose, one-leaved at 
apex. T. oblonga, probably the only species in cultiva- 
tion, thrives best in an intermediate house, in small pans 
of peat and sphagnum, or on blocks with a little peat and 
sphagnum fastened amongst the roots. P 
pee 
. small, 
T. oblonga (oblong-leaved). fl. fuscous-green, with a 
lip ; scapes erect, much shorter than the leaves. April. 
ve Say acute, coriaceous. h. 3in. Moulmein, 1837. 
à 
Fic. 92. FLOWERING BRANCH OF TRIBULUS TERRESTRIS. 
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