Pluchea camphorata (L.) DC.

Stinkweed

Pluchea_camphorata_plant.jpg
STATS

Native
CC = 4
CW = -3
MOC = 23

© DETenaglia

Family - Asteraceae/Plucheeae

Stem - To 1+ m high, erect, densely pubescent, especially toward tip.

Pluchea_camphorata_stem.jpg Stem.

© DETenaglia

Leaves - Alternate, simple, short petiolate to sessile, not clasping, lanceolate, ovate, or elliptic, tapered as base, margins usually toothed or scalloped, surfaces with sessile glands, abaxial surface pubescent.

Pluchea_camphorata_leaves.jpg Leaves.

© DETenaglia

Inflorescence - Dense clusters at branch tips, flat-topped or rounded in profile.

Pluchea_camphorata_inflorescence.jpg Inflorescence.

© SRTurner

Involucre - 4-6 mm long, the outer bracts triangular-ovate, angled to tapered at the tip, often pinkish- or purplish-tinged, at least toward the tip, the outer surface with sessile, spherical glands and often also minute hairs.

Pluchea_camphorata_involucre.jpg Involucre.

© DETenaglia

Flowering heads - Heads discoid, 5-9 mm in diameter. Corollas 3-6 mm long, pink to pinkish purple. Inner florets few, usually functionally staminate. Outer florets more numerous, pistillate. Pappus in a ring of capillary bristles 3-5 mm long, white or pinkish-tinged.

Pluchea_camphorata_heads.jpg Flowering heads.

© SRTurner

Pluchea_camphorata_heads2.jpg Flowering heads.

© SRTurner

Flowering - August - October.

Habitat - Pastures, bogs, woodlands, ditches, swamps, floodplains, disturbed sites.

Origin - Native to the U.S.

Other info. - This interesting and distinctive species is found mostly in the southern quarter of the state, and in fact lies near the northwestern extent of its natural range there. It is easy to recognize by the strong odor emitted by crushed foliage. Some have described the aroma as akin to camphor, and in fact the specific epithet camphorata means "camphor-scented." To me, however, the odor is musky or fetid and does not in the slightest degree resemble that of camphor. A single plant in my press was sufficient to imbue the entire room with this disagreeable stench, which persisted for some time.

The genus Pluchea is named for French botanist Noel Antoine Pluche (1688-1761). The plant has also been placed in the genus Erigeron.

Photographs taken off Moores Mill Rd., Auburn, AL., 8-26-04 (DETenaglia); also at Otter Slough Conservation Area, Stoddard County, MO, 8-19-2013 (SRTurner).