220 The Ohio Journal of Scietice [Vol. XXI, No. 7, 



11. Corolla 2-cleft, the middle lobe of the lower lip conduplicate, enclosing the 



stamens and filiform style; odd sterile stamen gland-like Collinsia 



11. Lower lip of the corolla not enclosing the stamens and style; the fifth 



stamen not gland-like, either a long filament or a scale 12 



12. Fifth or sterile stamen reduced to a scale on the upper lip of the inflated 



corolla; stem 4-angled Scrophularia 



12. Fifth or sterile stamen a filament, prominently bearded or glabrous; stem 



cylindrical or only slightly 4-sided 13 



13. Corolla somewhat 2-lipped, the upper lip 2-lobed, not arched or keeled; 



sterile stamen nearly as long, or sometimes longer than the fertile ones, 

 frequently prominently bearded; inflorescence thyrses, panicles, or 

 racemes, sometimes spike-like at the tip Penstemon 



13. Corolla decidedly 2-lipped, the upper lip arched, keeled in the middle and 



notched at the apex; sterile stamen shorter than the fertile ones; fiowers 

 in terminal and axillary dense spikes Chelone 



14. Calyx prismatic; leaves opposite; stem square; flowers axillary. . . .Mimulus 



14. Calyx not prismatic 15 



15. Leaves alternate; flowers in one-sided racemes Digitalis 



15. Leaves, at least the lowest, opposite 16 



16. Sepals free nearly to the base, linear; upper lip of the corolla covering the 



lower in the bud, emarginate or 2-lobed; stamens included; annual, 

 diffusely branched, pubescent herbs, with pinna tely-par ted leaves. .Conobea 



16. Calyx with a considerable tube, campanulate or turbinate 17 



17. Corolla salver-form, purple; flowers in a long, peduncled spike. . . .-. .Buchnera 

 17. ' Corolla campanulate or funnel-form; flowers not in a long, peduncled spike . . 18 



18. Filaments glabrous or nearly so; leaves all, or some of them, auricled at 



the base; stamens didynamous, the anthers of the shorter stamens 

 smaller Otophylla 



18. Filaments wholly, or in part, pubescent or villous: leaves not auricled.. . . 19 



19. Stamens nearly equal; calyx lobes as long as the tube; corolla yellow; 



lower leaves long-petioled and pinnately-parted Afzelia 



19. Stamens unequal, strongly didynamous; calyx teeth shorter than the tube. .20 



20. Anthers awned at the base; corolla yellow; leaves parted, lobed, or toothed, 



or if the upper are entire, then lanceolate or ovate-lanceolate. . . .Dasystotna 



20. Anthers awnless; corolla purple, pink, or rarely white or yellowish; leaves 



narrowly linear or linear-lanceolate Agalinis 



21. Leaves opposite, entire; ovules 2-4 Melampyrum 



21. Leaves alternate, or if opposite or whorled, then compound or lobed; 



ovules numerous 22 



22. Anther-sacs dissimilar, the inner one pendulous by its apex; floral bracts 



brightly colored; leaves parallel-veined Castilleja 



22. Anther-sacs similar and parallel; bracts of the inflorescence not brightly 



colored; leaves pinnately-veined Pedicularis 



23. Corolla strongly 2-lipped, large and showy, the lower lip sack-sliaped and 



broad; cultivated; sepals 5 or frecjuently the two lower more or less 

 united Calceolaria 



23. Corolla nearly regular, or if 2-lipped, the lips not sack-like 24 



24. Corolla 2-3 lobed or none; leaves alternate; flowers in dense, terminal, 



elongated spikes or racemes Synthyris 



24. Corolla 4-5 lobed; at least the lower leaves opposite or whorled 25 



25. Calyx 4-lobed, rarely 5-lobed, the under lip or lobes of the corolla enfolding 



the upper in the bud ; flowers solitary in the axils or in racemes or spike- 

 Hke 26 



25. Calyx 5-lobed; upper lip of the corolla covering the lower in the bud 27 



26. Corolla tubular or salver-form, much longer than the calyx; stamens much 



exserted, nearly parallel; leaves opposite or verticillate, or both; tall 

 herbs, 2-7 ft. high Leptandra 



26. Corolla wheel-shaped, tube short; leaves usually opposite below and 



alternate above; stamens divergent; low or spreading herbs, 3-30 in. 



Veronica 



27. Peduncles 2-bracteate at the summit; flowers yellow or whitish Graliola 



27. Peduncles not bracteate at the summit; flowers purplish Ilysanthes 



