Ontario Weeds: Dentate spurge
Excerpt from Publication 505, Ontario Weeds, Order this publication
Table of Contents
Dentate spurge. Top of plant in fruit.
Stems & Roots: Stems erect, 20-120cm (8-48in.) high, with ascending branches, and roughened with short hairs; leaves mostly opposite, occasionally alternate, linear to ovate, hairy; their margins coarsely to shallowly dentate (toothed) to almost smooth;
Flowers & Fruit: Flowers individually tiny and borne in a complex cup-like structure called a cyathium, as described for Leafy spurge, the rim of the cyathium with 5 oblong, sharply dentate lobes and 1 (or more) short-stalked broad glands; seedpods 3-lobed and containing 3 seeds; the seeds ovoid, rough-tuberculate, 1-3mm (1/25-1/8in.). The entire plant, except its seeds, contains a white, milky juice. Flowers from July to September.
Similar Species: It is distinguished from most other plants by the combination of mostly opposite, coarsely toothed leaves and milky juice throughout, and from other spurges by its stem leaves being almost always opposite and hairy on both sides, and the presence of usually only one gland on the involucre.
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