Classification Hierarchy
Kingdom Plantae
Subkingdom Tracheophyta
Superdivision Spermatophyta
Division Magnoliophyta
Class Magnoliopsida
Subclass Asteridae
Order Asterales
Family Asteraceae
Genus Cirsium
Species Cirsium undulatum
Wavyleaf thistle

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.

Field Marks for Identification:

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.

Wavyleaf thistle-1 Wavyleaf thistle-2 Wavyleaf thistle-3 Wavyleaf thistle-4