422 BORAGINACEAE ^BORAGE FAMILY) 



9. Mertiensia Tweedyi Rydb. Mem. N. Y. Bot. Card. 1: 336. 1900. Stems 

 low, loosely tufted, decumbent at base, 8-15 cm. long: leaves minutely strig- 

 illose and papillose above, dark green, oblong to spatulate, subacute: calyx- 

 lobes lance-linear, ciliate, about half as long as the corolla-tube: corolla dark 

 blue, 8-10 mm. long, limb and tube subequal : stamens included in the throat, 

 filaments very short: style short. High mountains; Wyoming and northward. 



10. Mertensia viridis A. Nels. Bull. Torr. Bot. Club 26: 244. 1899. Root- 

 stocks woody, creeping in the crevices among the rocks; stems slender, rather 

 weak, decumbent at base, 2-4 dm. long, glabrous or sparsely hispidulous: 

 leaves bright green, minutely hispidulous above; radical oblong to elliptic, 

 4-6 cm. long, on longer slender petioles; cauline oblong, smaller and acutish 

 upward: panicle leafy-bracteate; peduncle and pedicels slender; corolla about 

 1 cm. long, the tube exceeding the limb and about twice the length of the 

 sepals: filaments narrower than the anthers. High rocky summits; Wyo- 

 ming and Colorado. 



11. Mertensia coronata A. Nels. Bull. Torr. Bot. Club 29: 403. 1902. 

 Tufted, from large friable roots; stems shining, assurgent, 2-4 dm. long: 

 leaves numerous, large for the plant, minutely scabrous above (the hairs 

 short, curved, and sometimes early deciduous from the small pustulate 

 base); radical oblong, 5-10 cm. long, on petioles 2-3 times as long; cauline 

 smaller, and becoming sessile and ovate-lanceolate above: flower clusters 

 terminal and axillary, at length open-paniculate among the floral leaves: 

 calyx-lobes triangular-lanceolate, sparingly ciliate : corolla-tube rather broad, 

 5 mm. long, exceeding the calyx; limb shorter than the tube, the lobes sub- 

 orbicular, abruptly dilated from the rounded sinus: stamens inserted below 

 the conspicuous crown of crests in the throat; the filaments broader than the 

 anthers. Western Wyoming to Idaho and Montana. 



12. Mertensia lanceolata (Pursh) DC. Prod. 10: 88. 1846. Minutely 

 pubescent on upper face of leaves, otherwise glabrous and glaucescent ; stems 

 simple or at length paniculately branched, 2-4 dm. high: leaves spatulate- 

 oblong to lanceolate-linear, 3-5 cm. long, obtuse to acute, semifleshy: raceme 

 becoming loosely panicled : calyx-lobes lanceolate, ciliate, one half to nearly 

 as long as the corolla-tube, which usually exceeds the subcampanulate throat 

 and limb: corolla-tube hairy at the base within: filaments inserted in the 

 throat, longer than the anther: style capillary, nearly as long as the corolla. 

 Plains and open hills; Colorado and Wyoming. 



12a. Mertensia lanceolata brachyloba (Greene) A. Nels. Calyx turbinate, 

 the broad lobes shorter than the tube: corolla-tube scarcely equaling the limb. 

 M. brachyloba Greene, Pitt. 4: 90. 1899. In the mountains of Colorado. 



13. Mertensia pratensis Heller, Bull. Torr. Bot. Club 26: 550. 1899. 

 Stems erect, several from a thick rootstock, 3-5 dm. high, rather equably 

 leafy: leaves thin, bright green, lanceolate, mostly acute; lower petioled, 

 5-10 cm. long; upper merely foliar bracts: inflorescence pubescent with 

 short appressed hairs, especially the margins of the linear-lanceolate acute 

 calyx-lobes: corolla blue or pink, 15-18 mm. long; the tube much surpassing 

 the calyx and about equaling the campanulate limb, which has short, broad 

 rounded lobes. (M. alba Rydb. is an albino form.) Southern Colorado and 

 New Mexico. 



14. Mertensia Bakeri Greene, Pitt. 4: 91. 1899. Softly ciliate or villous- 

 pubescent throughout, with appressed or spreading hairs, tufted on a branched 

 semiwoody caudex, 15-25 cm. high: basal leaves oblong, subacute, 3-5 cm. 

 long, on longer petioles ; stem leaves linear-lanceolate or oblanceolate, smaller, 

 sessile upward: inflorescence crowded, terminal: corolla about .15 mm. long, 

 the tube scarcely longer than the limb and twice as long as the lanceolate, 

 villous-ciliate calyx-lobes: style filiform, about equaling the corolla. Moun- 

 tains of Colorado. 



14a. Mertensia Bakeri amoena A. Nels. Less densely pubescent, the calyx- 

 lobes merely ciliate on margins: crests in corolla-throat inconspicuous. M. 

 amoena A. Nels. Bot. Gaz. 30: 95. 1900. Yellowstone Park and adjacent 

 regions. 



