Eupatorium mohrii


Contr. U.S. Natl. Herb. 6: 762, plate 11. 1901.

Common names: Mohr’s thoroughwort
Synonyms: Eupatorium recurvans Small
Treatment appears in FNA Volume 21. Treatment on page 470. Mentioned on page 464, 466, 468.

Perennials, 30–100+ cm. Stems (from tuberous rhizomes) multiple, densely branched distally, puberulent throughout. Leaves usually opposite (distal sometimes alternate); sessile or subsessile; blades 3-nerved distal to bases, oblanceolate, 20–80 × 5–10(–20) mm, bases cuneate, margins serrate proximally, entire distally, apices acute, faces puberulent (abaxial), glabrous or glabrate (adaxial), gland-dotted. Heads in corymbiform arrays. Phyllaries 7–10 in 1–2 series, oblanceolate, 1–3 × 0.2–0.5 mm, apices rounded, abaxial faces puberulent, gland-dotted. Florets 5; corollas 2–4 mm. Cypselae 1–2 mm; pappi of 20–30 bristles 2.5–3 mm. 2n = 20, 30, 40.

Phenology: Flowering Jul–Sep.
Habitat: Moist, low ground, margins of ponds, sandy soils
Elevation: 10–100+ m



Ala., Fla., Ga., La., Miss., N.C., S.C., Tex., Va.


As treated here, Eupatorium mohrii includes both sexual diploid (sometimes segregated as E. recurvans) and apomictic polyploid populations that are suggested by molecular data to be autoploids. Eupatorium saltuense refers to hybrids shown by molecular data to involve E. mohrii and E. serotinum. Molecular data also document frequent hybridization with E. rotundifolium.

Selected References


Lower Taxa

... more about "Eupatorium mohrii"
Kunsiri Chaw Siripun +  and Edward E. Schilling +
Greene +
Mohr’s thoroughwort +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +, Tex. +  and Va. +
10–100+ m +
Moist, low ground, margins of ponds, sandy soils +
Flowering Jul–Sep. +
Contr. U.S. Natl. Herb. +
Eupatorium recurvans +
Eupatorium mohrii +
Eupatorium +
species +