440 



SCROPHULARIACEAE (FIGWORT FAMILY) 



I their 



12. 



"Leaves oblong to narrowly lanceolate. 

 Stems strict and slender. 



Anthers comose 



Anthers short-hirsute . . ,. , 

 Stems ascending-erect, stout. 



Few-flowered; mostly low and dwarf 

 Many-flowered; taller .... 

 Leaves oblong to ovate or subcordate , 

 Plant pruinose-puberulent. 



Conspicuously so 



Obscurely so. 



Stems slender, strict . , . , , ; 



Stems stout, decumbent . . , . . 

 Anther-cells confluent, being* diehiscent from the baise through 

 junction at the apex. " ' 



Plant glabrous throughout. 



Distinctly suffrutescent at base. 



Anthers comose . . , ., ) * 



Anthers glabrous . . . , ' , , , , ,13, 

 Herbaceous to the ground (or nearly so). 

 Upper stem leaves oblong to linear. 



Plant tall, 3-12 dm. high 14. 



Plant low, mostly less than 3 dm. high. 



Floral leaves enlarged ....... 15. 



Floral leaves reduced. . > 



Leaves nearly orqulte, linear. , , ,j 



Corolla naked in the throat. 



Lilac or purple (high mountains) . , . 16. 



Blue (plains and hills) . . , , .17. 



Corolla bearded in the throat. 

 Stems tufted, simple. 



Flowers purple. 18. 



Flowers white 19. 



Stems branched 20. 



Leaves narrowly oblong or oblanceolate , , . 21. 

 Upper stem leaves ovate or broader. , , , 



The uppermost narrowly ovate, acuminate . . r , 



' The uppermost suborbiciilar. ' ' 



Stems 4-10 dm. high; corolla 4r-6 cm. long 

 Stems 1-4 dm. high; corolla 2-3 cm. long . . . 

 Plant more or less pubescent or glanduliaF (at least' in the inflbres- 

 cence). - ' 



Stems and leaves glabrous. 



Inflorescence distinctly" verticillate-capitate. ' 



Sepals green or purplish, at most scarious-margined. 

 Flowers small, crowded in the verticils , , 

 Flowers larger, verticils few-flowered . 

 Sepals lacerate-scarious, with green midrib 

 Inflorescence thyrsoid, either paniculate or glomerate in the 

 axils. 

 Thyrsus open ......... 



Thyrsus crowded, strict, flowers small. 



Basal leaves mostly oblanceolate . , , . * , 29. 

 Basal leaves oval or rotund . ■ . . ■ , , . 30. 



Thyrsus of crowded axillary glomerules, flowers large . 31. 



Stems (at least) and the inflorescence puberulent or more pubescent. 

 Low (2 dm. or less), the persistent base caespitos^y and slen- 

 derly many-branched. 

 Leaves linear or nearly so. 



Caudex depressed-caespltose , . 



Caiidex woody, niore open .... 



Leaves narrowly oblong to orbicular. 

 > Densely pruinose-pubescent . 

 Glabrate. 



Sepals glabrate 



' Sepals glandular-villbus 

 Taller, rarely tufted (No. 39). 

 Leaves glabrous. 

 Corolla blue (about 12 mm. lone) . . . 

 Corolla lilac-purple or white, longer 

 Leaves not glabrous. 



Pruinose-puberulent, obscurely if at all glandular. 

 Corolla nearly tubular .... 



Corolla abruptly and widely dilated. 

 Leaves ovate to narrowly oblong 

 Leaves oblong to linear .... 

 Puberulent and (above) glandular-hirpute. 

 Sterile filament comose-bearded. 



Leaves strongly serrate , , . . 

 Leaves nearly entire .... 



P. strictus. 

 P. utahensis. 



P. alpinus. 



P. glaber. 



P, cyananthus. 



P, Fremontii. 



P. comarrhenus, 

 P. alpinus. 



P. fruticosus. 

 P. deustus. 



P. unilateralis. 

 P. Haydenii. 



P. Hallii. 



P. angustifolius. 



"P,. larici^Hus. 

 P. exilifolius. 

 P. ambiguus. 

 P; arenicola. 



22. P. secundiflorus. 



P. grandiflorus. 

 P. acuminatus. 



P. procerus. 

 P. Owenii. 

 P. Rydbergii, 



28. P. Watsonii. 



P. humilis. 

 P. brevifoliuB. 

 P. glaucus. 



P. caespitosus. 

 P. linarioides. 



34, P. suff'rutescens 



35. 



36. 



37. 

 38. 



P. Crandallii. 

 P. Harbourii. 



P. collinus. 

 P. gracilis. 



39, P. radicbsus. 



40. 

 41. 



42. 



43. 



P. Jamesii. 

 P. similis. 



P. montanus. 

 P. erianthera. 



