1924] 
GRANT—A MONOGRAPH OF THE GENUS MIMULUS 121 
common along the coast from Alaska to Mexieo and inland as 
far as the Rocky Mountain states. It is noteworthy that the 
widely distributed species in Mimulus grow only in wet places 
and it is therefore probable, as Pennell! suggested, that birds 
are instrumental in the dispersal of the seeds, carrying them in 
mud on their feet. 
In contradiction to these widely distributed members of the 
genus, all of the rest of the species have а more or less restricted 
range. Тһе majority of the species in Schizoplacus are confined 
to California where most of them are localized in relatively 
small areas. Tropanthus is exceptional in that its only species is 
apparently limited to Tehuacan in southern Mexico. (noe and 
Diplacus are practically confined to California, two species in 
(Enoe and one in Diplacus occurring in southern Oregon and two 
species іп Diplacus appearing in the northern part of Lower 
California. Eumimulus is interesting in this connection as it 
s the only section besides Tropanthus in which none of the 
members are found in California. 
Habitat.—In habitat there is considerable diversity. Prac- 
tically all of the species of Eumimulus and Simiolus grow in 
shallow standing water, in swamps, or along the banks of running 
streams and are therefore decidedly hydrophytic. Тһе members 
of Erythranthe are usually found along the edges of stream banks. 
Many of the species in Paradanthus grow thickly in spots from 
which water has evaporated after standing all winter. This is 
also true of most of the species іп Œnoe and for some of those in 
Eunanus. Most Eunanus species, however, are found in dry 
open sandy places, the plants often forming large patches in 
granite sand on exposed slopes. Several of the species commonly 
follow chaparral fires. Diplacus, one of the two shrubby groups 
in the genus, grows in fairly dry places and is sufficiently abundant 
in some situations to become a component of the chaparral. 
Mimulastrum and Pseudoenoe belong in hot dry regions occurring 
only in the desert or semi-desert areas in California. Tropanthus 
has coriaceous leaves covered with sessile glands which indicate 
that it grows in exposed places. Thus, within the genus, there 
are plants which аге hydrophytic, mesophytic, ог xerophytic. 
"Pennell, in Contr. U. S. Nat. Herb. 20: 314. 1920. 
