8(1). Corolla throat open; flowers axillary or several in a lax terminal raceme 

 (9) 



8. Corolla throat partly or nearly closed by the prominent palate; flowers mostly 



numerous in a definite raceme (11) 



9(8). Annual; stems usually erect; leaves oblong-lanceolate; calyx deeply cleft, 

 the upper tooth about equaling the tube; herbage viscid-villous with 

 long white hairs 8. M. pilosus. 



9. Perennials; stems low, creeping or procumbent; leaves ovate to suborbicular; 



calyx shallowly cleft, the teeth all much shorter than the tube (10) 



10(9). Leaves less than 1 cm. long, more or less covered with short stiff white 

 hairs; corolla laciniately lobed or erose 9. M. dentilobus. 



10. Leaves 3 cm. long or more, essentially glabrous; corolla lobes entire 



10. M. glabratus. 



11(8). Upper calyx tooth rarely more than twice the length of the others, the 

 lower teeth at maturity usually folding over and only partly closing 

 the orifice 11. M. guttatus. 



11. Upper calyx tooth about 3 times the length of the others, the lower teeth 



in maturity folding over and nearly closing the orifice 



12. M. nasutus. 



1. Mimulus ringens L. 



Perennial by stoloniferous rootstocks. glabrous; stems simple or branched, 4- 

 angled, to 13 dm. high; leaves thin, oblong to oblong-lanceolate, to 1 dm. long 

 and 3 cm. wide, acute to obtuse at apex, tapering to a broad often auriculate- 

 clasping sessile base, serrate to rarely entire; pedicels stout, to 35 mm. long, 

 mostly shorter than the subtending leaves; calyx tubular, 14-17 mm. long, strongly 

 angled, with slender subulate or aristate teeth about one fourth as long as tube, 

 with broad ciliate sinuses; corolla 25-35 mm. long, blue, rarely pink or white, 

 the exserted tube slightly funnelform, the throat nearly closed, upper lip erect 

 and strongly reflexed, lower lip longer and the stigma broadly bilamellate; 

 capsule included, broadly oblong; seeds oblong, papillate, spreading with the 

 margins erose; upper pair of stamens slightly exserted; style exserted, the stigma 

 broadly bilamellate; capsule included, broadly oblong; seeds oblong, papillate. 



In wet places such as wet mud along streams, in marshes, swamps and sloughs, 

 in Okla. (Cleveland and Oklahoma cos.) and possibly in n.e. Tex., June-Sept.; 

 from Can. to Fla., w. to N.D. and s. to Okla. and (?) Tex. 



2. Mimulus alatus Ait. Fig. 693. 



Stems stoloniferous, glabrous, simple or branched, to 7 dm. high, 4-angled, the 

 angles more or less winged; leaves broadly ovate to ovate-lanceolate, acute, to 

 15 cm. long and 6 cm. wide, serrate, tapering to a narrow-margined petiole to 

 25 mm. long; pedicels stout, mostly shorter than the calyx; calyx oblong, 14-17 

 mm. long, with sharp angles, the broad mucronate teeth about 1.5 mm. long; 

 corolla blue or violet, sometimes tinged with pink or rarely white, 2-2.5 cm. long, 

 the tube slightly exserted, the throat nearly closed, lobes of the upper lip erect 

 and strongly reflexed, the lower lip longer and spreading; stamens and style in- 

 cluded; capsule ovoid, obtuse; seeds oval, papillate. 



In wet areas (especially along wooded streams), about lakes and in marshes, 

 in wet mud of ponds, in Okla. (McCurtain, Johnston. Pittsburg, Osage, Mayes, 

 Cherokee, Washington and Ottawa cos.) and in e. Tex., w. to Blackland Prairies, 

 June-Nov.; from Mass., s. to S. C. and w. to Tex. and Okla. 



3. Mimulus Cardinalis Dougl. Crimson monkey-flower. Fig. 694. 



Coarse perennial from a thick rhizome; stems erect or ascending, 3-10 dm. tall, 



1474 



