1924] : 
GRANT—A MONOGRAPH OF THE GENUS MIMULUS 105 
Inflorescence.—In the majority of cases the flowers are solitary 
in the axils of the leaves, those in several species beginning at or 
near the base of the plant. In Humimulus and Simiolus the 
inflorescence is usually racemose; the form of the inflorescence is 
of little or no value, however, in the recognition of sections in 
Mimulus. The length of the pedicels has been used by several 
taxonomists as & character of definite importance in separating 
some of the segregates of the genus, notably Eunanus. Тһе rela- 
tive length of the pedicel and calyx holds within the subgenus 
Schizoplacus but varies considerably within the sections in Syn- 
placus. Here the pedicel may be either shorter or longer than 
the calyx, thus making such a character useful only in minor 
categories. The amount of curvature of the pedicels is helpful 
in specific diagnosis alone. 
Calyx.—The persistent, 5-angled, more or less plicate calyx 
is one of the most constant characters within the genus and the 
most satisfactory to use in separating Mimulus from its nearest 
relatives. In a few species, such as M. Rattani, decurtatus, and 
exiguus, the angles are weak and the calyx almost suleate. This 
would indicate close relationship to Mimetanthe, the only segre- 
gate of Mimulus which is recognized in this monograph. The 
calyx-teeth are conduplicate in the bud. In anthesis, they vary 
from almost obsolete, as in M. Grayi, to those from one-half to 
one-third the length of the tube, as in several species of Eunanus 
and Paradanthus. The inflated calyx common to the members 
of the section Simiolus and to some of the species in Paradanthus 
is considered to be an advanced condition. iiis 
Corolla.—The shape of the corolla shows great diversity within 
the genus but in general it сап be relied on for broad sectional 
characterization. The most primitive type is probably that 
which we find in some of the species in the sections Paradanthus 
and Eunanus. Here the corolla is funnelform with an open 
throat and has equal or nearly equal lobes. The bilabiate and 
personate corollas found in the other groups are probably derived 
from some such condition. The tube may be included or it may 
be from two to four times as long as the calyx, the latter condi- 
tion assuredly indicating specialization. The throat usually is 
exserted and may be funnelform or cylindrical. The lobes vary 
