104 FLORA OF WASHINGTON AND VICINITY. 



iVeihena. offici7i alls, L. European Vervain. 

 Georgetown. June. 



t Verbena urticaefolia, L. Nettle-leaved Vervain. White Vervain. 



Usually more or less covered ■with a white mold which seoms to be peculiar to 

 this species. Last of July. 



tVerbena angustifolia, Michx. Narrow-leaved Vervain. 

 June. 



tVerbena hastata, L. Blue Vervain. 

 July. 



Lippia lanceolata, Michx. Fog-fruit. 



July. 



LABIAT-ai. 



Mint Family. 



t Trichostema dichotomum, L. Blue Curls. 



The piuk-flowered variety also occurs here. September. 



tisanthus caeruleus, Michx. False Pennyroyal. 

 Flats above the Outlet Lock. August. 



tTeucrium Canadense, L. American Germander. Wood-Sage. 

 First half of July. 



tCollinsonia Canadensis, L. Collinson's Flower. Horse-balm. Rich-weed. 

 Stone-root. 

 Root a large corm-like tuber from which proceed long, slender fibres. First half 

 of September. 



Perilla ocimoide'i, L., var. o-ispa (Gray?). Beefsteak Plant. 

 Crystal Spring. Escaped. First half of September. 



t Mentha rm(?is, L. Spearmint. 

 Last of .July or first of August. 



Mentha piperita, L. Peppermint. 

 August, September. 



tMentha Canadensis, L. Wild Mint. 

 August. 



tLycopus Virginicus, L. Bugle-weed. 



September. 



ILycopus rubellus, Moench. \_L. Europceus, L , var. integrifoliua, Gray.] Water 



HOARHOUND. GiPSYWORT. 

 Lycopus sinuatus. Ell. [L. Europceus, L., var. sjjiwaiHS, Gray.] 

 July. 



t Cunila Mariana, L. Ditt^vny. 



September. 



tPycnanthemum linifolium, Pursh. Mountain Mint. 

 July. 



