40 Flora of Denver. 



310. Verbena stricta VENT. Erect and densely leaved, 

 white hairy all over, flowers in dense spikes at the top of the 

 stem, but leafy at the base of the clusters. Near Montclair. 

 Summer. 



311. Verbena bracteosa MICHX. Decumbent stems branch- 

 ing from the base, leaves variously cut on the margins, spikes 

 dense, bracts leafy, flowers small, corolla blue. Very common 

 on the plains. Summer to fall. 



312. Verbena Aubletia L. This resembles the cultivated 

 Verbena in the shape of the flower clusters and manner of 

 growth, corolla large, dark lilac. Valverde, on the hills. 

 Early summer. 



313. Lippia lanceolata' MICHX. Stems many, long and 

 creeping, leaves narrowed to the stalk, serrate above; flowers in 

 a dense head which becomes spike-like with age. Corolla pink. 



LABIAT/E. (Mint Family.) 



314. Mentha Canadensis L. (MiNT.) Small lilac flowers, 

 clustered in the axils of the upper leaves. Common along the 

 ditches. Summer. 



315. Mentha viridis L. (SPEARMINT.) Escaped from cul- 

 tivation. North Denver. Summer. 



316. Lycopus sinuatus ELL. (WATER-HOREHOUND.) The 

 few sessile flowers clustered in the axils of the sharply serrate 

 leaves, calyx with five long, awn-like divisions. Along the 

 ditches, etc. Common. Summer. 



317. Pycnanthemum lanceolatum PURSH. Reported from 

 near Denver by Dr. Smith. 



318. Hedeoma hispida PURSH. Stems simple or branched 

 below into simple branches, flowers clustered all along the 

 stems in the axils of the short linear leaves. Corolla small, 

 blue, as long as the two-lipped bristly calyx. Along the Platte 

 near Valverde. Summer. It grows' in dense patches. 



