Southeastern Washington and Adjacent Idaho. 105 
situations but likewise occurs abundantly on the thin soil of the 
stony bottoms of intermittent streams. 
The Wet Meadow Associes 
The wet meadows occupy a zone lying intermediate in succes- 
sion between the Eleocharis-Carex associes on the one hand and 
the more mesophytic typé of prairie on the other. As would be 
anticipated, it shows all stages of the disappearance of relict 
members of the Eleocharis-Carex community which it frequently 
borders, as well as the invasion of the more mesophytic prairie 
species. 
However, the community as a whole is well defined and is es- 
pecially characterized by numerous socies. These wet meadows 
often occupy considerable areas, especially near the mountains, 
and under cultivation furnish an excellent yield of timothy. 
Omitting relicts of earlier communities, and many species 
found typically on moist hillsides, the following list gives the 
principal wet meadow species: 
Species Forming Distinct Socies.— 
Ouamasia quamash 
Ranunculus platyphyllus 
Heracleum lanatum Veratrum califormicum 
Iris muissouriensis Wyethia amplexicaulis 
Polygonum bistortoides e 
Deschampsia caespitosa 
Hookera hyacinthina 
Other Species — 
Calochortus nitidus 
Carex aperta 
Castilleja miniata 
Cicuta occidentalis 
Cogswellia triternata 
Delphinium simplex 
Epilobium adenocaulon 
Equisetum spp. 
Galium boreale 
Hordeum nodosum 
Hypericum scouleri 
Lupinus leucophyllus 
Mentha canadensis borealis 
Orthocarpus tenuifolius 
Poa annua 
Poa triflora 
Polygonum emersum 
Polygonum polygaloides 
Potentilla rectiformus 
Prunella vulgaris lanceolata 
105 
