Naturalisation in Extra- Tropical Countries. 479 



Thelig-onum Cynocrambe, Linne. 



Countries around the Mediterranean Sea, extending to the Canary- 

 Islands. An annual spinach-plant of somewhat aperient effect. 



Thouarea sarmentosa, Persoon. 



Tropical shores of the eastern hemisphere. This curious and 

 tender grass might be easily introduced, to help in binding the sand 

 on sea-beaches. It likes wet ground. 



Thrinax parviflora, Swartz. 



South-Florida, West-Indies, also on the continent of Central 

 America. The stem of this Pan-Palm attains a height, according 

 to Dr. Chapman, of about 40 feet, but is extremely slender. Belongs 

 to the sand-tracts of the coast ; hardy in the South of France to 

 43 32 ' N. lat. [Naudin] . The fibre of this palm forms material 

 for ropes. T. argentea (Loddiges) is an allied palm. The few 

 other species of the genus from the West-Indies also deserve trial- 

 culture. 



Thuya dolabri-ta, Linne fll. (Thuyopsis dolabrata, Siebold and Zuc- 

 carini.) 



The " Akeki " of Japan, ascending to an elevation of 8,000 feet. 

 A majestic tree of conical shape and drooping habit, growing to 

 100 feet high, attaining a stem-diameter of 3 feet. It delights in 

 sheltered and rather moist situations, and is used in China and 

 Japan for avenues. Hardy in Norway to lat. 58 27 ' [Schuebeler]. 

 It furnishes an excellent hard durable timber of a reddish colour, 

 employed particularly for water-works, ship-, bridge- and house- 

 building ; the bast-fibre is strong and durable, thus made into ropes 

 [Prof. Luerssen]. 



Thuya g-ig-antea, Nuttall. 



North-Western America. The Yellow Cypress of the colonists, 

 also known as Oregon Red or White Cedar. A straight tree, in 

 some instances known to have attained a height of 325 feet, with a 

 stem 22 feet in diameter ; it furnishes a valuable building timber 

 of a pale or light-yellow colour, susceptible of high polish. It is 

 light, soft, smooth and durable, and makes the finest sashes, doors, 

 mouldings and similar articles [Yasey] ; also used for shingles 

 [Dawson]. Canoes carrying 4 tons have been obtained out of one 

 stem. The bast can be converted into ropes and mats. The tree 

 may be trained into hedges and bowers. It endures the climate of 

 Christiania. To Thuya are referred by Bentham and J. Hooker all 

 the cypresses of the sections Chamsecyparis and Retinospora. 



