778 SCROPHULARIACEAE 



flexed; lower lip erect. Stamens 4; filaments partly adnate to the corolla-tube. 

 Styles glabrous, united up to the 2-lobed stigma. Capsule locuUcidal; placentae 

 separating from the valves, remaining united in the middle, seldom separating. 



Calyx oblique, decidedly inflated in fruit; upper tooth much larger than the rest; corolla 



yellow. 

 Calyx-teeth acute; stem neither rooting at the nodes, nor floating. 



Perennials, usually tall and erect, 3-6 dm. liigh; corolla 2-3.5 cm. long; upper 



calyx-tooth half longer than the rest. ^ /i • 



Leaves glabroiis; stem pubescent only above. 1. M. Langsaorfit. 



Leaves and stem pubescent throughout. 2. M. puberulus. 



Annuals, slender or low; corolla 2 cm. or less long. 



Corolla 1.5-2 cm. long, at least twice as long as the calyx. 



Stem long, usually slender; upper calyx-lobe about twice as long as the 



rest; calyx red-spotted. 3. M. jiasutus. 



Stem less than 1 dm. laigh; upper calyx-lobe only slightly longer than the 

 rest; calyx not spotted. 4. M. thermalis. 



. Corolla 5-10 mm. long, about half longer than the calyx. 



Plant perfectly glabrous. 5. M. Hallu. 



Inflorescence and calyx villous-puborulent. 6. M. microphyllus. 



Calyx-teeth obtuse; stem decumbent or floatmg, rooting at the nodes. 



7. M. Geyeri. 



Calyx neither oblique, nor inflated; its lobes nearly equal. 

 Perennials; flowers 1.5-4 cm. long; sepals linear-lanceolate. 



Corolla crimson or rose. . .. 



TaU, with erect stem, 3-10 dm. high, not stoloniferous. 8. M. Lewisxi. 

 Stem 1-2 dm. high, stoloniferous. 9. M. Eastwoodiae. 



Corolla yellow; plant low or slender, weak. , , 



Stem leafy throughout. 10. M, moschatus- 



Stem leafy only at the base. 15. M, pnmulotdes. 



Annuals; flowers 0.5-2 cm. long; sepals ovate, triangular, or broadly lanceolate. 

 Leaves petioled; blades cordate to ovate-lanceolate. 



Leaf-blades cordate or broadly ovate, indistinctly 5-ribbed. , . 



Corona 1.5-2 cm. long. 11. M. peduncularis. 



Corolla 1 cm. or less long. » 



Leaves not very thin, dark green, decidedly pubescent; stem oiten 



purple and villous. 12. M. floribiindus. 



Leaves very thin, membranous, hght green, glabrous or nearly so; stem 



very deUcate, white. 13. M. membranaceus. 



Leaf-blades ovate-lanceolate, tapering at the base, distinctly 3-ribbed. 



14. M. breviflorus. 



Leaves sessile, oval, oblong, lanceolate or linear. 



Corolla yellow; lower hp lobed. , 



Leaves basal or nearly so; peduncle solitary, scape-like, many times longei 



than the leaves. 15. M. primulotdes. 



Leaves scattered; peduncles axillary, scarcely exceeding the leaves. 



Plant villous, 1-4 dm. high; lower Up of the corolla with 2 brown spots. 



16. M. pilosus. 

 Plant 1 dm. high or less, glabrous or gland ular-puberulent; coroua 



spotless. 



Leaves thick, indistinctly veined; corolla 4-6 mm. long. 



17. M. Suksdorfii. 



Leaves thin, more or less distinctly 3-ribbed; corolla ab9ut 8 mm. 

 long. 18. Af. grattoloides. 



Corolla rose-colored; lower lip entire. , „ 



Plant glandular-puberulent. 19. M. rubellus- 



Plant glandular-vUlous. 20. M. Breweru 



1. M. Langsdorfii Donn. Stems erect or ascending, 1-10 dm. high, glabrous; 

 lower leaves i^etioled, the upper sessile or clasping; blades ovate, rounded^ or 

 subreniform, sinuately dentate or denticulate, 2-7 cm. long, glabrous; calyx lO-lo 

 mm. long, puberulent; teeth broadly triangular-ovate, acutish; corolla 2-3.5 cm. 

 long, yellow, rarely spotted, bearded inside. iW. luleus A. Gray, not L. M- 

 minor A. Nels. Swamps and along streams: Sask. — N.M. — Calif. — Alaska, 

 Mex. Suhmont. — Siibalp. Ap-Au. 



2. M. puberulus Greene. Stem 2-3 dm. high, viscid-hirtellous; lower 

 leaves petioled, obovate or spatulate, somewhat pubi^rulent; upper stem-leaves 

 sessile, ovate, coarsely dentate; calyx viscid-puberulent, about 1 cm. long; teetn 

 triangular, acute; corolla yellow, 2-2.5 cm. long, funnelform. Mountains: Colo. 

 Mont, Je-Jl. 



3. M. nasutus Greene. Stem glabrous or minutely puberulent, 1-5 dm. 

 high, 4-angled; lower leaves spatulate, petioled, the upper rounded or reniform, 

 clasping; calyx 6-8 mm. long, puberiilent; teeth triangular, very acute; corolla 



