Cirsium altissimum f. moorei Steyerm.
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.
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.
Photographs taken at the Kansas City Zoo, 9-5-99.