338 SELECT PLANTS FOR INDUSTRIAL CULTURE 



Tuber rufum, Pico. 



Red Truffle, especially in vineyards. Much used for food, but 

 smaller than the Terfezia Truffles. 



Ulex Europseus, Linne. 



Middle and South Europe, Azores, Canary Islands. The 

 Whin, Gorse, or Furze. A bush important for covering 

 quickly drift-sands on coasts. Too apt to stray as a hedge 

 plant. 



Ullucus tuberOSUS, Lozano. (Melloca tuberosa, Lindley.) 



Andes of New Granada and Peru, up to an elevation of 9,000 

 feet. A perennial herb, the tubers of which are edible. 



Ulmus alata, Michaux. 



The Whahoo Elm of North America. Height of tree 30 

 feet. Wood fine-grained, heavier and stronger than that of 

 the White Elm, of a dull-red colour, used by wheelwrights, 

 but like that of U. Americana not equal to the European Elm. 



Ulmus Americana, Linns'. 



The White Elm of North America, also called Kock or Swamp 

 Elm. A tree of longevity, fond of moist river-banks. One 

 hundred feet high, trunk 60 feet, 5 feet in diameter. 

 Manning mentions that trees bave been known to attain a 

 circumference of 27 feet at 3 feet from the ground, and of 

 13 feet where the branches burst forth. It is highly prized 

 for street-planting in North America. Can be propagated 

 like the European Elm from suckers. Almost indifferent to 

 soil. The timber is light, used for wheelwrights' work, bears 

 driving of bolts well (Robb). It is durable if either kept 

 quite dry or permanently submerged in water. 



Ulmus campestris, Linne.* 



The ordinary Elm, indigenous to South Europe and temperate 

 Asia, as far east as Japan. Several marked varieties, such as 

 the Cork Elm and Wych Elm, exist. The Elm in attaining 

 an age of several centuries becomes finally of enormous size. 

 In Britain much attacked by Scolytus destructor. The wood 

 is tough, hard, fine-grained, and remarkably durable, if con- 

 stantly under water. Next to the Yew, it is the best of Eu- 

 ropean woods, where great elasticity is required, as for archery 

 bows. It is also used for keels, blocks, wheels, piles, pumps, 

 gun-carriages, gunwales, various tools, etc. Wych Elm is 

 preferred for bending purposes (Eassie). The bast is tough. 



