450 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Specimens examined: Chelan, £"/»ier 497, Walla Walla Region, fi/am/ec/ee 957; I'rosser, 

 Cotton 658; Rattlesnake Mountains, Cotton 665. 

 Zonal distribution: Upper S<inoran. 



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



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



Erythraea cun-islamineaVk ittrock, Erythr. Exsicc. 2: 21. 1885. 



Type locality: "California." Collected by Douglas. 



Range: Washington to California. 



Speclmens EXA.MINED: Pullman, Piper 2649, 1622; Henderson 2272; Falcon Valley, 

 SuJcsdorf, August 4, 1893. , 



Zonal distribution : Arid Transition. 



QENTIANA. Gentian. 



Annual ; corolla without appendages in the sinuses 1. G. acuta. 



Perennial: corolla with appendages in the sinuses. 



Uppermost pair of leaves forming an involucre about the 1 to 3 flowers. 2. 6^. calycosa. 

 Uppennost leaves not involucrate. 



Corolla appendages entire 3. ^. sceptrum. 



Corolla appendages laciniately cleft. 



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



Calj'x lobes linear to narrowly lanceolate 5. G. affinis. 



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



Gentiana arnarella acuta Herder, Act. Hort. Petrop. 1: 428. 1872. 



Gentiana anisosepala Greene, Pittonia 3: 309. 1898. 



Arnarella anisosepala Greene, Leaflets 1: 53. 1904. 



Arnarella 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 e.xamined: Padden Lake, Suksdorf Q^; 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. <. U6. 1838. 

 Gentiana calycosa stricla Griseb. loc. cit. 



Gentiana gormani Howell, 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; Allen9^; Baldy Peak, Olympic Mountains, Lamb 1332; Mount Adams, Hen- 

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

 Basin, Lake <fc Hull 551; Gorman 757 (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 iow 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. 



