IN EXTBA-TROPICAL COTJNTaiES. 251 



Poa airoides, Koeler. {Catabrosa aquatica, Beauvois.) 



Europe, North Africa, North and Middle Asia, North 

 America. The Water-whorl Grass. A creeping grass, suit- 

 able for soil subject to inundation. 



Poa alpina, Linne. 



Alpine and Arctic Europe, Asia, and North America. De- 

 serves to be transferred to snowy mountains as a nutri- 

 tious perennial pasture-grass. P. Sudetica (Haenke) and 

 P. hybrida (Guadin) are mentioned also as excellent Alpine 



Poa angustifolia, Linn^. 



Europe, North Asia, North America. A perennial pasture- 

 grass, allied to P. nemorahs. An excellent grass for moist 

 meadows and river banks. Poa fertilis (Host.) may be a mere 

 variety of this species. 



Poa aquatica, Linne. {Gh/ceria aquatica, Smith.) 



Europe, North and Middle Asia, North America, This con- 

 spicuous Water-grass attains a height of 6 feet. It is per- 

 ennial, and deserves naturalisation in our swamps. It pro- 

 duces a large bulk of foliage, and may be disseminated for 

 fodder purposes. 



Poa Billardieri, Steudel. 



Australia. A perennial rigid grass, of some value for saline 

 meadows. 



Poa Brownii, Kunth. {Eragrostis Brownii, Nees.) 



Tropical and Eastern extra-tropical Australia. It is here men- 

 tioned as a valuable perennial species, keeping beautifully 

 green in the driest Australian summer, even on poor soil. The 

 section Eragrostis of the genus Poa contains numerous species 

 in the hotter parts of the globe. Of these many would doubt- 

 less be hardy and prove of value as pasture in temperate climes. 



Poa Canadensis, Beauvois. 



The Rattlesnake Grass of South-East America. A valuable 

 swamp-grass. 



Poa Chinensis, Koenig. 



South and East Asia, East Australia. Recommended by Mr. 

 F. M. Bailey as a valuable pasture grass, perhaps on account 



