108. SCROPHULARIACEAE 197 



12. Corolla whitish or yellow; calyx (in our species) subtended 



by a pair of sepal-like bracts; sterile filaments simple, 



included or lacking H. Gratiola 



11. Calyx usually 4-parted; stamens 2, both fertile. 



13. Leaves mostly in whorls of 3-6, rarely opposite: corolla 



tubular-funnelforni 1 7. Veronicastrum 



13. Leaves opposite or alternate. 



14. Leaves, at least the lower, opposite; corolla rotate, 4- 



lobed, blue or white 15. Veronica 



14. Leaves alternate, mostly basal; in our species the corolla 

 2-lipped, and the greenish-yellow flowers in a ter- 

 minal spike; basal leaves ovate 19. Synthyris 



10. Stamens 4, all fertile. 



15. Stamens not enclosed in the upper lip of the corolla. 

 16. Corolla distinctly bilabiate. 



17. Calyx 5-angled, 5-toothed; leaves serrate 12. Mimulus 



17. Calyx 5-parted, not angled. 



18. Leaves entire (in our species) 13. Bacopa 



18. Leaves not entire. 



19. Leaves pinnatifid; sepals distinct or nearly so, 



linear 14. Leucospora 



19. Leaves toothed or incised. 



20. Flowers 7 mm long, blue 15. Mazus 



20. Flowers 10 mm long, white with purple lines 



16. Mecardonia 



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

 21. Corolla somewhat campanulate or rotate; anthers 2- 

 loculed. 

 22. Anthers pubescent; style slender. 



23. Corolla yellow; capsule acute or acuminate; 

 leaves petioled, pinnatifid (in our species) ; 

 plants parasitic on the roots of oak trees 



20. Aureolaria 



23. Corolla purple, pink, or white; capsule obtuse, 

 mucronate; leaves sessile, linear to filiform or 



lanceolate 21 . Gerardia 



22. Anthers glabrous; style short; corolla yellow; leaves 

 mostly pinnatifid. the upper alternate, lanceolate 



22. Dasistoma 



21. Corolla salverform; anthers 1-loculed; flowers in an 



elongated sjjike 23. Buchnera 



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



24. .'\nther-sacs dissimilar, unequal; leaves alternate, cleft or 



lobed (in our species) 24. Castilleja 



24. Anther-sacs alike, parallel. 



25. Leaves pinnately lobed and crenate 25. Pedicularis 



25. Leaves entire; floral bracts toothed 26. Melampyrum 



1. Verbascum L. — Mullein 

 1. Plants densely tomentose with stellate hairs; flowers yellow, in a 

 dense spike; leaves decurrent. 

 2. Flowers L5-2 cm in diameter; leaves strongly decurrent; stem 



