292 . PITTONIA. 
herbaria form an aggregate which I should long since have 
attempted to resolve but for a feeling of uncertainty as to 
which should be considered as representing the type of the 
species. It is not improbable that Nuttall himself distrib- 
uted more than one species under this name. The Nuttal- 
lian specimen known to Asa Gray was found by him not 
in harmony with the published character; and the one 
examined by me at the British Museum does not well answer 
the description. However, the form well known now as 
inhabiting the region traversed by Nuttall is the only one 
of the entire aggregate which has the rough pubescence 
and the blue rays named by him as essential characters; 
and this is ordinarily twice or thrice as large as Nuttall 
allowed; though it is well known, by all who have seen 
many of his types, that he always chose small specimens, if 
not even mere fragments, of the larger species. What I 
take to be the real E. corymbosus is commonly much more 
than a foot in height, and is well represented in Mr. Heller’s 
n. 3377; Mr. Leiberg’s n. 643, and Mr. Cusick’s n. 1822, all 
from along the line of Nuttall’s travels; while Mr. Suks- 
dorf’s n. 670, much smaller, is quite at agreement with the 
original description, even as to the small dimensions, yet is 
the same thing, specifically, and from the same general 
region. The coarse rough spreading pubescence, hispid 
involucres, and narrow blue rays, are easy marks by which 
to separate it from the following. 
E. PLANTAGINEUs. Stems clustered on rather slender 
hard somewhat tortuous roots or rootstocks, mostly 6 to 10 
inches high, little surpassing the radical leaves, and them- 
selves rather foliaceous with much reduced leaves: herbage 
with a sparse fine wholly appressed pubescence : lowest 
leaves 4 to 4 inches long including the slender petiole, the 
black narrowly lanceolate, acute or obtuse, very conspic- — 
uously 3-nerved throughout, entire: heads solitary, or sev- — 
eral and subcorymbose; involucres hemispherical, 4 or A 
