Flora of North America species comparison

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Eupatorium mohrii

Mohr's thoroughwort
Habit 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.
Florets

5;

corollas 2–4 mm.
Phyllaries

7–10 in 1–2 series, oblanceolate, 1–3 × 0.2–0.5 mm, apices rounded, abaxial faces puberulent, gland-dotted.
Heads

in corymbiform arrays.
Cypselae

1–2 mm;

pappi of 20–30 bristles 2.5–3 mm.
2n

= 20, 30, 40.

Eupatorium mohrii
Phenology Flowering Jul–Sep.
Habitat Moist, low ground, margins of ponds, sandy soils
Elevation 10–100+ m (0–300+ ft)
Distribution
from FNA
AL; FL; GA; LA; MS; NC; SC; TX; VA
[WildflowerSearch map]
[BONAP county map]
Discussion

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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 470.
Parent taxa Asteraceae > tribe Eupatorieae > Eupatorium
Sibling taxa
E. album, E. altissimum, E. anomalum, E. cannabinum, E. capillifolium, E. compositifolium, E. godfreyanum, E. hyssopifolium, E. lancifolium, E. leptophyllum, E. leucolepis, E. linearifolium, E. mikanioides, E. perfoliatum, E. petaloideum, E. pilosum, E. resinosum, E. rotundifolium, E. semiserratum, E. serotinum, E. sessilifolium, E. ×cordigerum, E. ×pinnatifidum
Synonyms E. recurvans
Name authority Greene: Contr. U.S. Natl. Herb. 6: 762, plate 11. (1901)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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