[Vor. 11 
112 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
along lines parallel with Eumimulus. With little doubt M. 
pusillus is derived from M. prostratus, being mostly a smaller 
plant with much longer pedicels.. No material was seen of 
М. orbicularis and the published descriptions are not sufficiently 
complete to determine its relationship. It has been left with 
these Australian species because of its thick succulent leaves, 
its creeping stems, and its blue corolla. 
Notwithstanding the fact that the structure of M. Lewisii 
indicates relationship to Erythranthe, it is not possible to include 
it in that section because of its nearly equal corolla-lobes and 
included stamens. М. Eastwoodiae is possibly a later offshoot 
of M. Lewis. А resemblance to M. cardinalis is suggested by 
its densely bearded stamens and by the color of its corolla. It 
is noteworthy in that it is one of the few species in the genus 
which has developed stolons above ground. M. Parishii is a 
peculiar desert form, probably akin to M. Lewisit, in which the 
corolla has become very small, being little longer than the calyx. 
M. dentatus and M. sessilifolius form another close alliance. 
M. sessilifolius is a native of Japan, differing from the North 
American M. dentatus mainly in having sessile leaves. It also 
suggests relationship to M. nepalensis through M. nepalensis var. 
japonica. 'The latter, however, has-closer affinities with the 
M. inconspicuus group. 
M. moschatus is the best-known species of an assemblage of 
more or less viscid-pubescent perennials or annuals with regular 
or irregular yellow flowers and linear or narrowly elliptical dark- 
green leaves. М. moschatus, floribundus, and arenarius are coD- 
spicuous because of the slimy villous hairs which are common in 222 
these species. 
M. pachystylus, primuloides, and Leibergit show no close | 
affiliations with one another or with other groups and may havè 
been derived from older forms now unknown. M. pachystylus 
is one of the few species of Mimulus that has been collected in | 
Chiapas, Mexico. Its bilabiate corolla, unequal calyx- a 
and peculiarly thickened style indicate considerable advance- | 
ment. М. Leibergii has an aspect similar to M. acutidens 80€ | 
may be related to that group. The single specimen seen, how а 
ever, does not show the inflated calyces common to mature e 
