288 GENTIANACEAE. 



form, 4- or 5-parted, the tube slender; anthers exserted, erect, 

 oblong to linear, twisting spirally with age; style filiform, usually 

 deciduous; stigmas capitate or 2-lipped. 



Basal leaves in a rosette. C. centaurium. 



Basal leaves not in a rosette. C. minimum. 



Centaurium centaurium (L.) W. F. Wight. Glabrous; stems 15-30 cm. 

 high; leaves oblong, acutish, 2-5 cm. long, the cauline sessile, the basal petioled 

 and forming a rosette; flowers numerous, in a compound flat-topped cyme; 

 corolla red, 10 mm. long, its lobes obtuse. 



In waste places, introduced from Europe. 



Centaurium minimum (Howell) Piper n. comb. (Erytkraea minima 

 Howell.) Stems filiform, simple or sparingly branched, 1-2 inches high; 

 leaves lanceolate, acute, 2-6 mm. long; flowers racemosely disposed, all 

 pedicellate; lobes of the pink or white corolla lanceolate, acute, 4 mm. long, 

 more than half as long as the tube; anthers oblong; lobes of the style fan- 

 shaped; seeds globular, strongly pitted. 



"In wet places, throughout western Oregon.'' From the description the 

 plant is very closely allied to C. muhlenbergii (Griseb.) W. F. Wight. 



399. GENTIANA. Gentian. 



Herbs; leaves opposite; flowers solitary or in cymes, showy, in 

 late summer or autumn; calyx 4- or 5-cleft; corolla funnelform or 

 bell-shaped, 4- or 5-lobed, regular, without glands, often with in- 

 termediate plaited folds which bear appendages at the sinuses; 

 anthers remaining straight with age; style stout, persistent or 

 none; stigmas 2. 



Annuals; corollas small, less than 2 cm. long. 



Corolla without appendages between the lobes. G. acuta. 



Corolla with bifid appendages between the lobes. G. douglasiana. 



Perennials; corollas 3 cm. or more long, with appendages be- 

 tween the lobes. 



Stems 15-30 cm. high, clustered, mostly 1-flowered. G. calycosa. 



Stems taller, mostly solitary, several-many-flowered. G. sceptrum. 



Gentiana acuta Michx. Annual, erect, simple, or with few erect branches, 

 glabrous, 5-40 cm. high; leaves rather few, the basal spatulate-oblanceolate, 

 obtuse, petioled; cauline oblong-lanceolate, acute or obtuse, sessile, 5-30 mm. 

 long; peduncles from the axils of most of the leaves, 1-4 cm. long; calyx cleft 

 below the middle, the lobes acute, usually very unequal; corolla 5—15 mm. 

 long, without folds in the sinuses, the acutish lobes with a fringe of bristles on 

 their bases within. 



In open woods, rare in our limits. 



Gentiana douglasiana Bong. Annual; stems slender, cymosely branched, 

 10-20 cm. high; leaves ovate, the basal ones in a rosette, the cauline several 

 pairs, 4-8 mm. long; flowers white, in a loose cyme; calyx 5-cleft; corolla 8 mm. 

 long, funnelform, with oblong lobes shorter than the tube, the accessory lobes 

 2-cleft; capsule stalked. 



In bogs, Alaska to Vancouver Island, British Columbia; Port Renfrew, 

 British Columbia, Rosendahl & Brand. Said to have been collected near 

 Snohomish, Washington, and reported by Hooker from Fort Vancouver, 

 Washington. 



