Vernonia lindheimeri |
Vernonia flaccidifolia |
|
---|---|---|
woolly ironweed |
Tennessee ironweed |
|
Habit | Plants 2–5(–8+) dm. | Plants 10–20+ dm. |
Stems | ± pannose. |
glabrous. |
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, 10–25(–30+) cm × 15–35(–60+) mm, l/w = 5–7+, abaxially puberulous, not resin-gland-dotted, adaxially scabrellous, glabrescent, not resin-gland-dotted. |
Peduncles | 5–35 mm. |
1–8(–15) mm. |
Involucres | ± obconic to campanulate, 6–10 × 5–8 mm. |
broadly campanulate to hemispheric, 4–5+ × 4–5 mm. |
Florets | 12–24+. |
15–25+. |
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. |
30–45+ in 5–6 series, glabrescent, margins ciliolate, the outer lance-ovate, 1–3 mm, inner lance-oblong to oblong, 3.5–5 mm, tips rounded. |
Heads | in corymbiform arrays. |
in paniculiform-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. |
3–3.5 mm; pappi stramineous to whitish, outer scales 25–35, 0.8–1.1 mm, contrasting with 35–45+, 5–6+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia lindheimeri |
Vernonia flaccidifolia |
|
Phenology | Flowering Jun–Aug. | Flowering Aug. |
Habitat | Calcareous soils, rocky banks | Disturbed places in woodlands |
Elevation | 300 m (1000 ft) | 90–400 m (300–1300 ft) |
Distribution |
AR; TX; Mexico (Coahuila)
|
AL; GA; TN |
Source | FNA vol. 19, p. 210. | FNA vol. 19, p. 212. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Name authority | A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847) | Small: Bull. Torrey Bot. Club 25: 144. (1898) |
Web links |