HENDERSON'S HANDBOOK OF PLANTS. 



231 



TOU 



entirely distinct species, having deep yellow 

 and maroon-colored flowers. All make excellent 

 basket or vase plants. They must be kept at a 

 temperature in winter of not less than 60 at 

 night, and they are at all times impatient of being 

 chilled. Propagated by seeds or cuttings. 



Touch-me-not, Balsam, Jewel Weed, is Impa- 

 tii us i a ,/i-i/i- -tii nijere, a marshy plant, common 

 from New York southward. See Imputiens. 



Torreya. Named in honor of Dr. John Torrey, 

 one of the most distinguished of American bot- 

 anists. Linn. Dioecia-Monadelphia. Nat. Ord. 

 TaxacecK. 



This genus is a branch of the Yew family, 

 and is represented in this country by T. taxifu- 

 li.a, a native of Florida, a perfectly hardy and 

 beautiful species, and one of the most attractive 

 and desirable evergreens. T. Calif ornica is known 

 as the California Nutmeg. 



Tournefprtia. In memory of Joseph Pitton de 

 Tournefort, the distinguished author of an 

 arrangement of plants under the title of "Insti- 

 tutiones Rei Herbaria]," and other botanical works, 

 from 1694 to 1717; his first work, the "Institu- 

 tiones,'' laid the foundation of the arrangement 

 now followed, called the Jussieuan or Natural 

 i-iystem. Linn. Pentandria-Monogynia. Nat. Ord. 

 EhretiacetK. 



A genus of evergreen twining shrubs inhabit- 

 ing the tropics of both hemispheres, and ex- 

 tending as far north as the Canaries and Central 

 Russia. T. heliotropioides, from Buenos Ayres, 

 is a very beautiful species, and is occasionally 



frown in the green-house for its pale lilac 

 owers, which are arranged similar to those of 

 the Heliotrope. Propagated by cuttings. 



Tower Mustard. See Arabis perfoliata. 



Toxicodendron. See Rhus toxicodendron. 



Trachelium. Throatwort. From Irachelos, the 

 neck; in allusion to the efficacy of the plant in j 

 diseases of the throat; hence the common name, i 

 Throatwort. Linn. Pentandria-Monogynia. Nat. I 

 Ord. Carnpanulacece. 



Very pretty half-hardy biennial plants, with ! 

 showy bell-shaped blue flowers, varying from 

 very dark blue to nearly white. They are na- 

 tives of the Mediterranean coast. Seeds should ! 

 be sown in spring for flowering the next season, 

 and the plants protected by a frame in winter. 



Tradescantia. Spiderwort. Named after John j 

 Tradescant, gardener to Charles I. Linn. Hex- 

 andna-Monogynia. Nat. Ord. CommdynacecK. 



An extensive genus of green-house and hardy 

 herbaceous perennials. Of the tender sorts, 

 T. zebrina, a native of South America, and its ; 

 varieties, are grown largely for basket plants, i 

 and also as a house plant, thriving well in a ' 

 shady, moist place. T. Buchanani resembles 

 the preceding, but is a stronger grower T. I "/;- 

 ginica, and its varieties, are hardy herbaceous 

 plants, interesting for the border, on account of 

 the continual succession of their blue or white 

 flowers, which are produced every morning from 

 May to September. They have long, grass-like 

 foliage, and the flowers are borne on stems from 

 one to two feet high in terminal clusters. T. ' 

 repent* vittutd, 'J'. m/i/a/ica, and their varieties, ; 

 are among the best known of our house plants, i 

 where they are known as "Wandering Jew." 

 They grow freely in water, making n drooping 

 fringe of from two to four feet, and are used in a 

 variety of forms in the window culture of plants. 

 The green-house species are propagated readily 

 by cuttings, and the hardy species by division 

 in early spring. First introduced in 1629. 



TRI 



Tragopogon. Goat's Beard, Vegetable Oyster. 

 From tragos, a goat, and pogon, a beard ; in al- 

 lusion to the long, silky beards of the seeds. 

 Linn. Syngenesia-^Equalis. Nat. Ord. Asteracece. 

 Ornamental biennial plants, natives of Eu- 

 rope, which only require to receive the usual 

 treatment of similar plants. Of the British spe- 

 cies, the most remarkable are T. pratensis, the 

 popular name of which is Go-to-bed-at-noon, 

 from the flowers closing in the middle of the 

 day, and which has large yellow flowers, and a 

 very curious feathery head of seeds; and T. pvr- 

 rifolius, the common Salsify, or Oyster Plant, 

 which has purple flowers, and the roots of 

 which are extensively grown, and highly valued 

 as a vegetable. It is a hardy biennial, native of 

 Great Britain and most other parts of Europe. 

 The seeds should be sown early in deep, rich 

 soil. Culture the same as for Carrots or Parsnips. 

 Trailing Arbutus. See Epigcea repens. 

 Trapa. Water Caltraps, Water Chestnut. From 

 calcilrapa, an ancient instrument in warfare 

 with four spikes; fruit of some species armed 

 with four spikes or horns. Linn. Tetrandria- 

 Monogynia. Nat. Ord. Haloragacece. 



A genus of aquatic plants, natives of Europe, 

 India, China, and Japan. They are remark- 

 able for the shape of their seeds, some of which 

 resemble a bullock's head and horns. The 

 seeds of all these plants abound in starch, and 

 are much used as food. Those of T. natans, 

 called Jesuit's Nuts at Venice, are ground into 

 flour and made into bread in some parts of 

 Southern Europe. In Kashmir, a large portion 

 of the inhabitants subsist on these nuts for 

 several months in the year. 

 Traveler's Joy. See Clematis vitaJba. 

 Traveler's Tree. See Urania. 

 Treacle Mustard. See Erysimum. 

 Tread-Softly. Spurge Nettle. See Jatropha 



wens. 



Tree of Heaven. See Ailantus. 

 Trefoil. See Trifolium. 



Tremandra. From tremo, to tremble, and andros, 

 a male; the anthers vibrate with the least move- 

 ment of the air. Linn. Decandria-Monogynia. 

 Nat. Ord. Tremandracecp. 



This genus consists of but two known species, 

 both small green-house shrubs, natives of New 

 Holland. They are delicate shrubs, covered 

 with stellate down, and have axillary purple 

 flowers. They are but rarely cultivated, except 

 T. verticillata, which is a very beautiful plant, 

 and has long been a favorite in choice collec- 

 tions. Propagated by cuttings. Introduced in 

 1845. See Tetratheca. 



Trichinium. From trichinos, hairy ; flowers cov- 

 ered with knotted hairs. Linn. Pentandria- 

 Monogynia. Nat. Ord. Amarantacece. 



A genus of annuals and herbaceous perenni- 

 als from Australia. The flowers of some of the 

 species are extremely ornamental. Their yel- 

 low, crimson, white, or pink flowers, are pro- 

 duced in terminal heads or spikes. The peren- 

 nials require to be grown in the green-house. 

 The annuals should be started in seed boxes in 

 February, as our seasons are too short for their 

 development if the seed is sown in the border. 

 Trichocentron. From thrur, a hair, and centron, 

 a spur or center; reference not clear. Linn. 

 Gynandria-Mnnandria. Nat. Ord. Orchidacew. 



A considerable genus of epiphytal Orchids 

 from South and Central America. Most of the 

 species are not considered worth growing. T. 

 atropurpureum, from the Rio Negro, is an ex- 



