Trigonia 



( 406 ) 



Tristagma 



TRIGONIA. 



Evergreen climbing shrubs (ord. Voohysiacese). 

 They require a stove temperature, are increased by 

 cuttings, and grow in a mixture of equal parts of 

 fibrous peat and loam, with sand. 



Principal Species : 

 Candida, 6', Je., wh. laevis, C' to 8', Je., wh. 



TRIGONIDIUM. 



Stove epiphytal Orchids (ord. Orohidacese). 

 Cultivate on blocks of wood, or in baskets of fibrous 

 peat, charcoal, and sphagnum, giving a light posi- 

 tion near the glass. 



Principal Species : 

 acuminatum, 1', sum., egertonianum, I'.sum.. br. 



straw, br. latil'olium, 1', sura., br. 



TRILISIA. 



Hardy, erect growing herbs (ord. Compositse), 

 increased by division in spring. Ordinary garden 

 soil. 



Only Species : 



ocloratissima, 4', Sep., paniculata, 3', Aug., pur. 

 pur., sweet. 



TRILLIUM. 



A small genus of hardy perennial herbs (ord. 

 Liliaceae), the majority of which are in cultivation, 

 and are interesting and often showy plants. The 

 genus is distinguished by its thick, rhizornatous 

 stems and roots, and three leaves, which have 

 a solitary nodding flower in the centre. The 

 roots of most of the species have emetic prop- 

 erties. Propagation, by seeds or division. Deep, 

 rich, peaty soil, quite moist but sweet, forms the 

 most suitable rooting medium. A rather shady 

 place, and abundance of moisture when growth is 

 Active, are essentials to success. 



Principal Species : 



cenmum, H', Ap., wh. roseum, ro. 



crectum, 1', Ap., pur. sessile, 6" to 12", ilch., 



(syns. atropurpureum pur. Californicuin is a 



and purpureura). good form, 



grandiflorum, 1' to I'/, 



My., wh. 



Other Species : 

 erythrocarpum, C", My., petiolatum, 6", Ap., br. 



red, wh. recurvatum, 6" to 1^", 



nivale, 1', sum., wh. Ap., brownish pur. 



ovatum, 6", Ap., red. stylosum, 6", Ap., red. 



TRIMEZA. 



Small bulbous plants (ord. Iridese), with Iris-like, 

 or sometimes Rush-like, leaves, and showy, fugitive 

 flowers. Increased by seeds or division of the 

 bulbs at the time of potting. Soil, light, fibrous 

 loam, with sand. A stove or intermediate house is 

 required. 



Principal Species : 



martinicensis, 1', Ap., yel. 



TRINIA. 



Hardy perennial herbs (ord. UmbelliferEe) of 

 branching habit, with one species, vulgaris, British. 

 The flowers are yellow or white and the leaves 

 pinnately cut. The plants are of no value for 

 decorative gardening. 



TRIODIA (syn. UBALEPIS). 



Greenhouse or hardy perennial Grasses (oft/. 

 Gramineie). Decumbens, the Heath Plant, is 

 British, but neither it nor the other species is 

 worth cultivation. Several species have been 

 brought to this country. 



TRIOLENA. 



Stove herbs (ord. Melastomaceae), of dwarf, 

 rather dense, habit, bearing small rose or pink 

 flowers. Propagation, by cuttings or seeds. Soil, 

 two parts of peat, one part of leaf mould, and one 

 part each of sand and loam. 



Principal Species : 



scorpioides, G", sum., ro. 



TRIOPTERIS (syn. TRIOPTERYS). 



Stove climbing shrubs (ord. Malpighiace.'c), of 

 little value, and rarely included in collections. 

 Propagation, by cuttings of ripe shoots, in sand, in 

 a close frame, with bottom heat. Soil, sandy peat. 



Principal Species : 



rigida, My., bl., Ivs. very rigid, leathery, and 

 nearly round. 



TRIOSTEUM. 



Hardy herbs (ord. Caprifoliaceas). Propagation, 

 by division in spring or autumn, or by cuttings in 

 summer. Soil, warm, light loam. 



Principal Species : 



perfoliatum, 2', Je., red. 



TRIPHASIA. 



Aurantiola (synii. diacantha, javanica, and tri- 

 foliata) is the only known species of this genus 

 (ord. Kutacea?). It grows 2' high, and bears 

 small, evergreen leaves and white flowers in June 

 and July, followed by small, berry-like, edible 

 fruit. It is increased by cuttings in heat. (For 

 cultivation, see CITBUS). 



TRIPTERYGIUM. 



Wilfordii (syn. Bullockii), a hardy, prostrate 

 shrub (ord. Celastrinese) is the only known species 

 in this genus. It sometimes attains a height of 2' 

 or 3', and in summer it bears small white flowers. 

 Increased by cuttings, grows in ordinary garden 

 soil. 



TRIPTILION. 



Hardy or half-hardy herbs (ord. Composite:), 

 bearing alternate, sharply toothed leaves and heads 

 of blue or white flowers. Propagation, the annuals 

 from seeds, the perennials by division. Ordinary 

 garden soil. 



Principal Species : 

 Acm'Heip, 9" v Jy., cordifolium, 6" Jy., aim., 



wn. wh. 



spmosum. 6", Jy.,per., bl. 



TRISETUM. 



Rostraria and Trichsete are included in this 

 genus of hardy annual or perennial Grasses (ord. 

 Graminefe). Pratense (st/ns. flavescens and Avena 

 flavescens), the only British species, is of more 

 importance to the farmer than to the gardener, 

 seeing that it is usually to be found among the 

 Grasses that go to make np the best pastures. 



TRISTAGMA. 



Bulbous plants (ord. Liliaceas), with radical, Grass- 

 like leaves and umbels of white or yellowish 

 flowers. They must be cultivated in rich, loamy 

 soil in a sunny greenhouse. 



Principal Species : 



narcissoides, G", spr., whitish yel. 



Tripliysaria (sec Orthorarpiit}. 

 Triplet Lily (tee JSrodiiea). 

 Tripoli/ (Aster Tripoli it in}. 



