Eupatorium semiserratum Dc.

Smallflower thoroughwort (en)

Species

Angiosperms > Asterales > Asteraceae > Eupatorium

Characteristics

Stems 5–12 dm, mostly solitary from a very short, stout rhizome or crown, densely villous-puberulent, sometimes also atomiferous-glandular, often with loose axillary fascicles of a few reduced lvs; lvs opposite or the uppermost scattered, firm, twisted at the base to bring the blade into a vertical plane, elliptic or elliptic-oblanceolate, mostly 4–8 cm × 8–30 mm, 2.5–6 times as long as wide, gradually narrowed to the sessile or shortly petiolar base, usually serrate or crenate-serrate, especially above the middle, finely and densely puberulent (and often also atomiferous-glandular), sometimes more shortly so above than beneath, triplinerved, the principal pair of lateral veins arising as branches from the midrib; invol 2.5–4 mm, softly short-hairy like the peduncles, its bracts imbricate, broadly rounded or obtuse to sometimes submucronately acute, the inner obscurely scarious-margined; fls 5; cor white, 2.5–3.5 mm; 2n=20. Low woods, clearings, and swampy places; Va. to s. Fla., w. to Tex., and n. into Ark., se. Mo., and s. Tenn. (E. cuneifolium var. s.)
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Perennials, 40–100+ cm. Stems (from short rhizomes) single, densely branched distally, puber-ulent throughout. Leaves usually opposite (distal sometimes alternate, lateral buds dormant or producing 1 pair of leaves); simple, sessile or subsessile; blades ± 3-nerved distal to bases, elliptic to lance-elliptic, (30–)50–70 × 5–25 mm (lengths mostly 2–5 times widths), bases narrowly cuneate, margins usually serrate, apices acute, faces puberulent or villous, densely gland-dotted. Heads in corymbiform arrays. Phyllaries 7–10 in 2–3 series, elliptic, 1–3 × 0.5–1 mm, apices rounded to acute (not mucronate), abaxial faces puberulent, gland-dotted. Florets 5; corollas 2.5–3 mm. Cypselae 1.5–2 mm; pappi of 30–40 bristles 2.5–3 mm. 2n = 20.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.4 - 1.0
Root system rhizome
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Light 4-9
Soil humidity 5-7
Soil texture 1-4
Soil acidity -
Soil nutriment -
Hardiness (USDA) 4-9

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Distribution

Eupatorium semiserratum world distribution map, present in United States of America

Identifiers

LSID urn:lsid:ipni.org:names:206905-1
WFO ID wfo-0000033206
COL ID 6GZPT
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Uncasia semiserrata Eupatorium ambiguum Eupatorium semiserratum Eupatorium parviflorum var. parviflorum Eupatorium cuneifolium var. semiserratum Eupatorium semiserratum var. semiserratum Eupatorium parviflorum