440 



SCROPHULARIACEAE (FIGWORT FAMILY) 



Leaves oblong to narrowly lanceolate. 

 Stems strict and slender. 



Anthers comose . . . . . . . 5. P. strictus. 



Anthers short-hirsute . . w . . . 6. P. utahensis. 



Stems ascending-erect, stout. 



Few-flowered; mostly low and dwarf . . . 7. P. alpinus. 



Many-flowered; taller 8. P. glaber. 



Leaves oblong to ovate or subcordate . . . . 9. P. cyananthus. 



Plant pruinose-puberulent. 



Conspicuously so 10. P, Fremontii. 



Obscurely so. 



Stems slender, strict 11. P. comarrhenus, 



Stems stout, decumbent 7 P. alpinus. 



Anther-cells confluent, being dehiscent from the base through their 



junction at the apex. 

 Plant glabrous throughout. 



Distinctly suffrutescent at base. 



Anthers comose ; . . . . . . . . 12. P. fruticosus. 



Anthers glabrous 13. P. deustus. 



Herbaceous to the ground (or nearly so). 

 Upper stem leaves oblong to linear. 



Plant tall, 3-12 dm. high 14. P. unilateralis. 



Plant low, mostly less than 3 dm. high. 



Floral leaves enlarged . . . . . . . 15. P. Haydenii. 



Floral leaves reduced. 



Leaves nearly or quite linear. 

 Corolla naked in the throat. 



Lilac or purple (high mountains) . . . 16. P. Hallii. 



Blue (plains and hills) 17. P. angustifolius. 



Corolla bearded in the throat. 

 Stems tufted, simple. 



Flowers purple 18. P. laricifolius. 



Flowers white 19. P. exilifolius. 



Stems branched ...... 20. P. ambiguus. 



Leaves narrowly oblong or oblanceolate . . . 21. P. arenicola. 

 Upper stem leaves ovate or broader. 



The uppermost narrowly ovate, acuminate . . .22. P. secundiflorus. 

 The uppermost suborbicular. 



Stems 4-10 dm. high; corolla 4-6 cm. long . , . 23. P. grandiflorus. 

 Stems 1-4 dm. high; corolla 2-3 cm. long . . . 24. P. acuminatus. 

 Plant more or less pubescent or glandular (at least in the inflores- 

 cence). 

 Stems and leaves glabrous. 



Inflorescence distinctly yerticillate-capitate. 



Sepals green or purplish, at most scarious-margined. 



Flowers small, crowded in the verticils . . . . 25. P. procerus. 



Flowers larger, verticils few-flowered .... 26. P. Owenii. 



Sepals lacerate-scarious, with green midrib . . . 27. P. Rydbergii. 

 Inflorescence thyrsoid, either paniculate or glomerate in the 



axils. 

 Thyrsus open ......... 28. P. Watsonii. 



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 caespitosely and slen- 

 derly many-branched. 

 Leaves linear or nearly so. 



Caudex depressed-caespitose 32. 



Caudex woody, more open ...... 33. 



Leaves narrowly oblong to orbicular. 



Densely pruinose-pubescent 34. 



Glabrate. 



Sepals glabrate 35. 



Sepals glandular-villous 36. 



Taller, rarely tufted (No. 39). 

 Leaves glabrous. 



Corolla blue (about 12 mm. long) 

 Corolla lilac-purple or white, lo 

 Leaves not glabrous. 



Pruinose-puberulent, obscurely if at all glandular. 



Corolla nearly tubular ...... 39. P. radicosus. 



Corolla abruptly and widely dilated. 



Leaves ovate to narrowly oblong . . . . 40. P. Jamesii. 



Leaves oblong to linear . . . . . . 41. P. similis. 



Puberulent and (above) glandular-hirsute. 

 Sterile filament comose-bearded. 



Leaves strongly serrate ...... 42. P. montanus. 



Leaves nearly entire . . , . . 43. P. erianthera. 



rliite, longer 



P. humilis. 

 P. brevifolius 

 P. glaucus. 



P. caespitosus. 

 P. linarioides. 



P. suffrutescens 



P. Crandallii. 

 P. Harbourii. 



P. collinus. 

 P. gracilis. 



