[Vor. 11 
106 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
greatly in shape, contour, and length, the lower lip generally | 
being longer than the upper. "There is no external evidence of 
nectar glands near the base of the corolla. "With the exception 
of a few species in the sections Eunanus and Diplacus, the corolla 
drops off rather early, this being the chief reason for the loss in 
popularity of Mimulus as a garden flower in European countries. 
The color of the corolla does not offer any satisfactory evidence 
аз to the probable ancestry of the sections. Blue, usually consid- 
ered to be the latest color to develop, is confined to Eumimulus 
and to а small group of Australian species which have been arbi- 
trarily placed in the section Paradanthus. Yellow, which is sup- 
posed to be primitive, is found in all of the species in the specialized 
section Simiolus and in many of the species in Diplacus, Eu- 
nanus, and Paradanthus. Reddish-purple is common in Éunanus 
and Paradanthus and is dominant in GZnoe. Varying shades of 
scarlet appear in Erythranthe and the orange of many of the 
species of Diplacus becomes a deep-red in some of the members of 
that group. Albino forms and other color modifications are 
occasionally encountered and these are considered under the 
species where they occur. The writer feels that where color is 
the only factor separating two forms greater clearness is attain 
by making the specific diagnosis broad enough to include these 
anomalous conditions rather than by using special names to 
designate such forms. 
Stamens.—The Stamens are in two unequal pairs, usually 
equally inserted in the tube and included. The filaments are 
chiefly glabrous but in some species they are puberulent or 
pubescent. The anthers are two-celled, the cells being confluent 
at the apex in most of the groups but coherent for nearly half their 
length along the back in Simiolus and’some of the species in 
Paradanthus. In Simiolus and Eumimulus the anthers are often 
connivent in the younger flowers, separating after dehiscence. A 
number of species have more or less hairy anthers. In Schizo- 
placus the anthers are usually brought close together, forming 
pairs which sometimes simulate a Greek cross. 
Pistil.—The structure of the pistil conforms to that of other 
members of the Scrophulariaceae in being bicarpellary and in 
having a 2-celled ovary with axial placentation. The style is d / 
