THE MALLOW FAMILY 111 



Sun Spurge is a common weed in gardens and waste places. 

 Cultivated in Europe for decoration. Most troublesome on 

 light, sandy soils. The seeds are a frequent impurity in commer- 

 cial seeds. Clear up waste places and seed to permanent grass. 

 Hand-pull and hoe in gardens. Special care is required to pre- 

 vent the ripening of seed late in the summer. It will not long 

 trouble lands worked under a short rotation with clean cultivation. 



Ridge - seeded Spurge (Euphorbia glypto-sperma Engelm) 

 is an erect, spreading, hairless, annual plant, with linear- 

 oblong leaves and sharply four-angled seeds; common on gravelly 

 soils in fields and waste places in Ontario and locally in the 

 Prairie Provinces and British Columbia. 



Milk Purslane (Euphorbia macvlata L.) is abundant along 

 railways or waste places and in cultivated fields in Ontario and 

 occasionally westward. It is a prostrate plant with minutely 

 downy stems, linear-oblong leaves, pods acutely angled, seeds 

 gray, small, sharply four-angled, with four shallow grooves 

 across each concave side. 



Flowering Spurge (Euphorbia corollata L.) is common on dry, 

 sandy soils in western Ontario. Erect, with deep rootstocks, 

 hairless or sparingly hairy. This plant may be distinguished 

 by the showy white appendages, like corolla divisions, of the 

 forked umbrella-like flowering clusters. 



THE MALLOW FAMILY (Malvaceae). 



This family is represented by a relatively small number of 

 species of herbs and shrubs. Two species deserve mention 

 as weeds of secondary importance. 



Spiny Sida (Sida spinosa L.) is a profusely branched herb, 

 about 1 foot high, covered with soft hairs. Leaves oblong or 

 egg-shaped on long footstalks, dentate, with sharp teeth 

 pointing forward. Flowers greenish-yellow, small and shaped 

 like those of the hollyhock. 



Round-leaved Mallow, Common Mallow or Cheeses (Malva 

 rotundifolia L.) is a common garden weed, well known by its 

 round, scalloped leaves, white and pink flowers and the 

 arrangement of the seeds in the form of a cheese. The seeds 

 are unusually long-lived. 



