Flora of the Pa louse Region 103 



167. LUPINUS. 



Herbs, rarely shrubs: leaves alternate, palmately 5-1 i-foliolate: 

 flowers showy, often whorled, in terminal spikes or racemes: calyx 

 2-lipped, the upper lip often bifid, the lower sometimes 3-toothed: 

 standard orbicular with reflexed sides; wings obovate, united at 

 the summit and enclosing the falcate keel: stamens united into a 

 closed tube: ovary sessile: pod more or less flattish, leathery and 

 hairy. 



Pubescence silky or silky-villous. 



Calyx somewhat spurred. L. laxifi.orus. 



Calyx spurless: flowers pedicelled. L. SERICEUS. 



Calyx spurless: flowers nearly sessile. L. LEUCoph yixus. 



Pubescence hirsute or villous, not silky. L. wyethii. 



L. laxifloms Dougl. Rather slender, about 60 cm. high; pubescence 

 finely-silky, but the plant green: leaflets 6-11, oblanceolate, obtuse or acute, 

 silky on both sides, 3-4 cm. long; petioles slender, usually twice as long as 

 the leaflets, or none: racemes loose, 10-15 crn - l° n g; pedicels slender, 5-6 

 mm. long: calyx short, spurred at base: corolla about r cm. long; stand- 

 ard glabrous or pubescent. Open woods, Thatuna Hills. - 



L. sericeus Pursh. Pubescence silky or silky-villous, the whole plant 

 silvery-green, 30-40 cm. high; leaflets 6-8, oblanceolate, acute, pubescent on 

 both sides, 2-4 cm. long; petioles as long or longer: racemes rather loose, 

 short-peduncled: flowers almost 10 mm. long, stout-pedicelled: standard 

 hairj-. Common everywhere. 



L. leucophyllus Dougl. Densely silky-villous and somewhat tomentose, 

 erect, 60-90 cm. high: leaflets 7-10, oblanceolate, acute or acuminate, pub- 

 escent on both sides, 3-6 cm. long; petioles about as long: flowers sessile or 

 nearly so, in elongated short-peduncled dense racemes, often 30-40 cm. long; 

 bracts narrow, exceeding the buds: corolla about 8 mm. long; standard 

 somewhat hairy on the back. Common in low ground. 



L. Wyethii Wats. Villous, not silky, erect, 30-50 cm. high: leaflets 7-1 1, 

 oblanceolate, acute or acuminate, 2-4 cm. long, glabrous above; petioles 2-4 

 times as long as the leaflets: racemes strict, 15-30 cm. long; pedicels slender: 

 flowers dark-blue, 10-15 mm - long: standard glabrous. A very showy 

 species, locally abundant, especially near Snake River. 



[68. MEULOTUS. 



Annual or biennial herbs: leaves pinnately 3-foliolate; lea (lets 

 denticulate: flowers in racemes: calyx campanulate, with short 

 equal teeth: corolla deciduous, free from the stamen-tube: stamens 

 diadelphous; anthers all alike: ovary sessile or stipitate, few- 

 ovuled: pod coriaceous, 1 2-seeded. 



M. alba Desv. Biennial, stout, erect, branching, 1-2 111. high, finely 

 puberulent or nearly glabrous: leaves slender-petioled; leaflets oblong or ob- 

 pvate, denticulate, mostly truncate at apex, 1-2 cm. long; stipules subulate: 



