RYDBERG: PHYTOGEOGRAPHICAL NOTES 449 
Chenopodium Fremontit — 
Silene Scouleri 
Thalictrum megacarpum 
Atragene tenuiloba 
Ranunculus Earlett 
Delphinum robustumt 
Delphinum elongatum 
Delphinum ramosumt 
Sophia leptophylla 
Sophia incisat 
Sophia procerat 
Fragaria glauca 
Lupinus floribundust 
Lupinus parviflorus 
Lupinus pulcherrimus 
Lupinus humicola 
Homalobus tenellus 
Lathyrus brachycalyxt 
Lathyrus leucanthust 
Lathyrus arizonicust 
Sidalcea candidat 
Oxypolis Fendlerit 
Apocynum scopulorum 
Polemonium foliosissimumf 
Hydrophyllum Fendlerit 
Agastache pallidiflorat 
A gastache urtictfolia 
Moldavica parviflora 
Scrophularta occidentalis 
Castilleja Crista-galla 
Castilleja rhextfolia 
Castilleja sulphurea 
Pedicularis Graytt 
Galium flaviflorumt 
Valeriana micrantha 
Eucephalus glaucust 
Aster ciliomarginatus 
Aster adscendens 
Erigeron yellowstonensts 
Erigeron superbust 
Helianthella quinquenervis 
Anaphalis subalpina 
Arnica subplumosa 
V. ALDER-WILLOW SWAMPS 
These are found in the wetter parts of the valleys, where the 
drainage is rather poor. They contain many of the species found 
in the preceding formation but also many belonging to the Sedge 
Bog. The most important woods belonging to the formation are 
the Rocky Mountain alder, Alnus tenuifolia, the western black 
birch, Betula fontinalis, and several species of willows. In the 
upper part of the zone, the formation becomes more and more 
like the willow bogs of the Subalpine Zone.* 
1. TREES AND SHRUBS 
a. Eastern 
Salix chlorophylla Salix cordata 
* See Bull. Torrey Club 44: 449-450. 1917. 
