240 



CONTRIBUTIONS FROM THE NATIONAL. HERBARIUM. 



tion Zone is typically a plains belt, but in the southern Rockies it 

 usually occupies the jniddle slopes of the mountains, at much greater 

 altitudes. On the west slope of the park it is poorly represented; 

 there are traces of it about Belton, as indicated by the presence of 

 yellow pine and western red cedar, together with a few characteristic 

 herbaceous species. Along the North Fork of the Flathead, on the 

 west boundary of the park, the yellow pines are said to be more 

 abundant, and the Transition Zone better developed. This latter 

 area was not visited by the writer. 



The only trees characteristic of the Transition Zone are the yellow 

 pine and red cedar, and these are not present on the east slope. 

 The common shrubs are the creeping cedar, water birch, white 

 clematis, bush cinquefoil, wild rose (Rosa hourgeauviana) , choke- 

 cherry, serviceberry, silverberry, a snowberry (SympJioricarpos 

 ocddentalis), and sagebrush. Of these, the creeping cedar, bush 

 cinquefoil, chokecherry, and serviceberry extend also into the 

 Canadian Zone. The following list includes the more common and 

 characteristic herbaceous plants. Those marked with an asterisk 

 extend also into the Canadian Zone. 



Typha latifolia. 

 Sagittaria cuneata. 

 Alisma brevipes. 

 Distichlis spicata. 

 Agropyron smithii. 

 Allium nuttallii. 

 Iris missouriensis. 

 Comandra pallida. 

 Rumex mexicanus. 

 Dondia depressa. 

 Atriplex hastata. 

 Chenopodium humile. 

 Chenopodium salinum. 

 Pulsatilla liidoviciana. 

 Halerpestes cymbalaria. 

 Physaria didymocarpa. 

 Lesquerella spathulata. 

 Potentilla anserina. 

 Potentilla pennsylvanica 

 Potentilla hippiana. 

 Thermo psis rhombifolia 

 Lupinus tenellus.* 

 Astragalus miser. 

 Astragalus goniatus. 

 Astragalus drummondii 

 Astragalus carolinianus. 

 Oxytropis defiexa. 

 Oxytropis gracilis.* 



Oxytropis splendens. 

 Mentzelia dispersa. 

 Gaura cocdnea. 

 Taraxia brevijlora. 

 Pachylophus caespitosus. 

 Hippuris vulgaris. 

 Zizia cor data. 

 Bupleurum americanum. 

 Gentiana affinis. 

 Navarretia viinima. 

 Lithospermum ruderale. 

 Allocarya calif ornica. 

 Oreocarya glomerata. 

 Pentstemon nitidus. 

 Orthocarpus luteus. 

 Pyrrocoma lanceolata. 

 Grindelia perennis. 

 Aster campestris. 

 Aster crassulus. 

 Erigeron caespitosus. 

 Helianthus subrhomboideus . 

 Artemisia frigida . 

 Artemisia biennis. 

 Madia glomerata. 

 Gaillardia aristata.* 

 Arnica foliosa. 

 Cirsium undulatum. 



