RYDBERG: STUDIES ON THE ROCKY MOUNTAIN FLORA 105 
Torrey Herbarium there are a few spikelets of P. crocata Michx., 
and I have seen the type of P. caesia strictior. The plant is the 
most common species that has been known under the name P. 
nemoralis in the Rockies. It is intermediate between P. interior 
Rydb. and P. rupicola Nash, in habit resembling more the latter, 
but the cobweb is present. 
In the New Manual of Botany of the Central Rocky Moun- 
tains, Poa Tracyi Vasey, P. flexuosa occidentalis Vasey, P. occiden- 
talis Rydb., and P. callichroa Rydb. are given as synonyms under 
P. nervosa (Hook.) Vasey. In P. callichroa the cobweb is present, 
and that species is related to P. arctica although much larger. In 
the rest the cobweb is wanting. The plant described by Professor 
Nelson is P. occidentalis (Vasey) Rydb. If P. Tracyi Vasey is the 
same I do not know, but P. nervosa (Hook.) Vasey is a different 
plant. A duplicate of the type isin the Torrey Herbarium. In this 
species the glumes are very thin and the nerves very prominent, 
Stronger than in any other species of Poa known to me. 
Poa californica, P. andina Nutt., and P. brevipaniculata S. & W. 
are given as synonyms under P. Fendleriana. Poa brevipaniculata 
is very hard to distinguish from P. Fendleriana and may well be 
reduced to synonomy. Poa californica, under which name P. 
Fendleriana has been masquerading and under which it is described 
in the old Coulter’s Manual, is an entirely different plant, related 
to P. nevadensis and P. Buckleyana and not found in the Rocky 
Mountain region. P. andina Nutt. is also entirely distinct. P. 
arida Vasey and P. pratericola Rydb. & Nash were based on P. 
andina Nutt. These two as well as P. juncifolia Scribn. are cited 
by Nelson as Synonyms under P. Sheldonit Vasey. P. arida and 
P. Sheldonii are closely related to each other but P. juncifolia 
18 more closely related to P. laevigata. 
In Festuca the following species have been collected in the 
Rocky Mountains: F. pacifica in Utah and Idaho, F. reflexa in 
Uta » F. megalura in Idaho, F. ovina calligera Piper in Utah, P. 
tdahoensis Piper in Idaho, F. viridula Vasey in Idaho, and F. 
Syclada in Utah. Festuca Thurberi is one of the best species in 
the s€nus, characterized by its long acuminate ligules. It stands 
= the same relationship to F. campestris and F. scabrella, as Poa 
longiligula does to Poa Fendleriana and P. brevipaniculata. 
