^^■ATERLEAF FAMILY 703 



Terminal divisions of the leaves large and obovate in outline. 



15. I', splendens. 

 Terminal division.s of the leaves not much enlarged, ovate, lanceolate or oblong 

 in outline. IG. p. glandulosa. 



Coro]la.-l(>l)es distinctly dentate or erose. 



Corolla while; staiiiens about t\vice as long as the corolla. 17. P. alba. 



Corolla |)uri>iisli or i)ink. 



Stamenls slightly exceeding the corolla: corolla-lobes erose. 18. P. neomexicana. 

 Stamens iiicluded ; coroUa-lobes dentate. 19. P. denliculata. 



III. Ramosissimae. 

 Leaves pinnatifld or bipinnatifld. 



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



diflfusely branched. 20. P. ramosissima. 



Caly.\-lobes linear: segments of the leaves small, oblong; plant simple. 



21. P. hispida. 

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



IV. LlNE.\RES. 



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



23. P. Franklinii. 

 Leaves entire or \vith 3-5 entire divisions. 24. P. linearis. 



V. Sericeae. 

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



Stamens at least t\vice as long as tlie 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 tliroughout: segments of the leaves narrowly linear. 



27. P. sericea. 



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

 oblong. 28. P. ciliosa. 



VI. PULCHELLAE. 



Flowers almost sessile in small dense sessile spikes; calyx equaUing the corolla, or slightly 

 shorter. , 



Leaves pinnatifld; 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. Knighlii. 



Flowers pediceled in ped uncled racemes; calyx much shorter than the coroUa. 

 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. curtipes. 



Filaments glabroiis. 36. P. incana. 



Leaf-blades round, sinuately toothed or crenate. 



Corolla 8-10 mm. long; leaves glandular-puberulent. 37. P. glechomaefolia. 



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



VII. BiCOLORES. 



Corolla wliite or pale piirple, not much, if at all, exceeding the calyx. 

 Plant not glandular or scarcely so; leaves piuuatifid. 



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



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



Plant decidedly glandular; leaves more or less bipinnatifld. 



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



41. P. qlandulifera. 

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



42. P. affinis. 

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



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



Corolla narrowly funnelform, nearly tubular; leaves twice pinnatifld. 



44. P. bicolor. 



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

 slightly hirsute; basal leaves petioled, 5-15 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 — Sub- 

 viont. Je-Au. 



