SEGREGATES FROM ASTER. 5 
being prismatic rather than compressed, and the latter much 
too fine and soft. As a genus, OCLEMENA bears much the same 
relation to Aster which Zrechittes bears to Senecio. 
I am also now persuaded that the genus is not monotypical, 
and would name as a second species O. NEMORALIS, this being 
of course the Aster nemoralis, Ait., which, seeing it was no 
Aster, I formerly transferred to Eucephalus, where it was not 
well at home. It has the same habit, and the same reproduction 
by tubers which the type species portrays, though its pappus is 
firmer, and its achenes, though 5-angled, are a little compressed. 
Whether its heads are nodding before expansion or erect I do not 
know, never yet having had the fortune of seeing the plant 
alive. That in the type species the heads are nodding before 
expansion has now at last been announced by Mr. Small in his 
new book already famous. 
The genus ViIRGARIA proposed by Rafinesque I have wished 
for years to be able so to extend as to include in it Aster sericeus 
and its allies. They are all wiry and coriaceous things as to 
texture, with silvery-silky foliage and peculiarly foliaceous 
involucres—plants abundantly distinct from the type of Aster. 
But Virgaria concolor, Raf., stands apart from the others in 
several particulars. Its mode of growth and propagation 
underground, its inflorescence and its flowers—those of the disk 
being never yellow, but at first white, then rich purple—and 
then its silky villous achenes, all combined bespeak its title to 
the rank of a genus from which its kindred of the west and 
south must needs be separated. 
To them I accord generic rank under the name LASALLEA. 
Their heads are large and solitary; their disk-corollas at 
first yellow, then becoming brown; their achenes perfectly 
glabrous. The species seem to be about three: L. SERICEA 
(Vent. under Asżer), L. NUTTALLII (Aster montanus. Nutt. not 
of Allioni) and L. PAEYLLOLEPIS (T. & G. under Aszer). 
When in 1896 I was studying Dedingeria (Pitt. iii. 50) as a 
necessary segregate from the Linnean 4szer, I would fain have 
made positive Nees’ doubtful placing of Aster ptarmicoides in 
