MlCmUAN ACADEMY OF SCIENCE. 35.*? 



aud the keel of the lemma euds abruiJtly at the siuus of the two-toothed apex, 

 which characters will place it here. The keels aud awns are sparsely hispid, 

 otherwise the floret is glabrous. 



Atheropogon Muhl. is scarcely distinct gcnerically from lioulclona lijig. 

 The species is Bouicloua cui tipviidula (Mx.) Torr. Dry hillsides near Koch 

 ester, July .'50, 1914, No. 3807. 



rhragmites Triu. is equivalent to Arundo h. Tlie genei'ic description of 

 Linnaeus in tlie 5th ed. of the Genera, page 35, 1754, Is of this genus. The 

 species is Arundo Phragniitcs, L. Keweenaw county, August 8, 1888, No. 641. 

 Parkedale, August 4, 1912, No. 3013. St. Clair Flats, September 27, 1909, 

 No. 641a. Trichoon Roth, 1798, is also a synonym and has 14 years priority 

 over Phragmites Trin. 1812, and is the proper name to be taken up for the 

 genus by those who think Arundo L. equivalent to Donax Beauv. Tlie name 

 would be Trichoon Phragmites (L.) Schinz »& Thell. 



Tricuspis seslerionides becomes T. flava (L. ) Hubbard. 



Brisa media L. Grosse Pointe, July 21, 1906, No. 1986. 



Briza minor L. Grosse Pointe, July 21, 1906, No. 1987. 



Poa flava (L.) of the Michigan Flora is now known as P. palustris L. 



Panicularia Americana becomes P. grandis (S. Wats.) Nash. 



P. fliiitans (L. ) O. K. is an European species, the typical form of which 

 Is found In only a few places in North America. Banks of Detroit River, 

 October 2, 1900, No. 1697. 



P. FLUiTANS var. SEPTENTRiONALis (Hiclik.) u. comb. {P. sei)tenlrioii(tU>< 

 Hitchk. Rhodora VIII, 211, 1906). Has shorter florets and spikelets than 

 the species. Detroit, July 7, 1907, No. 2033 ; Rochester, August 15, 1909, No. 

 2033a ; Parkedale, August 4, 1912, No. 3044 ; Port Huron, June 23, No. 4961. 



P. FLUITANS var. SEPTENTRIONALIS f. GLAUCA, n. f. Whole plant densely 

 glaucous, Rockwood, June 16, 1918, No. 4893. 



P. fluitans var. wngustata Vasey. (P. horealis Nash.) Spikelets aud 

 florets still shorter, especially the former. Detroit, June 17, 1911, No. 22151/. ; 

 Parkedale, July 19, 1914, No. 3727. and July 4, 1918, No. 3030; Bloomfield, 

 June 29, 1918, No. 4999, (Farwell & Billington). The.se various forms show 

 a perfect graduation from one extreme to the other and should therefore be 

 treated as one species, rather than as two or more distinct species. 



Puccinellia Pari, becomes Atropis TriiL The latter name has three years 

 priority over Puccinellia, and is the name in general use by European botan- 

 ists for this group of species. Our species becomes A. airoidcs (Nutt.) Holm. 



FcslKCii oriiKi Ij. var. iliniiiscithi (L.) Koch. t. vilhiKd (Schrad.) As. iV: (Jr. 

 A form in which the lemmas are pubescent. Rochester, July 4, 1901, No. 1722; 

 Algonac, May 24, 1914, No. 3641. 



