Eupatorium mohrii

Greene

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

Common names: Mohr’s thoroughwort
Endemic
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), glanddotted. Heads in corymbiform arrays. Phyllaries 7–10 in 1–2 series, oblanceolate, 1–3 × 0.2–0.5 mm, apices rounded, abaxial faces puberulent, glanddotted. 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

Distribution

V21-1177-distribution-map.gif

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

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.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Eupatorium mohrii"
40 +, 30 +  and 20 +
not tailed +, truncate +, rounded +  and obtuse +
scarious +
usually ovate +  and lanceolate +
usually terete +  and clavate +
diffuse +  and dense +
indeterminate +  and determinate +
Kunsiri Chaw Siripun +  and Edward E. Schilling +
Greene +
puberulent +
cuneate +
enlarged +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
dissected +, lobed +, toothed +  and entire +
oblanceolate +
5mm;10mm +
papillate +  and rugose +
(4-)5-angled;10-ribbed +
filiform +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Mohr’s thoroughwort +
pinkish +  and white +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
prismatic +
fertile +  and bisexual +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +, Tex. +  and Va. +
10–100+ m +
glabrate +, glabrous +  and puberulent +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Moist, low ground, margins of ponds, sandy soils +
in usually determinate , rarely indeterminate , arrays +  and singly +
indeterminate +
each +  and sessile +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
obconic;ellipsoid +
subsessile +  and sessile +
triangular +
entire +  and serrate +
2-carpellate +
persistent +
Flowering Jul–Sep. +
nerved +  and 2-3-nerved +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
7 +  and 10 +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Contr. U.S. Natl. Herb. +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
exalbuminous +
appendaged +  and truncate +
hirsutulous +
papillate +
Eupatorium recurvans +
Eupatorium mohrii +
Eupatorium +
species +
campanulate +
toothed +  and entire +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
vine +, shrub +  and subshrub +