RYDBERG: PHYTOGEOGRAPHICAL NOTE 319 
Muhlenbergia filiformis 
Juncus Mertensianus 
Crunocallis Chamissonis 
Parnassia fimbriata 
Agrostis depressat 
Cardamine cordifolia 
Cardamine infaustat 
Radicula alpina 
Micranthes rhomboidea 
WESTERN 
Micranthes arguta 
Androsace filiformis 
Mimulus Langsdorfi 
3. ENDEMIC 
Micranthes arnoglossa 
Oxypolis Fendlerit 
Primula incana 
Pleurogyne fontana — 
Mimulus puberulus 
D. SANDY RIVER BANKS 
The flora of the sandy river banks and sand-flats along the 
water courses is very meager. Besides some of the species which 
are enumerated below, under the heading ‘‘Sand-draws,”’ there 
are found the following which require more moisture :— 
Tillaeastrum aquaticum* 
Gilia calcareayt 
Androsace filiformis 
Androsace diffusat 
Androsace subuliferat 
Mimulus moschatus 
Mimulus puberulus 
Limosella aquatica* 
Erigeron minor 
Eleocharis acicularis 
Scirpus pauciflorus 
Muhlenbergia Wolfitt 
Sagina saginoides 
Alsinopsis macranthat 
Myosurus aristulatus 
Ranunculus reptans 
Halerpestes Cymbalaria 
Radicula alpina 
Subularia aquatica* 
E. ALLUVIAL RIVER BANKS 
The formations on the alluvial river banks and river flats are 
of three kinds. Along the smaller brooks, especially in the upper 
portion of the zone, they resemble much those of the Subalpine 
Zone, the most important plants being species of Mertensia, 
Epilobium and Juncoides. In the lower part of the zone Urtica 
gracilis and various composites constitute the greater part of the 
vegetation. At middle altitudes species of Delphinitum and Aco- 
nitum often take their places. Very few of the plants are trans- 
continental or eastern. 
* Growing mostly in shallow water with sandy bottom. 
