450 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
SPECIMENS EXAMINED: Chelan, Elmer 497, Walla Walla Region, Brandegee 957; Prosser, 
Cotton 658; Rattlesnake Mountains, Cotton 665. 
ZONAL DISTRIBUTION: Upper Sonoran. 
3. Centaurion muehlenbergii (Griseb.) W. F. Wight. 
Erythraea muehlenbergii Griseb. Gen. & Sp. Gent. 146. 1839. 
Erythraea curvistaminea Wittrock, Erythr. Exsicc. 2: 21. 1885. 
Type cocauity: ‘California.’ Collected by Douglas. 
Rance: Washington to California. 
SPECIMENS EXAMINED; Pullman, Piper 2649, 1622; Henderson 2272; Falcon Valley, 
Suksdorf, August 4, 1893. 
ZONAL DISTRIBUTION: Arid Transition. 
GENTIANA. GeEnTIAN. 
Annual; corolla without appendages in the sinuses. ..-...-... . Sec ee eee 1. G. acuta. 
Perennial; corolla with appendages in the sinuses. 
Uppermost pair of leaves forming an involucre about the 1 to 3 flowers. 2. @. calycosa. 
Uppermost leaves not involucrate. 
Corolla appendages entire. - wee eee ee ee eee eee eee eee BL. sceptrum. 
Corolla appendages laciniately cle it. 
Calyx lobes oblong to ovate-lanceolate....... 2.2.2.2... .-. 4. G. oregana. 
Calyx lobes linear to narrowly lanceolate. ._..............-- 5. @. affinis. 
1. Gentiana acuta Michx. Fl. 1: 177. 1803. 
Gentiana amarella acuta Herder, Act. Hort. Petrop. 1: 428. 1872. 
Gentiana anisose pala Greene, Pittonia 3: 309. 1898. 
Amarella anisosepala Greene, Leaflets 1: 53. 1904. 
Amarella macounii Greene, op. cit. 54. 
Type Locauiry: “In altis montibus Carolinae et in Canada, prope Tadoussack.”’ 
Rance: Alaska to Labrador, southward to Maine, Minnesota, New Mexico, and California. 
SPECIMENS EXAMINED; Padden Lake, Suksdorf 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. ¢. 146. 1888. 
Gentiana calycosa stricta Griseb. loc. cit. 
Gentiana gormani Howell, Fl. N. W. Am. 1: 446. 1901. 
Tyre Locauity: ‘Mt. Rainier,” Washington. Collected by Tolmie. 
Rance: British Columbia to California and Montana. 
SPECIMENS EXAMINED: Olympic Mountains, Piper 2224; Elmer 2727; Mount Rainier, 
Piper 2113; Allen 93; Baldy Peak, Olympic Mountains, Lamb 13382; Mount Adams, Hen- 
derson 33 and August 8, 1892; Suksdorf in 1878, Bridge Creek, Elmer 714; Horseshoe 
Basin, Lake & 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 @. parry: Engelm. 
3. Gentiana sceptrum Griseb. in Hook. FI. Bor. Am. 2: 57. 1838. 
Type Locauity: “Plentiful in low moist soil near Fort Vancouver,’ Washington. 
Collected by Douglas. 
Rance. 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, Proper in 1887; Fort Vancouver, Tolmie; 
llwaco, Henderson, September 9, 1892; without locality, Vasey in 1889. 
ZONAL DISTRIBUTION: Humid Transition. 
