WATERLEAF FAMILY 703 



Terminal divisions of the leaves large and obovate in outline. 



Terminal divisions of the leaves not much enlarged, ovate, 'lanceolate or^blone 



in outline. 16 p alandulotn 



Corolla-lobes distinctly dentate or erose. 



Corolla white; stamens about twice as long as the corolla. 17. P alba 

 Corolla purplish or pink. 



Stamens ^lightly exceeding the corolla; corolla-lobes erose. 18. P. neomexicana 



Stamens included; corolla-lobes dentate. 19. p. denticulata. 



III. RAMOSISSIMAE. 

 Leaves pinnatifid or bipinnatifld. 



Calyx-lobes oblanceolate ; segments of the leaves broad, obovate or oblong- plant 



diffusely branched. 20. P. ramosissima. 



Calyx-lobes Imear; segments of the leaves small, oblong; plant simple. 



Leaves round-lobed and coarsely crenate. 22. P. Rattani. 



IV. LlNEARES. 



Leaves pinnately divided with numerous divisions, which are often toothed. 



23. P. Franklinii. 

 Leaves entire or with 35 entire divisions. 24. P. linearis. 



V. SERICEAE. 



Stamens only slightly exceeding the corolla. 25. P. idahoensis 



Stamens at least twice as long as the corolla. 



Leaves divided half ways to the midrib; stamens twice as long as the corolla. 



26. P. Lyallii 



Leaves divided to near the midrib; stamens about three times as long as the corolla 

 Plant equally sericeous throughout; segments of the leaves narrowly linear. 



Plant finely pubescent, hirsute-ciliate on the petioles; segments of the leaves 

 oblong. 28. P. ciliosa. 



VI. PULCHELLAE. 



Flowers almost sessile in small dense sessile spikes; calyx equalling the corolla or sliehtlv 



shorter. 

 Leaves pinnatifid; calyx enlarging in fruit and strongly reticulate. 



29. P. firmomarginata. 



Leaves merely toothed or lobed; calyx neither much accrescent nor reticulate. 

 Leaf-blades spatulate. 



Calyx-lobes subequal. 30. P. cephalotes. 



Calyx-lobes unequal, the longer twice as long as the shorter. 



31. P. minutissima. 



Leaf-blades orbicular or rounded ovate. 32. P. Knightii. 



Flowers pediceled in peduncled racemes; calyx much shorter than the corolla. 

 Leaf-blades entire or nearly so. 



Leaf-blades orbicular or subreniform. 33. P. demissa. 



Leaf-blades ovate, obovate, oval, or oblong. 



Corolla about 1 cm. long; plant diffuse. 34. P. pulchella. 



Corolla about 6 mm. long; plant erect. 



Filaments sparsely pilose. 35. P. curvipes. 



Filaments glabrous. 36. P. incana. 



Leaf-blades round, sinuately toothed or crenate. 



Corolla 8-10 mm. long; leaves glandular-puberulent. 37. P. glechomae folia* 



Corolla 3-5 mm. long; leaves hirsutulous. 38. P. rotundifolia. 



VII. BICOLORES. 



Corolla white or pale purple, not much, if at all, exceeding the calyx. 

 Plant not glandular or scarcely so; leaves pinnatifid. 



Corolla shorter than the calyx. 39. P. campestris. 



Corolla usually slightly exceeding the calyx. 40. P. Ivesiana. 



Plant decidedly glandular; leaves more or less bipinnatifid. 



Calyx-lobes linear or nearly so, twice as long as the capsule. 



41. P. glandulifera. 

 Calyx-lobes spatulate, scarcely half longer than the capsule. 



Corolla about twice as long as the calyx; throat yellow; limb purple. 



Corolla broadly funneiform; leaves once pinnate. 43. P. Fremontii. 



Corolla narrowly funneiform, nearly tubular; leaves twice pinnatifid. 



44. P. tricolor. 



1. P. leucophylla Torr. Stem 1-3 dm. high, densely canescent and only 

 slightly hirsute; basal leaves petioled, 5-15 cm. long, oblanceolate or elliptic; 

 calyx-lobes linear or linear-oblong, obtuse, about two-thirds as long as the corolla; 

 filaments villous-bearded. Dry hills: Neb. Colo. Ida. B.C. Plain Svb- 

 inont, Je Au. 



