February 28,1907, > 29 
or less quantities according to the condition of the soil and the 
amount of water that the plants receive: 
Juncus balticus Carex athrostachya 
Juncus bufonius Carex aquatilis 
Juncns longistylis Carex lanuginosa 
Juncus Nevadensis Carex marcida 
Juncus xiphioides Carex Nebrascensis 
Carex ampullacea Eleocharis arenicola 
Triglochin maritima Eleocharis palustris 
Scirpus lacustris Scirpus occidentalis 
Scirpus microcarpus Trifolium spinulosum 
Poa Nevadensis? Poa laevigata? % 
Poa sp. Cyperus inflexus? 
These meadows and swamps are very similar in many re: 
spects to those occurring in other parts of the State along the 
Humboldt river. The main striking difference is the absence 
of Elymus tritecordes and E. condensatus. Until further study 
is made it is difficult to state whether they belong to the Lowet 
Arid Transition area or to the Upper Sonoran. 
CANADIAN ZONE 
At the upper limits of the yellow pine forests we find many 
small meadows which are surrounded by dense groves of mag- 
nificent specimens of the Murray pine (P:zus Murrayana). It 
seems to be necessary for it to have plenty of moisture, hence it 
remains at elevations of from 7000 to gooo feet. There are also 
two other species that occur in such limited quantities that they 
are of great interest. On a protected slope facing the north and 
very precipitous, but well covered with snow until very late in 
the season, we find a grove of alpine hemlock (7suga Mertenst- 
ana). ‘The slope is well protected from the arid winds of the 
east by a high ridge, and the south sun never strikes it. Some- 
what lower, but also in a protected canyon, a few trees of Pzmus 
monticola have been discovered among the yellow pines. 
This zone is so scattered and of such limited extent that it 
would be difficult to give a list of plants that could not be found 
