72 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
origin is comparatively recent. It is worthy of note that a large pro- 
. portion of them are habitants of the higher granitic portions of the 
mountains. The list is as follows: 
SPECIES CONFINED TO THE BLUE MOUNTAINS. 
4 
Allium collinum. Lomatium oreganum. 
Allium macrum. Lupinus cusickii, 
Allium madidum. Lupinus sabinei. 
Aragallus cusickii. Lupinus sulphureus. 
Calamagrostis cusickii. Madia ramosa. 
Castilleja cusickii. Pentstemon cusickii. 
Castilleja rubida. Pentstemon venustus. 
Castilleja rustica. Phaca cusickii. 
Draba cusickii. Physaria oregana, 
Elymus nitidus. Potentilla brevifolia. 
Brigeron chrysopsidis. Primula cusickiana. 
Frigeron membranaceus. Pteryxia foeniculacea. 
Eriogonum strictum. Pteryvia thapsoides. 
Frasera cusickii. Quamasia cusickii. 
Lappula hispida. Ranunculus populago. 
Lathyrus cusickii. Senecio condensatus. 
Lathyrus rigidus. Sitanion latifolium. 
Lomatium cusickii. Townsendia alpigena. 
The Rocky Mountain element consists of a considerable number of 
species, including some genera which otherwise do not occur in 
Washington or Oregon. Most of these are confined to the higher 
granitic peaks, very few occurring within Washington limits. The 
presence of this Rocky Mountain element is undoubtedly a direct 
result of immediate contiguity, though the species may have been 
isolated on these remote peaks for a long period. It is noteworthy 
that a number of the list reach the Sierra Nevada but not the Cas- 
cades. The species are as follows: 
SPECIES THAT OCCUR ALSO IN THE ROCKIES BUT NOT IN THE CASCADES. 
Androsace septentrionalis. Britrichium elongatum. 
. Anemone parviflora. Galium bifolium. 
Arabis microphylla. Hedysarum mackenzii. 
Aster elegans. Lepidium montanum. 
Aster integrifolius. Leucocrinum wnoellatum. 
Aster scopulorum. Ligusticum tenuifolium. 
Carer hystricina. Peraphyllim ramosissimum. 
Conioselinum scopulorum. Phaca aboriginum. 
Corallorhiza corallorhiza. Phaca kentrophyta. 
Draba alpina, ‘Polemonium confertum. 
Draba glacialis. Pinus flexilis, 
Erigeron armeriaefolius. Salix fernaldii. 
Erigeron coulteri. Senecio renifolius. 
Eriogonum piperi. Thlaspi glauca. 
