abc ..
Plants of fields, roadsides, open disturbed areas.  Flowers August to September.  Not native.  Invasive in numerous states.

Perennial from rhizomes, tending to form large colonies.  Stems are often many-branched, sometimes from near base; pubescent with short, appressed or matted hairs.  Typical height is 3 to 6 feet.

The overall inflorescence is often pyramidal in shape, peaked.  Branches are ascending, often arching to recurved.  Branch inflorescences are raceme-like, sometimes elongated.

Flower heads are discoid, very small, containing a mix of pistillate, bisexual and/or staminate florets.  Ray florets are lacking.  Peripheral florets are pistillate and fertile.  Bisexual florets are fertile; the corollas yellowish to reddish.  Involucral bracts largely conceal florets, and are pubescent with matted or cobwebby hairs.

Leaves are highly variable in color, size and shape; generally deeply lobed; the lobes sometimes also lobed.  Upper surfaces are dark to pale green, glabrous or nearly so.  Lower surfaces are whitish with a dense covering of matted hairs.

Cypselae are ellipsoid, without pappus.

.

.

.

.

.

.

.


Images and text copyright  botphoto.com  and Arieh Tal, 1990 to 2016.  All rights reserved.  ( Terms of use )
.