48 Steele — Addifion.-^ to tJic Flom of Wdshliujloii. 



CUIUS I liavc of late left wliolly to tlic skill and kindness of Mr. 

 E. D. Men-ill, who is working with Professor Serihner in that, 

 trying field. Professor C. F. Wheeler has been referee for 

 about all of the Carices that presented difficulties, and I am also 

 the beneficiary of Mr. Geo. B. Sudworth, Mr. Frederick V. 

 Coville, Mr. J. N. Rose, Mr. Charles L. Pollard, and others. 



The arrangement of the list follows the sequence of Engler 

 and Prantl, but the numbers prefixed are those of Professor 

 Ward's Guide to the Flora of Washington and Vicinity (Bull. 

 U. S. Nat. Mus. No. 22, 1881) and the subsequently published 

 additions. In order to preserve the original numeration, and 

 at the same time ])lace the additions in their proper connections, 

 the use of appended letters has been resorted to. 



The prefixed asterisk denotes a species not liitherto recorded 

 in i)rint as Ijelonging to our fiora. In the case of a number of 

 these species my collection has ])i-ol)ab]y been anticipated by 

 that of other collectors whose results have not been jiublished, 

 but it is not practicable wholly to avoid this injustice. On the 

 other hand, some first collected by me have in the same manner 

 been entered in an earlier list. 



*i2i7^/. Pteris aquilina pseudocaudata Cluic. {P. fKpiiUttd (-(nuhila 

 of American authors, not of Linnaeus). 

 Kenilworth. aljundant near the railroad, Spptomber 20, 1900. Also 

 near Hyaltsville. 



i233«. Dryopteris spinulosa (Retz) Kunl/.e. 



In a ditch near Captain Jones' place beyond Chevy Cliase Lake. 

 1234. Dryopteris spinulosa intermedia (IMuhl.) Und. 



Not seen near the cily. Found at Suitland, near Kensiniiton, and near 

 Creat Falls on the Viruinia side. 



1237*/. Onoclea struthiopteris (L.) Hotlm. 



A few sterile fronds. Plummer"s Island, May 31, ISUI. 

 1240. Lygodium palmatum (ISernh.) 8w. 



In a drained swamp, eastern pari of Suitland, Sept. S, ]S()!». 

 *i2i3a. Equisetum robustum A. I>r. 



On both sides of IJeaver Dam Branch, near the road. Rarely found in 

 I'ruil. 



*i253r'. Isoetes saccharata Engelm. 



In tide mud among coarse o-ravel along the Ijay at the mouth of Foin- 

 Mile Run, August 0, 1898. The range as given in Brilton and Brown's 

 Flora is "Wicomico and Nanticoke rivers, eastern Maryland". The 

 following varieties, though not of my own collecting, may be appro- 

 priately published in Ibis place. 



