Vernonia lindheimeri |
Vernonia lettermannii |
|
---|---|---|
woolly ironweed |
narrowleaf ironweed, slimleaf ironweed |
|
Habit | Plants 2–5(–8+) dm. | Plants (2–)5–6+ dm. |
Stems | ± pannose. |
glabrous or glabrate. |
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 filiform, 5–9+ cm × 1–3+ mm, l/w = 25–50+, abaxially glabrate (pitted, awl-shaped hairs in pits), adaxially puberulent, glabrescent (sometimes pitted). |
Peduncles | 5–35 mm. |
6–20+ mm. |
Involucres | ± obconic to campanulate, 6–10 × 5–8 mm. |
narrowly campanulate, 7–9(–10+) × 4–5+ mm. |
Florets | 12–24+. |
10–12+. |
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 5–6+ series, sparsely tomentose, glabrescent, margins arachno-ciliolate, the outer lanceolate to subulate, 1–3 mm, inner oblong to lanceolate, 5–7+ mm, tips acute. |
Heads | in corymbiform arrays. |
in corymbiform 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. |
3–4 mm; pappi fuscous to purplish, outer scales 25+, 0.1–0.5 mm, contrasting with 35+, 6–7+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia lindheimeri |
Vernonia lettermannii |
|
Phenology | Flowering Jun–Aug. | Flowering Jul–Aug. |
Habitat | Calcareous soils, rocky banks | Flood plains, terraces |
Elevation | 300 m (1000 ft) | 100–200 m (300–700 ft) |
Distribution |
AR; TX; Mexico (Coahuila)
|
AR; OK
|
Source | FNA vol. 19, p. 210. | FNA vol. 19, p. 211. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Name authority | A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847) | Engelmann ex A. Gray: Notes Compositae, 78. (1880) |
Web links |