Flora of the Palouse Region 137 



228. GENTIANA. 



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

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

 bell-shaped, 4-5-lobed, regular, without glands: usually with in- 

 termediate plaited folds which bear appendages at the sinuses, anth- 

 ers remaining straight with age: style stout, persistent or none; 

 stigmas 2. 



Flowers small: annual. G. amarki.LA. 



Flowers large: perennial. * G. oregana. 



G. amarella var. acuta Hook. f. Annual, erect, simple, or with few erect 

 branches, glabrous, 5-40 cm. high: leaves rather few, the basal spatulate-ob- 

 lanceolate, obtuse, petioled: cauline oblong-lanceolate, acute or obtuse, 

 sessile, .5-3 cm. 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. Open woods, Thatuna Hills. 



S. Oregana Engelm. Perennial, pale green, the stems erect, 15-50 cm. 

 high: leaves in numerous pairs, ovate, sessile, acuminate or obtuse, 2-4 cm. 

 long, the margins minutely scabrous: flowers few in a terminal cluster or 

 often many in racemose clusters: bracts oblong-lanceolate, short-petioled: 

 calyx-lobes lanceolate, a little longer than the tube: corolla deep blue, 2.5- 

 3.5 cm. long, the plaits extended into somewhat cleft appendages shorter 

 than the acute or acuminate lobes. Low or moist places, rather common. 



229. FRASERA. 



Tall, erect herbs, with mostly simple stems: leaves opposite or 

 whorled: flowers rather large, numerous, in open cymes arranged 

 in an elongated panicle: calyx deeply 4-parted: corolla 4-parted, 

 rotate, each lobe with a glandular and fringed pit on its face: 

 anthers oblong, remaining straight with age: stigma 2-lobed. 



Leaves narrow, opposite. I-', ai.bicaii.is. 



Leaves broad, whorled. F. thyrsiflora. 



F. albicaulis Dougl. Minutely puberulent throughout, pale-green: stems 

 erect, 15-45 cm - high: leaves opposite, mostly clustered at base, oblong-lan- 

 ceolate, obtuse, 3-nerved, with a white hard margin, 5-10 cm. long, the basal 

 ones narrowed into margined petioles: panicle narrow, its branches erect, 

 5—15 cm. long: calyx-lobes lanceolate, 6-10 mm. long: corolla blue, somewhat 

 exceeding the calyx: glands oblong, coarsely fringed, sac-like at base: scales 

 between the filaments cleft into thread-like lobes: pods Hat, twice as long as 

 the calyx, tipped by the persistent style: seeds dark, flat, rough. Hillsides, 

 not common. 



F. thyrsiflora Hook. Glabrous throughout: stems stout, 1-1.5 m. high: 

 leaves marginless, the basal ones spatulate-oblanceolate, abruptly acuminate 

 or obtuse, 15-40 cm. long, narrowed at base into a margined petiole; cauline 

 in whorls of 3, sessile, 8-20 cm. long: panicle terminal, 10-30 cm. long, 

 rather dense; bracts lanceolate or subulate: sepals attenuate-lanceolate, about 



