Ontario Weeds: Common groundsel
Excerpt from Publication 505, Ontario Weeds,
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Table of Contents
- Other Names
- General Description
- Stems and Roots
- Flowers and Fruit
- Similar Species
- Related Links
Stems & Roots: Stems erect or
somewhat reclining, often branched, 10-60cm (4-24in.) high, smooth,
somewhat fleshy; leaves alternate (1 per node), slightly fleshy,
variable in shape from smooth and almost without teeth to shallowly
or deeply lobed, with the lobes finely to coarsely and irregularly
toothed; lower leaves stalked, upper ones stalkless and often clasping
Flowers & Fruit: Flower heads stalked in clusters at the end of stems and branches; each flower head 5-10mm (1/5-2/5in.) across, cylindrical or conic, without ray florets; disk florets yellowish; involucral bracts (surrounding each flower head) small, overlapping, usually with distinct black tips; seeds small, short-hairy, with a prominent, white, hairy pappus. Flowers from June to late autumn.
Habitat: Common groundsel occurs throughout Ontario, often very abundantly, in gardens, row crops, waste places and roadsides.
Similar Species: Young plants can be distinguished by their irregularly lobed and toothed leaves without white milky juice; older plants by their small conic-cylindrical flower heads with black-tipped involucral bracts around the base of each head.
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