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. caUichroa Rydb. are given as synonyms under 

 P. nervosa (Hook.) Vasey. In P. caUichroa 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 is in 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 calif omica, 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. Sheldonii Vasey. P. arida and 

 P. Sheldonii are closely related to each other but P. juncifolia 

 is 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 

 Utah, F. megalura in Idaho, F. ovina calligera Piper in Utah, P. 

 idahoensis Piper in Idaho, F. viridula Vasey in Idaho, and F. 

 dasyclada in Utah. Festuca Thurberi is one of the best species in 

 the genus, characterized by its long acuminate ligules. It stands 

 in the same relationship to F. campestris and F. scabrella, as Poa 

 longiligula does to Poa Fendleriana and P. brevipaniculata. 



