Eupatorium linearifolium
Eupatorium anomalum
waxy thoroughwort
Florida thoroughwort
(from short caudices) single or multiple, branched at or near bases, pubescent throughout.
(from tuberous rhizomes) single, densely branched distally (shoots often develop from lateral buds), puberulent throughout (denser distally).
usually opposite (distal sometimes alternate);
sessile or subsessile;
blades 3-nerved distal to bases, oblong to lance-oblong, 20–45 × 5–10 mm, bases cuneate, margins entire or serrate (teeth mostly proximal), apices acute, faces finely puberulent, gland-dotted.
usually opposite (distal sometimes alternate);
sessile or subsessile;
blades 3-nerved distal to bases, elliptic to oblong, 15–50 × (5–)10–20 mm, bases cuneate, margins entire or serrate (unevenly toothed), apices rounded to acute, faces puberulent (abaxial) or glabrate (adaxial), gland-dotted (both).
5;
corollas 3–3.5 mm.
5;
corollas 3–3.5 mm.
8–10 in 1–2 series, lanceolate (tapering toward apices), 2–5 × 0.5–1 mm, apices rounded to acute, abaxial faces puberulent, gland-dotted.
8–12 in 2–3 series, oblong to lanceolate, 2.5–5 × 0.5–0.7 mm, apices rounded to acute, abaxial faces puberulent throughout.
in corymbiform arrays.
in corymbiform arrays.
2.5–3 mm;
pappi of 30–40 bristles 3–5 mm.
1.8–3 mm;
pappi of 20–35 bristles 3.5–4.5 mm.
= 20, 30, 40.
= 20, 30, 40.
Eupatorium linearifolium
Eupatorium anomalum
Plants treated here as Eupatorium linearifolium were long treated under the name E. cuneifolium; the latter name was superfluous when published (K. N. Gandhi and R. D. Thomas 1991). Because there appears to be a continuous range of variation between diploids that were referred to by V. I. Sullivan (1972) as E. cuneifolium and the series of putative hybrids (with E. hyssopifolium suggested as the other parent) that she called E. linearifolium, these are combined here. The tendency for the plants to branch at or near the bases is distinctive within Eupatorium.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Eupatorium anomalum has been proposed to be intermediate in morphology between E. rotundifolium and E. mohrii and, possibly, a hybrid derivative of that pairing. Molecular data suggest that its derivation is from hybridization between E. serotinum and E. mohrii.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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