TORTULA. 



316 



TRAGOPOGON. 



Toad-flax. — See Lina'ria. 

 '' Tobacco. — See Nicotia'na. 

 ' To'lpis. — See Hawkweed. 

 i ToxQUiN Bean.— i)?p^eriaj odo- 

 \ rata Schreb. {Baryosma Tongo 

 Gsert.) — A leguminous plant, of uo 

 beauty in its flowers, which are pur- 

 I pie, but cultivated for its bean-like 

 ; seeds, which are remarkably fra- 

 ' grant. It is a native of Guiana, 

 ' where it is a tall tree ; and it re- 

 I quires a stove in England, where it 

 I may be gro-mi in a compost of peat 

 i and loam. 

 j TooTHACHE-TREE. — See Xan- 



! THO'XYLUH. 



I Topiary. — The art of cutting 

 ' yews and other trees into curious 

 shapes, by putting a wire frame- 

 work over them, and then clipping 

 • the trees into the desired form. This 

 ! art was practised to such an extent 

 ! in ancient Rome, that the word for 

 i topiarist was used as synonymous 

 , with that for gardener. 

 ! ToRE^NiA. — ScrophularincB. — 

 I Australian plants with pretty 

 \ flowers, which require to be kept 

 in a greenhouse, and grown in 

 sandy loam. One species is a half- 

 hardy annual, which may be raised 

 on a hotbed, and planted out in 

 ; May. 



j Tormenti'lla. RosacecB. 



I British plants, with yellow flowers, 

 \ which, though weeds, look very 

 ! well on rock -work. The double- 

 1 flowered variety of T, erecta is very 

 I ornamental. 



i Torre' ya. — Conifer cb. — A very 

 ' handsome evergreen tree, a native 

 ; of Florida, in North America, nearly 

 i allied to the yew, and forming a link 

 ■ between that tree and the Hemlock 

 I spruce. 



To'rtula. — Cryptogdmia Musci. 

 ) — Wall-moss. — A kind of moss, 

 ; very useful in making moss-houses, 

 I from the brightness and vai'iety of 

 j its colours ; some of the species 



being of a dark blue green, others 

 of a rich yellowish green, others of 

 a very pale pea-green, and one of a 

 dark rich brown. They are ail 

 common in Britain. 



Touch-me-not. — See Impa'tiens. 



Tournefo'rtia. — BoraglnecE. 

 Hothouse and greenhouse shrubs, 

 and hardy and half-hardy perennials, 

 ' natives of South America. T. Mes- 

 I serschmldia is a greenhouse shrub, 

 j with very fragrant flowers, which 

 I have no beauty ; and T. heliotro- 

 IpWides is a half-hardy perennial, 

 strongly resembling the Heliotrope 

 in its flowers, but without any fra- 

 grance. They are all free-growing 

 plants in sandy loam, and they are 

 propagated by cuttings. 



Trache'lium. — Campanuldcece. 

 — Throatwort. — The most common 

 species, T. ccerideum, is a half- 

 hardy biennial, which requires to be 

 raised on a hotbed, kept in a frame 

 during w^inter, and planted out iu 

 spring, where it is to flower, in i-ich 

 mould. 



Trachyme'ne. — Umielliferce. — 

 Australian shrubs, requiring a green- 

 house. For the beautiful annual 

 species, T. ccerulea, see DiDi'scus. 



Tradesca'ntia. — CommeVmece, 

 — Spider wort. — Handsome herba- 

 ceous plants, the common kinds of 

 which only require planting in the 

 open ground, and in any common 

 garden soil. There are, however, 

 several hothouse plants belonging to 

 the genus, and two or three Mexican 

 or South American annuals, which 

 all require a light soil, enriched with 

 rotten dung, or vegetable mould. 



Tragopo'gon. — CompositcB. — 

 Goat's Beard. — Ornamental biennial 

 plants, natives of Europe, which 

 only require to receive the common 

 treatment of similar plants, and to 

 be grown in any garden soil. Of 

 the British species, the most re- 

 markable are T. piratensis, the 



