Cirsium pumilum var. hillii (Nutt.) Spreng.
Family: Asteraceae
Hill's thistle,  more...
[Cirsium hillii (Canby) Fernald,  more]
Cirsium pumilum var. hillii image
Frank Hassler  
Etymology: Hillii = for Ellsworth Jerome Hill (1833-1917), a Presbyterian minister and an American botanist. Plants: erect, biennial/(perennial?), 1'-3' tall, spiny, sweet smelling forb with thick, hollow roots
Leaves: basal leaves often edged with red and in a large, persistent rosette
Flowers: head 1 1/2"-2" wide with purple disk flowers; inflorescence usually solitary or a few heads; blooms June-Aug.
Fruits: dry seed on fluffy, feathery-divided pappus
Habitat: sun; prairies; in sandy soil
Conservation Status: Threatened
Stout stocky spiny perennials 2-.5 dm tall, from a deep, hollow taproot, to 7 dm long. Stem prominently and densely white-pilose, each of the 1-3 (-5) branches terminated by a single large purple-flowered head. Cauline and basal rosette leaves green, sparsely crisped-hispid above and beneath, oblanceolate, repand to shallowly or deeply undulate-pinnatifid, the lobes oblong, rounded to acute with spiny margins. Heads light rose-purple; involucre (3) 3.5-4.6 cm high, the bracts lanceolate, with a dark glutinous dorsal ridge (difficult to determine in old heads), loosely appressed, the outer tipped by short spines. Achenes (3-)3.5-5 mm long, light brown, ye]]ow at the base of pappus.

Johnson, M.E. and H.H. Iltis. 1963. Preliminary reports on the flora of Wisconsin: No. 48. Compositae Family. Wisconsin Academy of Sciences, Arts & Letters. 52:255-342.

S. and SW. Wisconsin, now rare and local on dry, steep, calcareous hill prairies, as well as in deep soil or sandy prairie relics along railroads, apparently introduced in Douglas and Racine Counties and probably also in Marinette County. Flowering from mid-June through July (-August); fruiting from late July to mid-August (-September). This beautiful and very characteristic species of dry prairies needs protection from extinction.

Johnson, M.E. and H.H. Iltis. 1963. Preliminary reports on the flora of Wisconsin: No. 48. Compositae Family. Wisconsin Academy of Sciences, Arts & Letters. 52:255-342.

Cirsium pumilum var. hillii image
Frank Hassler  
Cirsium pumilum var. hillii image
Kitty Kohout  
Cirsium pumilum var. hillii image
Mark Mittelstadt  
Cirsium pumilum var. hillii image
Frank Hassler  
Cirsium pumilum var. hillii image
Josh Sulman  
Cirsium pumilum var. hillii image
Merel R. Black  
Cirsium pumilum var. hillii image
Botanical Illustration  
Cirsium pumilum var. hillii image
Thomas A. Meyer  
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
Cirsium pumilum var. hillii image
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