Seed Study - Cirsium undulatum
Species: Cirsium undulatum
Seedling Identification: These seedlings look very similar to Scotch thistle (Onopordum acanthium) seedlings. However the first leaves of wavy leaf are less lobed and have very fine spines off the leaf edges.
Cirsium undulatum – wavyleaf thistle
Average number of good seeds per gram bulk matter: n.m.
Average number of good seeds per gram cleaned: 109 (46)
Commercial estimates of seeds per gram: n.a.
Percent seed: n.m.
Percent live: 67
Collection dates: July 20; August 16; October 6 and 20
Collection effort: 40 grams in 5 person hours
Collection notes: Relatively common and easy to collect however it tends to have a lot of insect damage.
Cleaning notes: Most appeared to be pure seed however a few might have been buggy or empty.
Did You Know?
Lewis and Clark, while on their journey up the Missouri River in 1804, noted that this "wild dog of the prairie...appears here in infinite numbers." More...