Eupatorium rotundifolium |
Eupatorium capillifolium |
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round-leaf boneset, round-leaf thoroughwort, roundleaf eupatorium |
dogfennel |
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Habit | Perennials, 40–100+ cm. | Perennials, 50–200 cm. | ||||||||
Stems | (from short rhizomes) single, sparsely branched distally, puberulent. |
(from short caudices) multiple, branched distally, puberulent throughout. |
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Leaves | usually opposite (distal sometimes alternate, lateral buds dormant or producing 1 pair of leaves); sessile or subsessile; blades ± 3-nerved, usually ± deltate to orbiculate, sometimes ovate, 15–50(–70) × 15–40(–60) mm (lengths mostly 1–2 times widths), bases broadly rounded to truncate, margins crenate to serrate, apices acute, faces puberulent to villous, gland-dotted. |
opposite (proximal) or alternate (nodes often appearing leafy because of development of leaves on lateral buds without axis elongation); sessile; blades (often ternately lobed) or lobes linear, 5–100 × 0.2–0.5(–1) mm, bases ± cuneate, margins entire (strongly revolute), apices rounded to acute, faces glabrate, gland-dotted. |
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Florets | 5; corollas 3–4 mm. |
5; corollas 2–2.5 mm. |
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Phyllaries | 8–10 in 2–3 series, elliptic to oblanceolate, 2–6 × 0.5–1.5 mm, apices acute, abaxial faces puberulent, gland-dotted. |
8–10 in 2–3 series, oblong, 0.5–2.5 × 0.2–0.5 mm, apices acuminate and mucronate, abaxial faces glabrous or glabrate, not or little, if at all, gland-dotted. |
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Heads | in corymbiform arrays. |
in dense, paniculiform arrays. |
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Cypselae | 2–3 mm; pappi of 30–40 bristles 3.5–4 mm. |
1–1.7 mm; pappi of 20–30 bristles 2–2.5 mm. |
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2n | = 20. |
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Eupatorium rotundifolium |
Eupatorium capillifolium |
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Phenology | Flowering Aug–Oct. | |||||||||
Habitat | Old fields, open sites, roadsides, flatwoods | |||||||||
Elevation | 10–300 m (0–1000 ft) | |||||||||
Distribution |
AL; AR; CT; DC; DE; FL; GA; IN; KY; LA; MA; MD; MO; MS; NC; NH; NJ; NY; OH; OK; PA; RI; SC; TN; TX; VA; WV
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AL; AR; CT; DE; FL; GA; KY; LA; MA; MD; MO; MS; NC; NJ; OK; PA; SC; TN; TX; VA; WV
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Discussion | Varieties 3 (3 in the flora). Eupatorium rotundifolium is one of the more variable species of the genus; its apparent propensity to hybridize with other species has led it to be described as a compilospecies and has complicated its delimitation. Hybrids with E. perfoliatum and E. sessilifolium are sufficiently distinctive to be treated here as distinctive entities (E. ×cordigerum and E. godfreyanum, respectively), and the varieties ovatum and scabridum have also been proposed to be of hybrid origin. The boundaries between varieties are indistinct and individual specimens may be difficult to place with confidence. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 21, p. 472. | FNA vol. 21, p. 466. | ||||||||
Parent taxa | Asteraceae > tribe Eupatorieae > Eupatorium | Asteraceae > tribe Eupatorieae > Eupatorium | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Artemisia capillifolia | |||||||||
Name authority | Linnaeus: Sp. Pl. 2: 837. (1753) | (Lamarck) Small: Mem. Torrey Bot. Club 5: 311. (1894) | ||||||||
Web links |