IOWA ACADEMY OF SCIENCES. 
91 
The plants of the Finns ponderosa woods consist of Rubus 
nutkanuSy Prunus demissa, Philadelphus microphyllus, Amel- 
anchier alnifolia, Betula occidentalism Geranium fremontiim 
Berberis repens. In the swamps along the streams, Rubus 
nutkanuSm Aconitum columbianumy Alnus incana var. vires- 
cenSm Betula occidentalism Erigeron corymbosus, E. glabellus, 
and jE'. salsuginosusm Aster adscendens and Dodecatheon media^ 
Bromus marginatus, Amelanchier alnifoliam Pedicularis 
groenlandica and Ledum glandulosumm Heracleum lanatumm 
Thalictrum sparsiflorumm Symphoricarpos racemosus, Parn- 
assiapalustris, Lonicera involucrata and Cratcegus rivularis. 
Between 5,000 and 6,000 feet on Overwhich creek there 
are few open marshes. Along the banks of the streams the 
following plants were noted: 
Dodecatheon media, Mimulus lewisii, Calamagrostis hyper- 
borea, Pyrus arbutifolia, Aconitum columbianum, Thalictrum 
sparsiflorum, Saxifraga virginiensis. Ledum glandulosum, 
Lonicera involucrata, Angelica lyalli, Ligusticum apiifolium. 
DOUGLAS SPRUCE ZONE. 
The Pseudotsuga zone occurs beyond the Finns ponderosa , 
although the two overlap. The Douglas Spruce occurs in 
more shady and moist situations. The dominance of the 
different species of conifers is shown in the following 
table: 
