164 



Stem pubescent with gland-tipped 

 hairs. 

 Filaments much exceeding the lobes of the corolla. 

 Bracts linear, abruptly reduced from the lanceo- 

 late foliage-leaves. Plants 6-10 dm. tall. 

 Perennial. 

 Flowers all in axillary small-bracted racemes. Leaves 

 opposite throughout. Perennials. 

 Stem, pedicels, leaves and sepals pubescent. Cap- 

 sules pubescent. Leaves oval or ovate, 

 serrate to dentate. Plants of dry soil. 

 Leaves sessile or nearly so, ovate, dentate, the 

 largest cordate at base. Sepals 4-5 mm. 

 long, linear-lanceolate, exceeding the 

 capsule. Capsule not glandular, its 

 lobes broadly rounded. Ascending or 

 erect. 

 Stem erect, 3-5 dm. tall. Leaves coarsely 

 dentate. Racemes 30-60 flowered, the 

 pedicels scarcely exceeding the bracts. 

 Largest corolla-lobes ovate, 6 mm. long, 

 violet. 

 Stem ascending, 1-3 dm. tall. Leaves 

 crenately dentate. Racemes 10-20 

 flowered, the pedicels much exceeding 

 their bracts. Largest corolla-lobes 

 nearly orbicular, 3.5-4 mm. long, violet- 

 blue. 

 Leaves oval, crenate-serrate, narrowed to a 

 petiolar base. Sepals 2-3 mm. lohg, lanceo- 

 late, shorter than the capsule. Capsule 

 glandular, the most distal point being near 

 the lateral margin of each lobe. Exten- 

 sively repent, at apex ascending. 

 Stem, pedicels, leaves and cepals glabrous (or in 

 V. glandifera slightly pubescent with gland- 

 tipped hairs). Capsules glabrous. Leaves 

 oblong-ovate to linear, obscurely crenate- 

 serrate to entire. Aquatics. 

 Capsule scarcely or not wider than long, and 

 scarcely or not two-Iobed. Sepals equal- 

 ing the capsule. Leaves oblong-ovate to 

 broadly lanceolate, obscurely crenate- 

 serrate. 

 Leaves all petioled. ' Racemes usually 10- 



25 flowered. Plant emersed. 

 Leaves sessile and clasping (or only the 

 upper or lowermost petioled). Ra- 



Ta. V. peregrina xalapensis. 



8. V. longifolia. 



9. V. Tencrium. 



10. V. Chamaedrys. 



11. V. officinalis. 



12. V. americana. 



