PIPER FLORA OF THE STATE OF WASHINGTON. 



43 



black pine {Pinus contorta) disputes the ground with the red fir. 

 Until the middle of July these prairies are carpeted with flowers 

 (PL X). After this time they present a distinctly arid appearance. 

 The flora consists of a considerable number of species which, so 

 far as Washington and Oregon are concerned, do not occur else- 

 where, though most of them range into California. Among them 

 are the following: 



Arenaria tenella. 

 Dodecatheon latifolium. 

 Erythronium ffiganteum. 

 Gilia tenella. 

 Godetia amoena. 

 Godetia quadrlvulnera. 

 Grindelia integrifolia. 

 Hemisonella durandi. 

 Hookera coronata. 

 Hooker a pulchclla. 

 Hosackia gracilis. 

 Iris tenax. 



Lomatium utriculatum. 

 Lupinus albicaulis. 



Lupinus lepidus. 

 Microseris lacimiata. 

 Orthocarpus a t ten uatus. 

 Platystigma oreganum. 

 Ranunculus orthorhynchus. 

 Senecio fastigiata. 

 Scricocarpus rigidus. 

 Solidago tolmieana. 

 Synthyris rot utidi folia. 

 Trifolimn hallii. 

 TrifoUuni tridentatum. 

 Valerianella congesta. 

 Viola howelUi. 



A nmch larger number of species, how^ever, recur in the Arid 

 Transition area east of the Cascade Mountains. Nearly all of these 

 species are limited to the Pacific coast, ranging from California 

 northward to British Columbia on both sides of the Cascade Moun- 

 tains. Here, as in the case of the Upper Sonoran species of Califor- 

 nia origin, there is good reason to believe that most of the species 

 reached the Columbia Basin through the Klamath Gap. Character- 

 istic examples are the following: 



Agoscris heterophylla. 

 Alchemilla occidentalis. 

 Alsine nitons. 

 Antennaria hoivcUii. 

 Athysamis pusilluj^. 

 BalsamorMza halsavwrhiza. 

 Balsamorhiza drltoidea. 

 Boisduvalia stricta. 

 Carum gairdneri. 

 Caucalis microcarpa. ' 

 Ceanothus sanguineus. 

 Collinsia grandiflora. 

 Crocidium multieaulc. 

 Eriocephalum lanatum. 

 Erigeron speciosns. 

 Gilia capitata. 

 Gilia gracilis. 

 Githopsis speeularioides. 

 Heterocodon rariflorum. 

 Heuchera cylindriea. 

 Hieracium scouleri. 



Hookera hyacinthina. 

 Hosackia decumhens. 

 Lomatium nudicaule. 

 Lomatium triternatum. 

 Micrampelis oregana. 

 Navarretia inter tcxta. 

 Pectocarya penicillata. 

 Pinus ponderosa. 

 Polemonium micrantJium. 

 Prunus demissa. 

 Psilocarphus elatior. 

 Qucrcus garrpana. 

 Sedum douglasii. 

 Sidalcea eampestris. 

 Silene menziesii. 

 Sisyrinchium grandiflortim. 

 Tellima parviflora. 

 Thysanocarpus eurvipes. 

 Tonella collinsioides. 

 Zygadenus venenosus. 



