Date: XXXXXXXX 2010. Location: XXXXXXXXX(map)
| Classification Hierarchy | |
| Kingdom | Plantae |
| Subkingdom | Tracheophyta |
| Superdivision | Spermatophyta |
| Division | Magnoliophyta |
| Class | Magnoliopsida |
| Subclass | Asteridae |
| Order | Asterales |
| Family | Asteraceae |
| Genus | Cirsium |
| Species | Cirsium undulatum |
Date: XXXXXXXX 2010. Location: XXXXXXXXX(map)
Scientific Name: Cirsius undulatum
Common Name: Wavyleaf thistle
Origin: Native
Notes: A "Primary Noxious Weed" also because of its rariety, this perennial plant is considered a "special concern plant species" in Iowa; habitat, open dry well-drained soils; this plant is very similar to C. floodmanii except the cauline leaves are undulate and not as deeply divided.
Additional references: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
Flowers: June; purplish-pink; involucre 2.5-3 cm; outer phyllaries end in prickles; cypselae 6-7 mm. stems gray or white tomentose.
Leaves: blades oblong 10-40 cm, margins strongly undulate, often entire margined, tipped with yellowish spines.
Glossaries of botanical terms: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
