Vernonia lindheimeri |
Vernonia gigantea |
|
---|---|---|
woolly ironweed |
giant ironweed, tall ironweed |
|
Habit | Plants 2–5(–8+) dm. | Plants 8–20(–30+) dm. |
Stems | ± pannose. |
puberulent, glabrescent. |
Leaves | mostly cauline; blades linear, 5–8 cm × 2–4 mm, l/w = 17–25(–40), abaxially densely sericeo-tomentose, adaxially usually glabrate, sometimes sparsely arachno-tomentose. |
mostly cauline; blades ± lanceolate, 12–25+ cm × 20–60+ mm, l/w = (3.5–)4–7+, abaxially scabrellous (hairs awl-shaped), sometimes glabrescent, not or sparsely resin-gland-dotted, adaxially strigillose, glabrescent, not resin-gland-dotted. |
Peduncles | 5–35 mm. |
1–12(–20+) mm. |
Involucres | ± obconic to campanulate, 6–10 × 5–8 mm. |
broadly campanulate to hemispheric, 4–5+ × 4–5 mm. |
Florets | 12–24+. |
(9–)18–24(–30). |
Phyllaries | 40–50+ in 5–6+ series, sericeo-tomentose, including margins, the outer lance-ovate, 1–2 mm, the inner lanceolate to lance-linear, 6–7(–9+) mm, tips acute. |
30–40+ in 4–5 series, glabrate, margins ciliolate, the outer lance-ovate, 1–2 mm, inner oblong, 3.5–5 mm, tips acute or rounded-apiculate. |
Heads | in corymbiform arrays. |
in corymbiform-scorpioid arrays. |
Cypselae | 3–4 mm; pappi stramineous to purplish, outer scales 20+, 0.6–1.1 mm, contrasting with 20+, 6–7+ mm inner bristles. |
2.5–3.5 mm; pappi usually purplish, sometimes stramineous, outer scales 20–25, 0.5–1 mm, contrasting with 35–40+, 4.5–6+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia lindheimeri |
Vernonia gigantea |
|
Phenology | Flowering Jun–Aug. | Flowering Jun–Sep. |
Habitat | Calcareous soils, rocky banks | Flood plains |
Elevation | 300 m (1000 ft) | 10–300 m (0–1000 ft) |
Distribution |
AR; TX; Mexico (Coahuila)
|
AL; AR; FL; GA; IL; IN; KS; KY; LA; MD; MI; MO; MS; NC; NE; OH; OK; PA; SC; TN; TX; VA; WV; ON
|
Source | FNA vol. 19, p. 210. | FNA vol. 19, p. 212. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | Chrysocoma gigantea, V. altissima, V. altissima var. taeniotricha, V. gigantea subsp. ovalifolia, V. ovalifolia | |
Name authority | A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847) | (Walter) Branner & Coville: Rep. (Annual) Arkansas Geol. Surv. 4: 189. (1891) |
Web links |