FLORA OF THE DISTRICT OF COLUMBIA. 243 



9. GLECOMA L. 



1. Glecoma hederacea L. ' Ground rvT. 



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

 widely distributed in N. Amer. (Nepcta hederacea Trevis.; N. glecoma Benth.) 



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

 flowers about half that length. Abnormal forms, such as doul)le flowers, are not rare. 



Moldavica parviflora (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. (Dracocephaliim 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. 



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

 July 10, 1890 (Coville). 



11. DEACOCEPHALUM L. 



1. Dracocephalum virginianum L. 



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

 N. Amer. (Physostegia virginiana Benth.) 



D. dentictdatum Ait. is listed in Brereton's Prodromus; this presumably refers to 

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



12. LAMITIM 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 places. March-Oct. 



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

 Forms with white or pink flowers are not rare. 



2. Lamium purpureum L. Dead nettle . 

 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. LEONURTJS L. 



1. Leonurus cardiaca L. Motherwort. 

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



naturalized in N. Amer. 



14. STACHYS L. 



Leaves mostly petioled ; stems hairy only on the angles 1. S. aspera. 



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



2. S. palustris. 



1. Stachys aspera Michx. Hedge 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-Sept. 



Widely distributed in N. Amer. 



