WATERLEAF FAMILY 793 



Terminal divisions of the leaves large and obovate in outline. 



f the leaV6S n0t mUCh enlarged ' ovate'knceffifor oblong 



Corolla-lobes distinctly 'dentate or erose 



Cor ab Ut tWlCe aS 10ng M the C0rolla ' 



Stamen^ssUghtly exceeding the corolla; corolla-lobes erose. 18 P ncomeiicr 

 Stamens included; corolla-lobes dentate. 19. p\ dcnticulaln 



III. RAMOSISSIMAE. 

 Leaves pinnatifid or bipinnatifld. 



al dfffu a b ely bSS e ed ate: segments of the leaves broad ' ob <>vate or oblong; plant 

 Calyx-lobes linear; segments of the leaves small, oblong; plant simple " 

 Leaves round-lobed and coarsely crenate. 22.' P. Ifaftani 



IV. LIXEARES. 

 Leaves pinnately divided with numerous divisions, which are often toot lied. 



Leaves entire or with 3-5 entire divisions. 24.' P'. Unearts* 



V. SERICEAE. 



Stamens only slightly exceeding the corolla. 25 P idahocnsi< 



Stamens at least twice as long as the corolla. 



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



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. 



27. P . scriccci 



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 slight Iv 



shorter. 

 Leaves pinnatifid; calyx enlarging in fruit and strongly reticulate. 



29. P. firmomnrginata. 



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 9r 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. glechornaefolia. 



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



VII. BlCOLORES. 



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. campcstris. 



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



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. 



42. P. atlinis. 

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



Corolla broadly funnelform; leaves once pinnate. 43. P. Frcmontii. 



Corolla narrowly funnelform, nearly tubular; leaves twice pinnatifid. 



44. P. bicolor. 



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

 slightly hirsute; basal leaves petioled, 5-15 cm. long, oblanceolate <>r ellipti<-: 

 calyx-lobes linear or linear-oblong, obtuse, about two-thirds as Innir as the corolla: 

 filaments vinous-bearded. Dry hills: Neb. Colo. Ida.- 

 mont. Je Au. 



