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 loculicidal; 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, 36 dm. high; corolla 2-3.5 cm. long; upper 



calyx-tooth half longer than the rest. 



Leaves glabrous; stem pubescent only above. 1. M. Langsdorfii. 



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. nasutus. 



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



rest; calyx not spotted. 4. M. ther mails. 



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



Plant perfectly glabrous. 5. M. Hallii. 



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



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



7. M, Geueri. 



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

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

 Corolla crimson or rose. 



Tall, with erect stem, 3-10 dm. high, not stoloniferous. 8. M. Lewisii. 

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



Corolla yellow: plant low or slender, weak. 



Stem leafy throughout. 10. Af. moschatus. 



Stem leafy only at the base. 15. M. primuloides. 



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. 



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



Corolla 1 cm. or less long. 



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



purple and yillous. 12. M. floribundus. 



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

 very delicate, white. 13. A/, membranaceus. 



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



14. At. breviflorus. 



Leaves sessile, oval, oblong, lanceolate or linear. 

 Corolla yellow; lower lip lobed. 



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



than the leaves. 15. M. primuloides. 



Leaves scattered; peduncles axillary, scarcely exceeding the leaves. 



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



16. M. pilosus. 

 Plant 1 dm. high or less, glabrous or glandular- puberulent ; corolla 



spotless. 

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



17. M. Suksdorfii. 

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



long. 18. M. gratioloides. 

 Corolla rose-colored; lower lip entire. 



Plant glandular-puberulenfc. 19. M. rubellus. 



Plant glandular- villous. 20. M. Breweri. 



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

 lower leaves petioled, the upper sessile or clasping; blades ovate, rounded, or 

 subreniform, sinuately dentate or denticulate, 2-7 cm. long, glabrous; calyx 10-15 

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

 long, yellow, rarely spotted, bearded inside. M. luteus A. Gray, not L. M. 

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

 Mex. Submont. Subalp. Ap-Au. 



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

 leaves petioled, obovate or spatulate, somewhat puberulent; upper stem-leaves 

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

 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, puberulent; teeth triangular, very acute; corolla 



