FLORA OF THE DISTRICT OF COLUMBIA. 243 



9. GLECOMA L. 



1. Glecoma hederacea L. Ground ivy. 



Common on Bhady roadsides and clearings. March-July. Native of Eur. and Asia; 

 widely distributed in N. Amer. (Nepela hederacea Trevis.; N. glecoma Bentli.) ^ 



Gynomonoecious, the perfect flowers being about 14-16 mm. long and the pistillate 

 flowers about half that length. Abnormal forms, such as double flowers, are not rare. 



Moldavia! par vi flora (Nutt.) Britton was collected in waste ground near U Street 

 between Seventeenth and Eighteenth Streets, N. W., June 16, 1896 {Steele). Native 

 farther north and west. (Dracocephalum parviflorum Nutt.) 



10. PRUNELLA L. 

 1. Prunella vulgaris L. Heal-all. 



Common in woods and fields. May-Oct. Throughout N. Amer.; also in Eur. 

 White-flowered forms are not rare. 



Prunella laciniata L., native of Eur., was collected as a waif near Aqueduct Bridge, 

 July 10, 1890 (Coville). 



11. DRACOCEPHALUM L. 



1. Dracocephalum virginianum L. 



Fairly common in scattered localities along the Potomac. July-Sept, Eastern 

 N. Amer. (Physostegia virginiana Benth.) 



D. denticulatum Ait. is listed in Bre'reton's Prodromus; this presumably refers to 

 the lax-flowered form of D. virginianum found here. 



12. LAMIUM L. 



Upper leaves clasping, crenate-toothed 1- L. amplexicaule. 



Upper leaves petioled, merely crenate 2. L. purpureum. 



1. Lamium amplexicaule L. Henbit. 

 Widely scattered throughout the region in woods and waste placeB. March-Oct. 



Native of Eur.; widely naturalized in N. Amer. 

 Forms with white or pink flowers are not rare. 



2. Lamium purpureum L. Dead NE ™ E - 

 Department of Agriculture grounds, Soldiers' Home Park, and near Lock 11, C. & 



0. Canal; probably elsewhere in waste ground. Apr.-Oct. Native of Eur.; natu- 

 ralized in eastern N. Amer. 



13. LEONURUS L. 



1. Leomirus cardlaca L. Motherwort. 

 Common along the banks of the Potomac. June-Sept. Native of Eur. and Asia; 



naturalized in N. Amer. 



14. STACHYS L. 



Leaves moBtly petioled; stems hairy only on the angles L S. aspera. 



Leaves mostly sessile; stems at least slightly hairy on sides and angles. 



2. S. palustris. 



1. Stachys aspera Michx. Hedqe nettle - 

 Moist soil throughout the region. June-Sept. Eastern N. Amer. 



The leaves are generally larger, thinner, and more nearly glabrous than in the 

 next species. 



2. Stachys palustris L. Woundwort. 

 In much the same locations as the preceding species; not common. June-bept. 



Widely distributed in N. Amer. 



