1924! 
GRANT—A MONOGRAPH OF THE GENUS MIMULUS 125 
sessile or petioled, simple, entire, toothed or sometimes lobed, 
the upper commonly much reduced. Flowers solitary, axillary, 
or terminal, often disposed in open racemes. Calyx tubular or 
campanulate, 5-angled, 5-toothed, mostly plicate, persistent and 
often accrescent; teeth equal or unequal. Corolla bilabiate or 
equally lobed, blue, red, reddish-purple, yellow or rarely 
white; tube cylindrical or funnelform, included or exserted, 
expanding gradually or abruptly into a long or short throat;! 
upper lip exterior in the bud, 2-lobed, erect or spreading; lower 
lip mostly longer, 3-lobed, spreading and usually with 2 hairy 
protuberances or patches in the throat. Stamens 4, with no 
indications of a fifth, didynamous, included or exserted ; filaments 
mostly glabrous, more or less adnate to the lower part of the 
corolla; anthers 2-celled, confluent at the apex, base more or 
less divaricate. Pistil bicarpellary ; ovary 2-celled; style glabrous 
or pubescent, commonly longer than the stamens, included or 
exserted; stigma bilamellate or peltate-funnelform, lobes equal 
or unequal. Capsule oblong or linear, 2-valved, often sulcate, 
membranaceous to cartilaginous, loculicidally dehiscent, rarely 
indehiscent; placentae separating and the halves adherent to the 
valves or united and forming a central column. Seeds small, 
numerous, oval, smooth or reticulate. 
Type species: M. ringens L. Sp. Pl. 634. 1753. 
‘SYNOPSIS OF THE SUBGENERA AND SECTIONS 
_ Subgenus І. SvwPLAcus Grant. Placentae completely united 
into a central column or parting less than half way to the base; 
pedicels usually longer than the calyx; style glabrous or puberu- 
lent, rarely pubescent; capsule mostly dehiscent to the base 
along both sutures. 
A. Calyx-teeth equal or subequal. 
a. Corolla-lobes distinctly unequal. қ 
а. Corolla-throat nearly closed by the prominent palate....§ 1. Eumimulus 
8. Corolla-throat broad and more or less open. 
1. Calyx-teeth 4-6 mm. Іопр........................ $ 2. Erythranthe 
П. Calyx-teeth less than 3 mm. long.............-- $ 3. Paradanthus 
b. Corolla-lobes equal or виһедиаЇ........................ $ 3. Paradanthus 
‘The term “throat” is used throughout this monograph with the meaning ex- 
Pressed by Dr. Gray in his ‘Structural Botany’—‘The orifice of a gamopetalous 
corolla or calyx, including any portion between this and the proper tube. 
