690 SCROPHULARIACEAE 



Stem and leaves glandular-pubescent or -puberulent; leaf-blades oblanceolate or narrowly so, 3- 

 veined. 

 Orifice of calyx eciliate, its teeth 1-2 mm. long. 



Calyx-teeth equal, subulate-tipped, its tube with thickened ribs. 



Corolla yellow, with upper lobes usually white; stem closely glandular-pubescent. 



14. M. bicolor. 



Corolla purple, the lower lip less hairy; stem more loosely glandular-pubescent. 



15. M.Biolettii. 



Calyx-teeth unequal, acute or acutish, the uppermost longest, calyx-tube with thin ribs. 



16. M. filicaiilis. 

 Orifice of calyx ciliate, its teeth 0.5-1 mm. long. 



Corolla yellow or somewhat purplish, unmarked, the throat gradually expanding distally 

 and the lobes rounded or truncate; pedicels two to two and a half times length of 

 calyx, at maturity deflexed-spreading. 17. M- discolor. 



Corolla purple, with yellow ventral ridges, the lobes notched; pedicels two and a half to 

 three and a half times length of calyx, more ascending-spreading. 



18. M. Palmeri. 



Anthers glabrous. 



Calyx-lobes triangular-acute to -acuminate (or the ventral rounded in M. alsinoides) . 



Leaf-blades petioled (or upper subsessile to sessile in M. arenarius and M. breviftorus); 

 corolla yellow. 

 Corolla at least twice as long as calyx; style over two-thirds the capsule-length. 



Lower lip slightly longer than but not much deflexed from upper lip of corolla; leaf- 

 blades longer than their petioles. 

 Stem and usually leaves strongly pubescent; leaf-blades acute, the cauline rounded 

 to cordate at base; plant over 1 dm. tall. 

 Throat of corolla cylindric, the ventral ridges narrow; pedicels not over one 

 and one-half times the length of the bracts. 

 Lobes of calyx triangular-subulate, one-fourth the length of tube; corolla 

 10-18 mm. long; stem villous with glandless hairs. 



19. M. subulatus. 



Lobes of calyx triangular-acute to -acuminate, less than one-fourth the 

 length of tube. 

 Corolla 15-20 mm. long, its throat more than twice width of basal 

 tube; pedicels 20-30 mm. long; stem villous with glandless 

 hairs. 20. M. Dudley*. 



Corolla less than 15 mm. long, its throat little wider than the basal 

 tube; pedicels 10-20 mm. long; stem villous with glandless 

 or largely gland-tipped hairs. 

 Leaf-blades ovate, dentate or denticulate (except in dwarfs); 

 corolla 5-12 mm. long. 



21. M. floribundus. 



Leaf-blades lance-ovate, entire to slightly denticulate; corolla 

 10-13 mm. long; racemes narrower and more elongated. 



22. M. multiflorus. 



Throat of corolla somewhat flattened, the ventral ridges so wide and promi- 

 nent as to separate three deep channels that are richer yellow and 

 coarsely spotted or blotched; pedicels one and one-half times to twice 

 the length of the bracts. 23. M. trisulcatus. 



Stem and leaves glandular-puberulent or finely glandular-pubescent; cauline leaf- 

 blades narrowed at base; plant 0.5-1.5 dm. tall. 

 Leaf blades acute or acutish, dentate or denticulate; stem finely pilose. 



Corolla 20-22 mm. long; calyx-lobes acuminate; leaf -blades coarsely 

 toothed; stem glandular-pubescent. 



24. M. Whipplei. 



Corolla 13-17 mm. long; calyx-lobes acute; leaf -blades finely dentate or 

 denticulate; stem finely pilose. 25. M. arenarius. 



Leaf -blades obtuse or obtusish, denticulate to entire, the cauline well-petioled; 

 corolla 9-14 mm. long; stem glandular-puberulent. 



26. M. Pulsiferae. 



Lower lip deflexed from and longer than upper lip of corolla; leaf-blades ovate, 

 palmately veined, shorter than or mostly about the length of their petioles. 

 Calyx-teeth uniform, acute or acutish; corolla not blotched, the palate of the 

 lower lip pubescent; leaf-blades acute to obtuse. 

 Style glandular-pubescent; corolla 12-15 mm. long; calyx becoming 6-8 

 mm. long. 27. M. washingtonensis. 



Style glabrous; corolla 7-9 mm. long; calyx becoming 5-6 mm. long. 



28. M. patulus. 



Calyx-teeth unlike, the upper 3 acute, the 2 lower longer and rounded; corolla 

 8-11 mm. long, the lower lip glabrous and with median brown blotch; 

 leaf-blades obtuse or rounded. 29. M. alsinoides. 



Corolla less than twice as long as the calyx; style one-half to two-thirds as long as the 

 capsule; leaf-blades elliptic-lanceolate, palmately veined, narrowed at base. 



30. M. breviftorus. 



Leaf-blades (except lowermost in M. latidens) sessile by rounded bases; corolla purplish or 

 white; root-system relatively strongly developed. 

 Plant sparsely glandular-puberulent, with several to many slender stems 1.5-2.5 dm. 

 tall; leaf-blades ovate, the upper pairs (bracts) remote and much smaller; calyx 

 10^12 mm. long, in fruit contracted distally. 31. M. latidens. 



Plant hirsute, the single stout stem 1 . 5-6 dm. tall ; leaf-blades numerous, oblanceolate to 

 oblong, the upper little smaller; calyx 9-10 mm. long, in fruit not contracted 

 distally. 32. M. Parishii. 



Calyx-lobes rounded, either bluntly so or mucronate; leaf-blades sessile; plant glandular-puberulent. 

 Stigmas not fringed; basal tube of corolla little or not surpassing the calyx. 



Pedicels 5-20 mm. long, less than twice length of bracts, eventually deflexed-spreading; 

 anthers and stigmas included; leaf-blades oblong-lanceolate, obtuse, entire, 3-veined 

 from narrow base. 



