SPECIES AND VARIETIES. 315 



prominent glands, the plant being usually pale-green, and 

 the stipules seldom fringed. Waste damp places. 



P. Hydropiper : annual ; stems 1-2 feet high, often de- 

 cumbent at the base ; stipules fringed ; leaves lanceolate, 

 wavy ', flowers in slender, drooping spikes, the clusters of 

 flowers almost all distinct, the perianths dotted with small 

 glands. Water -pepper. Wet ditches and edges of streams. 

 Fl. August, September. 



(262) Thesium. 



T. linophyllum : stems glabrous, procumbent or ascending, 

 68 inches long ; leaves linear-lanceolate ; flowers small, in a 

 terminal, leafy raceme, greenish- white. Chalky pastures, pa- 

 rasitical. Fl. June, July. 



(263) Euphorbia. SPURGE. 



* Glands of the involucre rounded on the outer edge. 



E. Helioscopia : annual ; stems erect, \-\ foot high, simple, 

 or with a few branches ascending from the base ; stem-leaves 

 obovate or broadly oblong, the floral ones broadly obovate or 

 orbicular, very obtuse, minutely-toothed ; umbel of five rays, 

 each ray once or twice forked at the end, flowers and floral 

 leaves crowded into broad leafy heads ; glands of the involucre 

 entire and rounded. Waste and cultivated ground. Fl. June 

 to September. 



** Glands of the involucre crescent-shaped, with the horns 

 turned outwards. 



f Floral leaves all distinct. 



E. Peplus : annual ; stems erect, glabrous, -] foot high, 

 branching from the base ; stem-leaves obovate, entire, the 

 floral-leaves broadly ovate or cordate ; umbel of 2-3 repeatedly 



