64 FLORA OF WASHINGTON AND VICINITY. 



tNymphaea odorata, Ait. Sweet-scented Water-Lily. 



In a pool on the summit of a high rocky headland below Great Falls, July 6, 1879. 

 Also found the same year by Mr. William Palmer on the Potomac Flats below the 

 Long Bridge, growing among the Zizania. 



SARRACENIACE^. 



Pitcher-Plant Family. 



tSarracenia purpurea, L. Side-saddle Flower. Pitcher-Plant. 



Meadow between the Washington Driving Park and Bladensburg,. near Beaver 

 Dam Branch. May 21, 1878. 



PAPAVERACEiE. 



Poppy Family. 



Papaver dubium, L. Smooth-fruited Corn-Poppy. 

 High Island, rare. June 23, 1878. 



^Sanguinaria Canadensis, L. Blood-Root. 

 Middle to end of March ; fruit in AprU. 



Chelidonium 7najus, L. Celandine. 

 Not conmion. First half of May. 



FUMARIACE-aS. 



Fumitory Family. 



Dicentra Cucullaria, DC. Dutchman's Breeches. 

 April 4 to 20. 



Corydalis flavula, Raf. Colic-Weed. 



Middle of March to middle of April ; fruit in May. 



tFumaria officinalis, L. Fumitory. 

 Uniontown. May 10 to 30. 



CRUCIFERiE. 



Mustard Family. 



Nasturtium officinale, R. Br. Water-Cress. 



Second week in May ; continues flowering all summer. 



t Nasturtium sylvestre, R. Br. Yellow Cress. 



Hunting Creek and Alexandria. Middle of May. 



Nasturtium obtusum, Nutt. 



Near the Washington Monument. Few reliable characters can be found to dis- 

 tinguish this species from the next. The fruit cannot be depended upon for this 

 purpose. The large, irregular lobes of the lower leaves serve, however, to give it a 

 different aspect. 



Nasturtium palustre, DC. Marsh-Cress. 



Tending to invade the streets and gutters. August and September. 



