SELECT LISTS OF PLANTS. 301 



planted in frames, where they can be given slight protection during the 

 winter, 



Tecoma (Trumpet Creeper). For propagation see Lignonia. 



Tliea (Tea Plant). See Camellia. 



Thuja (Arbor- Vitse, White Cedar). A very extensive genus of con- 

 iferous evergreen trees, or a very limited one, depending entirely upon 

 whose classification we adopt as our guide. If the Retinisporas, Chamce- 

 cyparis, Libocedrus, and Blotos are excluded, as they are by some bota- 

 nists, a very limited number of true Thujas remain or only two, and 

 these are both indigenous to the United States. But if all the species 

 of the above so-called genera are included, then the genus will be a 

 moderately large one. But the different species are so closely allied that 

 one mode of propagation answers equally well for all. They are readily 

 propagated by seeds, sown in spring in half shade, and watered as often 

 as necessary to. keep the surface of the bed moist ; by layers, cuttings of 

 the green shoots under glass, and of the ripe twigs in autumn, planted 

 in frames out-of-doors, or in a cool greenhouse. Grafting under glass is 

 extensively practiced in increasing the plants of rare species and varie- 

 ties. (For Stocks, see Chapter XVIII.) 



Ttlia (Linden, Basswood). A small genus of only about a half dozen 

 species of large, deciduous trees of the temperate regions of Europe and 

 America. All valuable for ornament and for their timber. Propagated 

 by seeds, layers, budding and grafting. The seeds should be sown as soon 

 as ripe, or packed away in moist sand until spring, and then sown. Some- 

 times the plants will not appear until the second season. Layers strike 

 root quite readily, if notched or merely twisted until the bark is slightly- 

 broken. Budding and grafting in the open ground is the usual mode of 

 increasing rare varieties. (See Chapter XVIII,, on Selecting Stocks.) 



Torreya (Stinking Cedar). Evergreen trees of the Yew Family. 

 One species, native of Florida (T. taxifclid), is called " Stinking Cedar" ; : 

 another, on the Pacific Coast ( T. Calif arnica}, is known under the com- 

 mon name of "California Nutmeg." There are in addition several 

 oriental species. Propagated by the same modes as the common Yew. j 



Ulmus (Elm). A genus of noble, ornamental and useful, deciduous 

 forest trees, mostly natives of Europe and America. There are but few 

 species, but a large number of natural varieties, as the elms are noted for 

 their wide variation from what may be considered the normal types. 

 Long cultivation and the raising of immense numbers from seeds under 1 

 artificial conditions, has still further augmented the number of distinct 

 varieties. Seeds of most of the species ripen early in summer, and should 

 be sown as soon as they fall from the tree, and lightly covered with soil. 

 Some will germinate in a few days, while others remain dormant until 

 the following spring. Varieties are readily propagated by layers and by 

 grafting on strong stocks of closely allied species in the open an*. (See 

 Stocks, Chapter XVIII.) 



