A GUIDE TO THE WILD FLOWERS 175 



528. Snow-on-the-Mountain. Dicrophyllum marginatum. 

 {Euphorbia marginata.) (EupJiorbiaccac.) A milky- juiced 

 annual herb, with alternate lower leaves, and with one cluster 

 of 3 just below the flowers. Leaves oblong, or round-oblong, 

 pointed both ends, about 2 in. long, the upper ones white- 

 margined. Flowers in a showy, leafy umbel, white. Native 

 of the western U. S., cultivated eastward, and sometimes 

 escaping. May-October. Fig. 528. See also Nos. 252, 268, 

 278, 419 and 447. 



529. Sun Spurge. Tithymalus Helioscopia. (Euphorbia 

 Hclioscopia.) (Euphorbiaccac.) A weedy European plant of 

 waste places, with a milky juice, usually not over 12 in. tall. 

 Lower leaves alternate, and one cluster of 5 just below the 

 flowers. Leaves oblong, stalkless, finely toothed, except the 

 upper ones, about 2 in. long. Flowers in a leafy umbel, green- 

 ish and not showy. Newfoundland to N. Y., and westward. 

 June-October. Fig. 529. See also Nos. 252, 268, 278, 419, 

 and 447. 



530. Cypress Spurge. Tithymalus Cyparissias. (EupJfbrbia 

 Cyparissias.) (Euphorbiaccac.) A European weed somewhat 

 resembling No. 529, but the upper leaves in clusters of 8 or 

 10, and linear-oblong, and with the umbel less leafy. Stems 

 often scaly below. Flowers greenish-yellow. In waste places. 

 Mass. to Virginia, and westward. June-October. See also 

 Nos. 252, 268, 278, 419, and 447. 



