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CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Polygonum greenei. 
Polygonum parryi. 
Ptilocalais nutans. 
Ptilonella scabra. 
Scribneria bolanderi, 
Scutellaria angustifolia. 
Sidalcea oregana, 
Trichostema oblongum, 
Trifolium ciliolatum. 
Trifolium cyathiferum. 
Urtica holosericea, 
Valerianella macrocera, 
Veratrum californicum. 
Wyethia angustifolia, 
Zygadenus venenosus. 
THE ROCKY MOUNTAIN ELEMENT, 
This consists of species which range from the foothills of the Rocky 
Mountains and related chains northward or northwestward into the 
Columbia Basin. Their number is much less than those of California 
origin. Among them are the following: 
Adenostegia capitata. 
Agoseris glauca. 
Antennaria dimorpha. 
Arabis holboelii. 
Artemisia dracunculoides. 
Cercocarpus ledifolius, 
Cornus stolonifera. 
Disporum majus. 
Hrigeron corymbosus. 
Eriogonum elatum. 
Eriogonum heracleoides. 
Erasera speciosa. 
Fritillaria pudica. 
Gaillardia aristata, 
Galium asperrimium. 
Gilia aggregata. 
Gratiola virginiana. 
Hookera douglasit. 
Lithospermum pilosum. 
Lomatium ambiguum. 
Lomatium grayi. 
Lupinus letcophyllus, 
Lycopus lucidus. 
Monolepis nuttalliana. 
Opulaster paucifiorus. 
Orthocarpus luteus. 
Ranunculus glaberrimus. 
Senecio serra, 
Silene menziesii. 
Solidago missouriensis. 
Steironema ciliatum. 
Synthyris rubra. 
Tellima tenella. 
Thermopsis montana. 
Valeriana ceratophylla. 
Wyethia amplexicaulis, 
THE COLUMBIA BASIN ELEMENT. 
Considering the recent geological origin of the Columbia Basin, 
the number of species peculiar to it both in the Upper Sonoran and 
Arid Transition areas is remarkably large. The number would be 
greatly increased by including Oregon forms that do not cross the 
Columbia River. The Arid Transition species are as follows: 
Allium douglasii. Claytonia dichotoma. 
Amelanchier basalticola. 
Antennaria geyeri. 
Antennaria stenophylla. 
Arabis cusickii. 
Artemisia rigida. 
Boisduvalia glabella. 
Castilleja camporum., 
Castilleja lutescens. 
Clarkia puichella. 
Eriogonum thymoides. 
Frasera albicaulis. 
Helianthella douglasii. 
Lonatium canbyi, 
Lomatium cous. 
Lomatium farinosum, 
Lomatium gormani. 
Lomatium watsoni. 
Orthocarpus barbatus. 
