226 American Midland Naturalist Monograph No. 2 



8. Calyx 5-parted; two stamens anther-beaiing, and two sterile, or the latter 

 sometimes absent. 

 9. Corolla purplish; calyx without bracts; sterile filaments 2-forked, slightly 

 exserted 7. Lindernia 



9. Corolla whitish oi yellow; calyx (in our species) subtended by a pair 



of sepal-like bracts; sterile filaments simple, included or lacking 



8. Cratiola 



8. Calyx 4-parted; stamens 2, both fertile. 



10. Leaves mostly in whorls of 3-6, rarely opposite; corolla tubular-funnel- 



form 13. Veronicaslrum 



10. Leaves opposite or alternate. 



1 1 . Leaves, at least the lower, opposite; corolla rotate, 4-lobed, blue or 



white 14. Veronica 



I 1 . Leaves alternate, mostly basal; in our species the corolla 2-lipped, 

 and the flowers greenish yellow, in a terminal spike; basal leaves 



ovate 1 5. Svnthvris 



7. Stamens 4, all fertile. 



12. Stamens not inclosed in the upper lip of the corolla. 

 13. Corolla distinctly bilabiate. 



14. Calyx 5-angled, 5-toothed; leaves serrate 9. Mimulus 



14. Calyx 5-parted, not angled. 



15. Leaves entire (in our species) 10. Dacopa 



15. Leaves not entire. 



16. Leaves pinnatifid; sepals distinct or nearly so, linear 



1 1. Leucospora 



16. Leaves toothed or incised; calyx campanulate, 5-lobed.... 



12. Mazus 



13. Corolla with a spreading, slightly unequally 5-lobed limb. 



17. Corolla somewhat campanulate or rotate; anthers 2-loculed. 

 18. Anthers pubescent; style slender. 



19. Corolla yellow; capsule acute or acuminate; leaves 

 petioled, pinnatifid (in our species) ; plants parasitic 



on the roots of oak trees 16. Aiireolaria 



19. Corolla purple, pink, or white; capsule obtuse, mucronate; 



leaves sessile, linear to filiform 17. Cerardia 



18. Anthers glabrous; style short; corolla yellow; leaves mostly 



pinnatifid, the upper alternate, lanceolate 18. Dasisioma 



17. Corolla salverform; anthers 1-lcculed; flowers in an elongated 



spike 19. Biichnera 



12. Stamens included in the upper lip of the corolla. 



20. Anther-sacs dissimilar, unequal ; leaves alternate, cleft or lobed (in our 



species) 20. Caslilleja 



20. Anther-sacs alike, parallel. 



21. Leaves pinnately lobed and crenate; floral bracts not spinulose- 



toothed 2 1 . Pedicularis 



21. Leaves entire; floral bracts spinulose-toothed 22. Mclampvriim 



1. Vf.RBASCUM L. — Mullein 



L Plants densely tomentose; flowers in a dense spike; leaves strongly decurrent; 

 fields, roadsides, waste places, common; nat. from Eur. June-Aug. Com- 

 mon Mullein V. thapsus L. 



L Plants glabrous below, glandular above; flowers racemose; corolla white or 

 yellow; roadsides and pastures, common; nat. from Eur. June-Aug. Moth 

 Mullein V. blattaria L. 



2. Chelone L. — Turtlehead 



L Corolla white or tinged with pink; sepals obscurely ciliolate; sterile filament 



