Naturalisation in Extra-Tropical Countries. 485 



Trichostema lanatum, Bentham. 



California, where it is called the " Black Sage." A half-shrub, 

 recorded by Mr. A. J. Cook in the " Bee-keepers' Guide " among 

 important honey-plants. 



Trifolium agrarium, Dodoens. (T. aureum, Pollich.) 



The Perennial Yellow Clover or Hop-Clover. All Europe, 

 Northern Africa, Western Asia ; wild in Norway northward to lat. 

 63 26' [Schuebeler]. Of considerable value in sandy soil as a 

 fodder-herb. It is easily naturalised. 



Trifolium Alexandrinum, Linne.* 



The Bersin- Clover. North-Eastern Africa, South- Western Asia, 

 South-Europe. Much grown for forage in Egypt, where it is used 

 as the main-fodder. On the Nile it gives three green crops during 

 the season, each up to 2 feet high. Seeds of this and other clovers 

 must be sifted, to free them from any of the destructive Dodder- 

 plants or Cuscutas. About 20 Ibs. of seed are required for an acre 

 [Morton]. Recorded as annual. 



Trifolium alpestre, Linne. 



Europe. Western Asia. Perennial. Content with lighter soil 

 than that needed for most clovers, but the constituents must be 

 fairly marly or limy. This clover is early out and very palatable 

 to herds and flocks [Langethal]. 



Trifolium fragiferum, Vaillant.* 



The Strawberry-Clover. Europe, North- Africa, Middle and 

 Northern- Asia. Indigenous in Norway to lat. 59 55'. A perennial 

 species, well adapted for clay-soils. Foliage closer and more tender 

 than that of the white clover, but its vegetation later [Langethal]. 

 Morton recommends it for moist sandy soil. It delights in ground 

 much wetter than suits most other clovers ; it spreads over humid 

 pastures most readily, with a growth more luxuriant than that of 

 white clover, consequently stands the summer-heat better, smother- 

 ing most other plants and covering the ground with a thick and 

 close herbage. Cattle are very fond of it, and fatten well on it 

 [Geo. Black]. 



Trifolium furcatum, Lindley. 



California. A stout and somewhat succulent species, with large 

 flower-heads, Affords good pasturage [A. Grayl, and gets dis- 

 seminated readily; but it is annual. Several other native clovers 

 occur in Western North- America ; 25 are described from Cali* 

 formia. 



