WATERLEAF FAMILY 703 



Terminal divisions of the leaves large and obovate in outUne. 



15. P. splendens. 

 Terminal di\asions of the leaves not much enlarged, ovate, lanceolate or oblong 

 in outline. 16. P. glandulosa . 



CoroUa-lobes distinctly dentate or erose. 



Corolla white; stamens about t\vice as long as the coroUa. 17. P. alba. 



Corolla purplish or pink. 



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

 Stamens included; coroUa-lobes dentate. 19. P. denticulata. 



III. R.\MOSISSIlL\E. 



Leaves pinnatifld or bipinnatifid. 



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



diffusely branched. 20. P. ramosissima. 



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



21. P. hispida. 

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



IV. LlNE.\RES. 



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



2.3. P. Franklinii. 

 Leaves entire or with 3-5 entire divisions. 24. P. linearis. 



V. Sericeae. 



Stamens only sUghtly exceeding the coroUa. 25. P. idahoensis. 



Stamens at least twice as long as the corolla. 



Leaves divided halfways to the midrib; stamens twice as long a.s the corolla. 



26. P. Lyallii. 

 Leaves di\dded to near the midrib ; stamens about three times as long as the coroUa. 



Plant equallj' sericeous throughout; segments of the leaves narrowly linear. 



27. P. sericea. 



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

 oblong. 28. P. ciliosa. 



VI. PULCHELLAE. 



Flowers almost sessile in small dense sessile spikes; caljTC equalling the coroUa, or slightly 

 shorter. 

 Leaves ptnnatifid; calyx enlarging in fniit 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 coroUa. 

 Leaf-blades entire or nearly so. 



Leaf-blades orbicular or subreniform. 

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

 Corolla about 1 cm. long; plant diffuse. 

 Corolla about 6 mm. long; plant erect. 

 Filaments sparsely pUose. 

 FUaments glabrous. 

 Leaf-blades round, sinuately toothed or crenate. 



CoroUa 8-10 mm. long; leaves glandular-pubenilent. 

 CoroUa 3-5 mm. long; leaves hirsutulous. 



VII. BICOLORES. 



CoroUa wliite or pale purple, not much, if at aU, exceeding the calyx. 

 Plant not glandular or scarcely so; leaves pinnatifld. 



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



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



Plant decidedly glandular; leaves more or less bipinnatifid. 



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



41. P. glandulifera. 

 CaU-x-lobes spatulate, scarcely half longer than the capsule. 



42. P. affinis. 

 Corolla about twice as long as the calj-x; throat yeUow; Umb purple. 



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



Corolla narrowly furmelform, nearly tubiilar; leaves twice pinnatifld. 



44. P. bicolor. 



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

 slightly hirsute; basal leaves petioled^ 5-L5 cm. long, oblanceolate or elliptic; 

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

 filaments vUlous-bearded. Dry hills: Neb. — Colo. — Ida. — B.C. Plain — Svh- 

 niont. Je-Au. 



