RYDBERG: STUDIES ON THE Rocky MounrTAIN FLORA 17 
cited. Agoseris attenuata Rydb. is given as a synonym of 7. 
pubescens (Rydb.) A. Nels. <A. attenuata has perfectly glabrous 
leaves, only the involucre and the upper part of the scape being 
villous. It would be included in Agoseris pumila (Nutt.) Rydb., 
were it not for the decidedly acuminate inner bracts. It has very 
little indeed to do with the decidedly pubescent A. pubescens. 
Agoseris maculata Rydb. is made a synonym of Troximon 
villosum (Rydb.) A. Nels. It is true that they much resemble 
each other in general habit and pubescence, but the outer bracts 
in A. villosa are obtuse or even rounded at the apex, while those 
of A. maculata are abruptly and distinctly acuminate. A. villosa 
is a plant of the lowlands of Montana, westward and northward, 
while A. acuminata is an alpine or subalpine plant of the moun- 
tains of Colorado. 
Troximon roseum Nutt., Agoseris agrestis Osterhout, and A. 
roseata Rydberg are made synonyms of Troximon glaucum. 1 
have not seen the type of 7. roseum Nutt., but, as I interpret it, 
it is a plant closely related to T. laciniatum Nutt., not to T. 
glaucum. Agoseris-agrestis Osterhout is related to A. glauca, but 
if made a synonym of anything it should be of Troximon pumilum 
Nuttall, having the same pubescent involucral bracts, but the 
leaves are pinnatifid and caudate-acuminate instead of entire and 
obtuse or rounded at the apex. 
Under Troximon glaucum dasycephalum Professor Nelson gives 
a citation from Piper’s Flora of Washington: ‘‘This plant differs 
from T. glaucum only in having a pubescent involucre. It is 
scarcely worth nomenclatural recognition.” I think that both 
Piper and Nelson are incorrect in this statement. In Agoserts 
glauca (Nutt.) Greene the involucre is decidedly obconic, and 
the leaves narrowly oblanceolate or linear and glaucous; in A goseris 
scorzoneraefolia (Schrad.) Greene (Troximon glaucum dasycepha- 
lum T. & G.) the involucre is decidedly campanulate, sometimes in 
age almost hemispheric, the outer bracts and the leaves broader, 
and the latter scarcely glabrous. Those who have access to the 
Botanical Magazine may compare plate 1667 and plate 3462, which 
give good illustrations of Agoseris glauca and A. scorzoneraefolia 
respectively. 
- Under Troximon glaucum dasycephalum, Agoseris altissima is 
