86 Steele Additions to the Flora of Washington. 



Great Falls on the Virginia side, and later a few specimens lower down. 



It has not yet been determined. 



5<>2a. Chrysanthemum Parthenium (L.) Pers. 



Canal road near Georgetown, July 9, 1899; dump ground, June .3, 1901. 

 *5O2g. Chrysanthemum Balsamita L. 



Vacant ground, corner of Fifteenth street and Florida avenue, Septem 

 ber 1, 1899. 

 *5Oia. Tanacetum vulgare crispum DC. 



Seventh street road beyond Brightwood, August 2, 1899; seen also at 

 Great Falls. I am not sure that I have seen the type here. 

 *5O2d. Artemisia annua L. 



Glen Echo, between the carriage and electric roads, September 25, 

 1897, abundant; also a few specimens in South Washington, about the 

 same date, and later near Eastern Branch at Pennsylvania avenue. 

 5O2c. Artemisia vulgaris L. 



Roadside, Rosslyn, August 8, 1899. 



503. Arnica acaulis (Walt.) B. S. P. (A. n>(di<-anlix of Ward's Cata 

 logue). 



Takoma Park, south of the electric road junction, May 19, 1897; seen 

 also on the slope south of Four Mile Run near the Southern railroad, and 

 at a point east of Takoma. 

 5107. Arctium tomentosum (Lam.) Schk. 



Dumping ground, river front, June 22, 1898; not common. Our ordi 

 nary species seems to be A. minus Schk.; A. Lappa as now understood 1 

 do not find. 

 517. Centaurea Calcitrapa L. 



Various places in South Washington; seen also on the Bladensburg 

 pike not far from G street. 

 *5i4a. Carduus nutans L. 



South Washington, east of gate to the Arsenal grounds, June 23, 1897. 

 I took some pains to destroy the plant, and do not know whether it 

 survived. 



5i2a. Carduus odoratus (Muhl.) Porter. 



This maintains a precarious existence in Woodley Park. 



