46 ERYTHEA. 
plant known now as the R. obtusiusculus of Rafinesque, 
for which S. Watson made the synonym of S. ambigens. To 
the Californian species, first collected by Hartweg, and which 
Bentham placed as an unnamed variety of the eastern R. obtu- 
stusculus, Asa Gray was the first to transfer the Geyerian 
name of alismefolius. I have hitherto followed Gray in this 
misapplication of Geyer’s name. The only way out of this 
entanglement is that of rejecting altogether the specific name 
that has been so perverted. Indeed the only description 
extant, of the plant to which Geyer gave the name, is that 
now given above. His species was never published until 
now. This circumstance, taken in connection with the fact 
that the name which he gave in manuscript has long been 
applied to a distinct species, renders necessary the dismissal 
of the name. 
kt. Hartwegi of the Californian Sierra differs essentially 
from the Rocky Mountain R. caltheflorus in its more numer- 
ous and narrow entire leaves, its scattered flowers, and its 
broadly obovate petals only half as numerous, namely, five. 
Asa Gray’s statement that “ R. Bolanderi, Greene, Bull. 
Calif. Acad. ii. 58, answers to the type of this species! ” is 
not only without foundation; it proves that the author did 
not know that Geyer’s type was not Californian. 
Roripa tenerrima. Annual, weak and decumbent, very 
sparingly branching, 6 to 10 inches high, of delicate texture 
and glabrous: leaves few, lyrate-pinnatifid, the terminal lobe 
acutish: rachis of the few racemes almost capillary: pods 
rather distant, subconical, slightly curved, the tapering apex 
surmounted by a considerable beak-like style; valves and 
septum both very thin: seeds many, in 2 rows under each 
valve. 
Collected sparingly, in Modoc Oo., California, 1894, by 
Mrs. R. M. Austin. 
Tissa sparsiflora. Diffuse, slender, glandular-hirsutulous 
throughout; lower internodes longer, the upper rather 
1Proc. Am. Acad. xxi, 368. 
