102 FLORA OF WASHINGTON AND VICINITY. 



t Gratiola pilosa, Micbx. 



Not commou. A slender, simple form, and a stout, branching form. July, August 



t Ilysanthes gratioloides, Benth. False Pimpernel. 



The sterile stamens consist of erect staminodia with much smaller upwardly 

 curved hooks projecting from them on the outer side. July. 



tMicranthemum Nuttallii, Gray. 



Hunting Creek. September, October. 



+ Veronica Virginica, L. Culver's Physic. 

 July, August. 



Veronica Americana, Schwein. American Brooklime. 

 Near Langley, Va. May 27, 1877. 



t Veronica scutellata, L. Marsh Speedwell. 

 Flats below Eads' Mill. July, August. 



t Veronica officinalis, L. Common Speedwell. 



Last of May or first of June ; autumnal flowers, October 2ti, 1873. 



t Veronica serpyllifolia, L. Thyme-leaved Speedwell. ^ 



A form with large (IS'"'" wide) leaves was found at the mouth of Difficult Run, 

 growing in perpetual shade under the cliffs. First half of May. 



t Veronica peregrina, L. Neckweed. Purslane Speedwell. 

 Last week in April or first of May. 



t Veronica arvensis, L. Corn Speedwell. 

 First week in May. 



Buchnera Americana, L. Blue-Hearts. 



Reform School. July to September. 



tGerardia pedicularia, L. Fern-leaved False Foxglove. 

 Last of August or in September. 



tGerardia flava, L. Downy False Foxglove. 

 Middle to end of July. 



Gerardia quercifolia, Pursh. 



Great Falls. Collected only on October 5, 1879 ; then too far adva,nced. 



tGerardia purpurea, L. Purple Gerardia. 



August, September. 



tGerardia tenuifolia, Vahl. Slender Gerardia. 

 Last of August or first of September. 



tPedicularis Canadensis, L. Wood-Betony. Lousewort. 



April. 

 tPediculaiis lanceolata, Michx. 



Iluuting Creek. Last of September. 



i+Melampyrum Americanum, Michx. Cow-Wheat. 

 Carroll Estate. September. 



