3. P. grácilis, Nutt. 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. Cobæ̀a, Nutt. 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. tubiflòrus, 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. álbidus, Nutt. Viscid-pubescent, 6–10´ high; leaves oblong-lanceolate or narrow, entire or sparsely toothed; clusters of the strict thryse 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; thryse raceme-like.
7. P. grandiflòrus, Nutt. Stem 2–4° high; leaves thickish, the upper and floral rounded, all but the obovate radical ones clasping or perfoliate; pedicels short; corolla 2´ long, oblong-campanulate, nearly regular, lilac or lavender-blue; sterile filament hooked and minutely bearded at the apex.—Prairies, from Ill. and Wisc. to Dak., Neb., and Kan.
8. P. glàber, Pursh. Stems 1–2° high, leaves mostly oblong-lanceolate or the upper ovate-lanceolate; thryse elongated, the peduncles and pedicels very short; corolla 1–1½´ 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. acuminàtus, Dougl. Stems 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. MÍMULUS, L. Monkey-flower.