SPECIES AND VARIETIES. 315 



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

 the stipules seldom fringed. — \Yaste 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, 

 6-8 inches long; leaves linear-lanceolate ; fliowers 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, ^-1 foot high, 



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



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



