Weed Seed: Crupina vulgaris (Common Crupina)
Canadian: Absent from Canada (Brouillet et al. 2016Footnote 1).
Worldwide: Native to northern Africa, Europe and western Asia. Introduced to the western United States and Massachusetts (USDA-ARS 2016Footnote 2).
Duration of life cycle
Seed or fruit type
- Achene length: 3.5 - 4.5 mm
- Achene width: 2.5 - 3.5 mm
- Pappus length: 4.0 - 7.0 mm (mostly 7.0 mm)
- Cuneate achene with a rounded base and flat top, not compressed
- Achene is smooth, with dense hairs that give the appearance of a velvet coating
- Medium brown achene, with dark brown base and pappus
- Often pale hairs around top of achene
- Persistent pappus of stiff bristles that surrounds a style peg at the top of the fruit mixed with several short spines on the inside
Habitat and crop association
Pastures, rangelands, grasslands, hayfields, open woodlands, orchards, vineyards, roadsides, railroads and waste areas. Rarely found in cultivated crops, but may be found in field margins (CFIA 2012Footnote 3).
Common crupina was first discovered in Idaho in 1969 and had infested 9300 hectares by 1981. It was later encountered in the western states of Washington, Oregon and California, where it has since invaded over 26,000 hectares (Thill et al. 1999Footnote 4).
This species prefers well-drained soils and does not tolerate disturbance. Each plant produces on average 23 seeds in a season, leading to a seed production of 1000 seeds per square metre for a typical population (Thill et al. 1999Footnote 4).
Southern crupina (Crupina crupinastrum)
- Achenes are similar length, cuneate shape, dark brown colour and distinctive long bristle pappus as common crupina.
- Southern crupina (1.5 - 2.0 mm wide) is narrower than common crupina, with a paler pappus.
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