148 Flora of the Palousc Region 



244. MERTENSIA. 



Perennial, often smooth and glabrous: flowers blue or rarely 

 white, mostly braetless: calyx deeply 5-eleft or parted: corolla tub- 

 ular-funnelform or trumpet-shaped to almost campanulate, the 

 open throat bearing obvious or obsolete transverse folds for crests: 

 filaments flattened or nearly filiform: style filiform: stigma entire: 

 nutlets from somewhat flesh}' to membranaceous, not armed with 

 barbed prickles. 



Low plant: corolla 20 mm. long. M. oblongifoua. 



Tall plant: corolla 10-14 mm. long. M. panicui*ata. 



M. oblongifolia Don. (M. longiflora Greene.) Stems simple, 10-20 cm. 

 high, glabrous or nearly so: leaves sessile, oblong, obtuse or acute, 2-6 cm. 

 long, glabrous above, minutely hispid beneath: flowers in a dense cluster, 

 nodding: calyx deeply 5-cleft, the lobes linear-lanceolate, acute, minutely 

 hispid-ciliate: corolla 2 cm. long, the tube two to three times as long as the 

 calyx; limb campanulate, 5-6 mm. long. Moist hillsides, not plentiful. 



M. paniculata Don. Tall, erect, branched above, 30-120 cm. high, the 

 stems sparsely hairy: leaves ovate or ovate-lanceolate, acuminate, rounded or 

 cuneate at base, sparsely hispid on both sides, 3-10 cm. long; lower petioles 

 slender, nearly as long as the blades; upper short: racemes few-flowered, 

 loosely panicled; pedicels slender: calyx-tube hair)', the lobes lanceolate: 

 corolla blue, 8-14 mm. long, its tube twice as long as the calyx, little longer 

 than the limb. Rich woods, Cedar Mountain. 



245. AMSINCKIA. 



Rough-hispid annuals: leaves oblong or linear: corolla salver- 

 form or tubular-funnelform with a slender tube and open throat, 

 the limb sometimes plaited at the sinuses, yellow: style filiform; 

 stigma capitate or 2-parted: nutlets crustaceous or coriaceous, un- 

 appendaged, ovate-triangular, attached below the middle to an ob- 

 long-pyramidal gynobase. 



A. intermedia Fischer & Meyer. Erect, usually simple, 30-60 cm. high, 

 the bristly hairs mostly white: leaves lanceolate or linear, 5-12 cm. long, 

 the upper somewhat broader at base: raceme becoming much elongated in 

 fruit: calyx-lobes linear, acute, very bristly in fruit, 6-8 mm. long: corolla 

 yellow, 5-6 mm. long: nutlets dark-colored, the back convex and somewhat 

 keeled, obliquely ridged and roughened with tubercles. A troublesome 

 weed, most common along Snake River. 



246. MYOvSOTlS. 



Low spreading herbs, usually soft-hairy: cauline leaves sessile: 

 flowers mostly blue, in at length elongated racemes, without 

 bracts: corolla short-salverform or almost rotate, its throat con- 

 tracted by transverse crests, the rounded lobes convolute in the 



