Eupatorium coelestinum L. - Mist Flower

Eupatorium coelestinum plant

Family - Asteraceae

Stems - To 50cm tall, pubescent, herbaceous, typically single, forming colonies with creeping rhizomes, green to red.

Eupatorium coelestinum stem

Leaves - Opposite, deltoid to ovate, serrate to crenate-serrate, petiolate, to 10cm long, 5cm broad.

Eupatorium coelestinum leavesPressed leaves.

Inflorescence - Typically terminal corymbiform cyme of flower heads, flat to slightly domed. Peduncles dense puberulent, with small subulate bracts to 1mm long.

Involucre - To 5mm tall, campanulate to cylindric. Phyllaries attenuate, imbricate, to -3mm long, .7mm broad, reddish at apex. Flower heads with 30-70 flowers per head.

Eupatorium coelestinum involucreInvolucre.

Ray flowers - Absent.

Disk flowers - Corolla purple to lilac, 5-lobed.  Stamens 5, included. Style well exserted and bifurcate, pink, glabrous. Achenes subterete to 5-angled, 1mm long. Pappus of capillary bristles. Receptacle conic.

Eupatorium coelestinum flowers

Flowering - July - October.

Habitat - Moist ground, low woods, stream banks, ditches, base of bluffs. Also cultivated.

Origin - Native to U.S.

Other info. - This little species can be found mainly in the southern half of Missouri but it also occurs in a few counties north of the Missouri River. It is a striking species. The plant greatly resembles another commonly cultivated genus, Ageratum, but the latter is lacking a pappus, does not spread with creeping rhizomes, and is non-native.

Photographs taken along the shores of the Current River, Shannon County, MO., 7-15-03, and in Lochapoka, AL., 10-5-04.


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