382 SCROPHULARIACEiE. (p^IGWORT FAMILY.) 



lanceolate with subcordate clasping base (2 -5' long); thyrse broader; corolla 

 white (commonly tinged with ^xxv^Ae), abruptly and broadly inflated, the throat 

 widely open; sterile Jiloment thinly bearded above. — Moist or rich soil, Penn. 

 to Fla. and westward, where the common form is 



Var. Digitalis, Gray. Stem sometimes 5° high ; corolla larger and more 

 abruptly inflated, white. (P. Digitalis, Nutt.) — Penn. to Iowa, Mo., Ark., etc. 



3. P. gracilis, Xutt. Glabrous or puberulent, viscid-pubescent above, 

 1° high or less; stem-leaves mostly linear-lanceolate, the radical spatulate or 

 oblong; corolla tubular-funnel-form or nearly cylindrical with open throat, 

 lilac-purple or whitish. — Minn, to Mo., and westward. 



-^ ■*- Thyrse raceme-like. All extreme western. 



4. P. Cobdea, Xutt. Soft-puberulent, 1° high; leaves ovate or oblong, or 

 the lower broadly lanceolate and the upper cordate-clasping, mostly sharply 

 toothed ; thyrse short ; corolla 2' long, broadly ventricose, dull purple or whitish. 

 — Prairies, Kan. to Tex. 



5. P. tubiflorus, Nutt. Wholly glabrous excepting the viscid ovate 

 sepals, 2-3° high; leaves oblong or ovate-lanceolate, entire or sparsely toothed, 

 the floral shorter than the remote dense clusters of the virgate thyrse ; 

 corolla 9" long, the narrow tube gradually dilated upward, white or whitish. — 

 Low prairies, Kan. and Ark. 



6. P. albidus, Xutt. Viscid-pubescent, 6-10' high; leaves oblong-lan- 

 ceolate or narrow, entire or sparsely toothed ; clusters of the strict thyrse few- 

 flowered, approximate; sepals lanceolate, densely pubescent; corolla 9" long, 

 with shorter tube and more dilated throat. — Plains, Neb. to Dak. and Tex. 



* * Glabrous throughout and glaucous ; leaves sessile, entire ; thyrse raceme-like. 



7. P. grandiflorus, Nutt. Stem 2-4° high ; leaves thickish, the upper 

 and floral rounded, all but the obovate radical ones clasping or perfoliate ; pedi- 

 cels short ; corolla 2' long, oblong-campanulate, nearly regular, lilac or lavender- 

 blue ; sterile filament hooked and minutely bearded at the apex. — Prairies, 

 from 111. and Wise, to Dak., Neb., and Kan. 



8. P. glaber, Pursh. Stems 1-2° high; leaves mostly oblong-lanceolate 

 or the upper ovate-lanceolate ; thyrse elongated, the peduncles and pedicels very 

 short; corolla 1 -lY long, bright blue to violet-purple, dilated above ; anthers 

 and apex of sterile filament glabrous or sparsely hirsute. — Plains of E. Neb. 

 to Dak., and westward. 



9. P. acuminatus, Dougl. Stem 6-20' high, stout; leaves thick, the 

 lower obovate or oblong, the upper lanceolate to broadly ovate or cordate-clasping, 

 acute or acuminate ; thyrse leafy below, very narrow ; corolla 9" long, lilac or 

 violet ; sterile filament mostly bearded above. — Kan. to Minn., and westward. 



8. M I M U L U S, L. Monkey-flower. 



Calyx prismatic, 5-angled, 5-toothed, the upper tooth largest. Corolla tubu- 

 lar ; upper lip erect or reflexed-spreading, 2-lobed ; the lower spreading, 3- 

 lobed. Stamens 4. Stigma 2-lobed, the lobes ovate. Seeds numerous. — 

 Herbs, with- opposite leaves, and mostly handsome flowers on solitary axillary 

 and bractless peduncles. (Diminutive of mimus, a buffoon, from the grinning 

 corolla.) 



