142 Rhodora [Jvrv 
Tyre: Western Mountain, Mt. Desert Island, Maine, August, 1902, 
Miss E. L. Shaw in Gray Herb. 
This form includes the plants referred in eastern America to P. 
vulgare, vars. cambricum (L.) Willd., semilacerum Moore and sinua- 
tum Willd. It is well illustrated by Waters, Ferns, 83 (1903), and by 
Buchheister, Am. Bot. v. 55, fig. 1 and 57, fig. 4 (1903). 
Forma chondroides, n. nom. P. vulgare, var. bifido-multifidum 
Gilbert, Fern Bull. xiv. 39 (1906), not Druery. 
Forma alato-multifidum (Gilbert), n. comb. P. vulgare, var. 
alato-multifidum Gilbert, Fern Bull. xiv. 105 (1906). 
Forma Churchiae (Gilbert), n. comb. P. vulgare, var. Churchiae 
Gilbert, Fern Bull. xiv. 39 (1906). 
CALAMAGROSTIS CANADENSIS AND SOME RELATED 
SPECIES. 
O. L. INMAN. 
Tue species of the boreal genus Calamagrostis have always been 
difficult to separate. This has been especially true in those groups of 
species where the habit of the inflorescence has been used as a key- 
character; to a great extent the density of the panicle is determined 
by age, young panicles of C. canadensis, for example, having loosely 
spreading branches, while the old panicles are dense, with closely 
appressed branches. 
In an attempt to determine if there are more fundamental characters 
in the section including Calamagrostis canadensis (Michx.) Nutt. and 
closely related species—see Kearney, Bull. U. S. Div. Agrost. 11: 
26-31 (1898)—the abundant material at the Gray Herbarium has 
been studied, and it has been found that the spikelets, as would be 
expected, present characters of great constancy. "The results of this 
study are presented in the following key. 
It will be noted at once that Calamagrostis canadensis (Michx.) 
Nutt. is not ascribed, as is usually done, to Beauvois as the author. 
While Beauvois used the name C. canadensis he failed to give any 
reference or description and according to the International! Rules of 
Nomenclature (art. 37) his publication is not valid. After examina- 
tion of a large number of specimens, mostly from eastern America 
and Alaska, it has become evident that the maintaining of Cala- 
