52 Steele — Additions to the Flora of Washinyton. 



1110. Muhlenbergia tenuiflora (Wilkl.) B. S. P. 



Arlington near Four Mile Run, August 27, 1899; Hyattsville, Septem- 

 ber 26, 1900, the latter specimens over 4^ feet long. 



*iiii((. Muhlenbergia palustris Scribn. 



The peculiarities of this grass were noticed in my collection of 1896, 

 but it was distributed as M. diffusa for lack of a better determination. 

 The next year attention was again called to the differential characters, 

 which resulted in its description as a new^ species. Outwardly it is dis- 

 tinguished by its habit, which is even more slender than that of M. dif- 

 fusa, and by its pinlc purple instead of dark purple hue. INIore closely 

 examined, the development of the lower glume will be noticed as the 

 distinctive feature. The type locality is Brightwood Park swamp, which 

 forms the head of Piney Branch. It still exists here, but is suffering 

 much from the spirit of improvement. The only other station known 

 is the wet meadow south of Beaver Dam Branch, west of the Anacostia 

 road. 

 woia. Sporobolus vaginaeflorus (Torr.) Wood. 



This species is now understood by the agrostologists of the Department 

 of Agriculture as including *S. neglectus Nash. A tuft with culms 2-i 

 feet long was found on the Rockville road. 



*li03a. Agrostis intermedia Scribn. 



Arlington, August 11, 1896; Chautauqua, August 17, 1896; also on the 

 river near Cabin John, and on the wooded tlats at Hyattsville. 



iii4«. Calamagrostis Canadensis (Michx.) Beauv. 



Bladensburg, in swamp west of the railroad, found overripe in 1898, 

 and in good condition June 17, 1899. Also seen in a swamp north of 

 Beaver Dam Branch, west of Anacostia road. 

 1169a. Arrhenatherum elatius (L.) Beauv. 



Now abundant near Kalorama, beyond Eckington, etc. I would call 

 attention to the fact that our plant has not only the long awn on the 

 lower flowering scale, but also an awn in a slit at the summit of the 

 upper flowering scale. The cleft sometimes descends one-third the 

 length of the scale, but is generally more shallow. The awn, which is 

 upwardly barbellate, generally o\erlops the scale, but is sometimes 

 about equal to it or even shorter. 



*ii23a. Spartina cynosuroides (L.) Willd. 



One small patch at Jackson City, east of the railroad. Seen in larger 

 quantity on the ri\er flats at Harper's Ferry. 



■*ii23a. Leptocliloa fascicularis (Lam.) A. Gray. 



Sewer, lower part of Duke street, Alexandria, September 4, 1899. 

 1 140. Eragrostis Eragrostis (L.) Karst. 



Parking southwest of Treasury Building, September 28, 1899; also in 

 1900. 

 *ii43a. Eragrostis pilosa(L.) Beauv. 



Jackson City, August \\, 1896; also near Eastern Branch and Upper 

 Paint Branch. 



