Class
Order
Family
Genus
Classification
Nomenclature
Scientific Name:
Erechtites hieraciifolius (L.) Raf. ex DC., Prodr. [A. P. de Candolle] 6, 294 (1838) – as hieraciifolia
Synonymy:
- ≡ Senecio hieraciifolius L., Sp. Pl. 866 (1753)
Vernacular Name(s):
American fireweed
Description
Erect annual herb, up to c. 2 m tall. Stems sparsely hairy to glabrous, branched above. Lvs glabrous or sparsely hairy on veins below, apetiolate, lanceolate, oblanceolate or narrow-elliptic, cuneate and sometimes amplexicaul, or broad at base, irregularly serrate or with triangular lobes and again serrate, 6–20 × 1–8 cm; uppermost lvs smaller, often lanceolate or linear. Capitula in dense or open panicles. Supplementary bracts 5–14, linear, 3–5 mm long. Involucral bracts 12–15, linear, (8)–11–13 mm long. Disc pale yellow, 5–8 mm diam. Achenes subcylindric, narrowed to apex, 2.5–3.5 mm long, sparsely hairy between ribs; pappus white, 12–15 mm long.
[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]
Biostatus
Exotic
Phenology
Flowering: Jan.–Apr.
Bibliography
de Candolle, A.P. 1838 ("1837"): Prodromus Systematis Naturalis Regni Vegetabilis. Vol. 6. Treuttel et Würtz, Paris.
Linnaeus, C. 1753: Species Plantarum. Impensis Laurentii Salvii, Stockholm.
