Eutrochium dubium

 

 

학명 : Eutrochium dubium (Willdenow ex Poiret) E. E. Lamont

학명 이명 : Eupatorium dubium Willd. ex Poiret

* 우리나라에는 Eupatorium dubium Willd. ex Poiret로 소개되어 있다

 

아래 사진의 것은 품종 'Baby Joe'이다

 

사진 : 2021.10.07 서울식물원

 

 

 

 

아래 : 2021.10.22 서울식물원

 

 

아래 : 2022.07.23 서울식물원

 

 

 

 

 

FNA 설명

 

Eutrochium dubium (Willdenow ex Poiret) E. E. Lamont, Sida. 21: 901. 2004.

 

Common name : Coastal plain joepyeweed, joepye thoroughwort

(학명 이명)

Eupatorium dubium Willdenow ex Poiret in J. Lamarck et al., Encycl., suppl. 2: 606. 1812; Eupatoriadelphus dubius (Willdenow ex Poiret) R. M. King & H. Robinson; Eupatorium americanum Hill; E. ternifolium Elliott

(설명)

Plants 40–120(–170) cm. Stems usually purple-spotted, sometimes uniformly purple, solid, glabrous proximally, glandular-puberulent distally. Leaves mostly in 3s–4s; petioles 7–25 mm, glabrous; blades usually ± 3-nerved, rarely pinnately veined, deltate-ovate or ovate to lance-ovate, 5–16 × 2–8 cm, relatively thick and firm (often rugose), bases usually abruptly contracted to petioles, margins coarsely serrate, abaxial faces densely gland-dotted and sparingly hirsute (at least on midribs and main veins), adaxial faces scabrous, glabrescent. Heads usually in ± convex, sometimes flat-topped, corymbiform arrays. Involucres often purplish, 6.5–9 × 2.5–5 mm. Phyllaries glabrous or sparsely hairy. Florets (4–)5–9(–10); corollas usually dark purple, rarely pinkish or white, 4.5–7 mm. Cypselae 3–4.5 mm. 2n = 20.

 

Flowering late summer–early fall. Moist habitats, in sandy or gravelly, acid soils, open sun or partial shade; 0–50+ m; N.S.; Conn., Del., Maine, Md., Mass., N.H., N.J., N.Y., N.C., Pa., R.I., S.C., Vt., Va.

 

Eutrochium dubium is restricted to the coastal plain, and inland along major river systems, of eastern North America. Identification of E. dubium has been difficult for field botanists, as evidenced by misidentified herbarium specimens. The most prominent character distinguishing E. dubium from its relatives (especially E. maculatum) is the 3-nerved leaf venation: the proximalmost pair of lateral veins are more prominent and more prolonged than the others. This character is best observed on abaxial leaf faces.