Cirsium altissimum f. moorei Steyerm.

Cirsium altissimum plant

Family - Asteraceae

Stems - To +3m, glabrous, not completely winged by extended leaf tissue.

Leaves - Glabrous or slightly hairy above, hairy below, no spines on upper surface, alternate, larger below, reduced towards inflorescence. Margins toothed or lobed or not, flat, spiny.

Inflorescence - Single flower-head terminating each branch of the inflorescence.

Involucre - 2-3.5cm long(high). Bracts imbricate, tightly appressed, ending in spine-like prickle.

Flowers - All discoid, no rays present. Pappus of plumose bristles.

Cirsium altissimum flower

Flowering - July - October.

Habitat - Slopes, thickets, roadsides, railroads, open woodland.

Origin - Native to U.S.

Other info. - This form of C. altissimum is not often found in Missouri. The more common C. altissimum f. altissimum, with pink-rose flowers, is the plant most often seen. This plant can be found on the "Pink Flowers" page of this web site.
"altissimum" means "tall" or "the tallest" in Latin and this plant certainly is, being the tallest member of this genus in Missouri.

Photographs taken at the Kansas City Zoo, 9-5-99.


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