450 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Specimens examined: Che]an, Elmer 497, Walla Walla Region, 5ra«(^e^ee 957; Prosser, 

 Cotton 658; Rattlesnake Mountains, Cotton 665. 

 Zonal distribution: Upper Sonoran. 



3. Centaurion muehlenbergii (Griseb.) W. F. Wight. 



Erythraea muehlenhergii Griseb. Gen. & Sp. Gent. 146. 1839. 



Erythraea curvisfaminea yVittrock, Erythr. Exsicc. 2: 21. 1885. 



Type locality: "California." Collected by Douglas. 



Range: Washington to California. 



Specimens examined: Pullman, Piper 2649, 1622; Henderson 2272; Falcon Valley, 

 Suksdorf, August 4, 1893. 



Zonal distribution: Arid Transition. 



GENTIANA. Gentian. 



Annual ; corolla without appendages in the sinuses \. G. acuta. 



Perennial; corolla with appendages in the sinuses. 



Uppermost pair of leaves forming an involucre about the 1 to 3 flowers. 2. C calycosa. 

 Uppermost leaves not involucrate. 



Corolla appendages entire 3. G. sceptrum. 



Corolla appendages laciniately cleft. 



Calyx lobes oblong to ovate-lanceolate 4. 6^. oregana. 



Calyx lobes linear to narrowly lanceolate 5. G. affinis. 



1. Gentiana acuta Michx. Fl. 1: 177. 1803. 



Genliana ainaitlla acuta Herder, Act. Hort. Petrop. 1: 428. 1872. 



Gentiana anisosepala Greene, Pittonia 3: 309. 1898. 



Amarella anisosepala Greene, Leaflets 1: 53. 1904. 



Amarella macounii Greene, op. cit. 54. 



Type locality: "In altis montibus Carolinae et in Canada, prope Tadoussack." 



Range: Alaska to Labrador, southward to Maine, Minnesota, New Mexico, and California. 



Specimens examined: Padden Lake, SuJcsdorf 990; Cascade Mountains, 49°, Lyall in 

 1859; Whidby Island, Gardner 202; Fidalgo Island, Flett 2111; East Sound, Henderson, 

 July 3, 1892. 



Zonal distribution: Transition. 



2. Gentiana calycosa Griseb. in Hook. Fl. Bor. Am. 2: 58. 1. 146. 1838. 

 Gentiana calycosa stricta Griseb. loc. cit. 



Gentiana gormani Plowell, Fl. N. W. Am. 1: 446. 1901. 



Type locality: "Mt. Rainier," Washington. Collected by Tolmie. 



Range: British Columbia to California and Montana. 



Specimens examined: Olympic Mountains, Piper 2224; Elmer 2727; Mount Rainier, 

 Piper 2113; .4//en93; Baldy Peak, Olympic Mountains, Lamh 1332; Mount Adams, Hen- 

 derson 33 and August 8, 1892; Suksdorf in 1878; Bridge Creek, Elmer 714; Horseshoe 

 Basin, Lake d- Hull 551; Gorman Ibl (type collection of Gentiana gormani Howell). 



Zonal distribution: Arctic. 



In Lyall's report this species was confused with the Rocky Mountains G. parryi Engelm. 



3. Gentiana sceptrum Griseb. in Hook. Fl. Bor. Am. 2: 57. 1838. 



Type locality: "Plentiful in low moist soil near Fort Vancouver," Washington. 

 Collected by Douglas. 



Range. British Columbia to Oregon west of the Cascade Mountains. 



Specimens examined: Chambers Lake, Henderson, August 23, 1892; between Union 

 City and Shelton, Piper in 1890, Segualiche Lake, Piper in 1887; Fort Vancouver, Tolmie; 

 llwaco, Henderson, September 9, 1892; without locality, Vasey in 1889. 



Zonal distribution: Humid Transition. 



