Naturalisation in Extra-Tropical Countries. 549 



Uniola paniculata, Linne\ 



North-Eastern America. This tall maritime grass can be chosen 

 on account of its creeping roots, to bind rolling coast-sands. 



Urena lobata, Linne\ 



Intra-tropic girdle around the globe. This perennial herb has 

 recently been enumerated among plants with comparatively tenacious 

 fibre ; it can be reared far beyond the tropics. Some congeneric 

 plants can similarly be utilised. Probably objectionable near sheep- 

 runs on account of the minute prickles of its fruits. 



Urginea Scilla, Steinheil. (Scilla ynaritima, Linne". 



The medicinal Squill. Countries around the Mediterranean Sea, 

 Canary Islands. Already ordered by Charles the Great to be grown 

 in the imperial gardens. This coast-plant needs no regular cultiva- 

 tion ; but settlers living near the sea might encourage its dissemina- 

 tion, and thus obtain the bulbs as drugs from natural localities. Its 

 peculiar bitter principle is called scillitin. The bulb contains 24 per 

 cent, tannin. U. altissima (Baker) serves in South-Africa as squill. 



Usnea barbata, Weber. 



Most countries of the globe, often pendent from branches of trees. 

 This Lichen with its congeners and some other plants of this order 

 is appreciable and readily obtainable as packing material of pervious- 

 ness, elasticity, lightness and resistance for fresh fruits, bulbs and 

 tubers intended for lengthened transit. The Usneas are also of some 

 value for medicinal and dyeing purposes. 



Uvularia sessilifolia, Linne". 



North-America, in forests. This pretty herb is mentioned as 

 yielding a good substitute for asparagus. 



Vaccinium alatum, Dombey. ( Thibaudia alata, Dunal. ) 



Frigid regions of the Andes of Peru. A tall evergreen shrub, 

 with pink berries of the size of a cherry. This highly ornamental 

 plant could be grown in sub-alpine regions for its fruits. 



Vaccinium Arctostaphylos, Linne. 



From Greece to the Caucasus. The leaves, dried and slightly 

 heated, furnish the Broussa-tea or Trebizond-tea, the material for a 

 fairly palatable beverage [G. Maw], possibly of medicinal value. 

 Dr. G. Dieck praises the berries as very relishable. 



Vaccinium bicolor, F. v. Mueller. (Thibaudia bicolor, Ruiz and Pavon.) 



Colder zones of the Peruvian Andes. A high evergreen bush, with 

 red berries of about the size of a hazel-nut. All Thibaudias seem 

 best to form a section in the genus Vacciuium, some species of the 



