430 THE NURSERY-MANUAL 



Thea (Tea). Ternsircemiacece or Theacece. 



Propagation as for camellia, which see. As grown in the southern 

 United States, the tea plant of commerce is raised from seeds 

 sown in late winter or early spring in nursery rows, the plants being 

 transferred to the plantation when a foot or more high. 



Thelesperma. Composites. 



One flower-garden annual is commonly grown, as Cosmidium 

 Burridgeanum, supposed to be a hybrid of T. trifidum and a core- 

 opsis : readily raised from seeds sown directly in the open or indoors 

 and transplanted. 



Theobroma (Chocolate-Tree). Sterculiacece. 



Chiefly important as including T. Cacao, the source of cocoa and 

 chocolate ; propagated by seeds sown before being dried. 



Thespesia. Malvaceae. 

 Grown from the seeds. 



Thevetia. Apocynacecs. 



Propagated by seed, or in the greenhouse by cuttings. T. nerei- 

 folia is the " yellow oleander" of Florida. 



Thrinax. Palmacece. 



Propagation by seeds in heat. See Palms, page 377. 



Thuja, including Biota (Arbor- Vitse. White Cedar, erroneously). 



Pinaceos. 



Propagated by seeds, which should be gathered as soon as ripe (in 

 the fall) and stratified or sown at once ; shade the seedlings the first 

 year. Also increased by layers, cuttings of green shoots in summer 

 in a cool frame and cuttings of ripe wood, as recommended for 

 retinospora. The named varieties are often grafted on potted com- 

 mon stocks in winter or early fall. 



Thujopsis. PinacecB. 



Propagated by seeds, cuttings and grafting, as for thuja. 



Thunbergia. Acanthacece. 



The flower-garden plant usually treated as an annual (T. alata) 

 grows readily from seeds. It is also grown under glass, as are other 

 species, from seeds and by cuttings taken from shoots after the 

 plant has been cut back in winter, as for allamanda. 



