Vernonia missurica |
Vernonia lettermannii |
|
---|---|---|
Missouri ironweed |
narrowleaf ironweed, slimleaf ironweed |
|
Habit | Plants 6–12(–20+) dm. | Plants (2–)5–6+ dm. |
Stems | puberulent. |
glabrous or glabrate. |
Leaves | mostly cauline; blades elliptic to lance-ovate or lanceolate, 6–16(–20+) cm × 18–48+ mm, l/w = 2.5–4(–6+), abaxially usually puberulent to tomentose or pannose (hairs ± erect, ± curled), seldom glabrate, resin-gland-dotted, adaxially scabrellous, glabrescent, not resin-gland-dotted. |
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 | 3–35 mm. |
6–20+ mm. |
Involucres | broadly campanulate to urceolate, (6–)7–10+ × 5–9+ mm. |
narrowly campanulate, 7–9(–10+) × 4–5+ mm. |
Florets | 30–55+. |
10–12+. |
Phyllaries | 50–70+ in 6–7 series, sparsely scabrellous, glabrescent (seldom resin-gland-dotted), margins ciliolate, the outer lanceolate, 1–2 mm, inner linear-oblong to oblong, 6–7(–9+) mm, tips acute or rounded-apiculate. |
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-scorpioid arrays. |
in corymbiform arrays. |
Cypselae | 3.5–4; pappi stramineous to whitish, outer scales 25–30, 0.5–1.1 mm, contrasting with 35–40+, 6–8+ 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 missurica |
Vernonia lettermannii |
|
Phenology | Flowering Jul–Sep. | Flowering Jul–Aug. |
Habitat | Prairies, loamy to sandy soils | Flood plains, terraces |
Elevation | 30–200 m (100–700 ft) | 100–200 m (300–700 ft) |
Distribution |
AL; AR; GA; IA; IL; IN; KS; KY; LA; MI; MO; MS; OK; TN; TX
|
AR; OK
|
Source | FNA vol. 19, p. 212. | FNA vol. 19, p. 211. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Name authority | Rafinesque: Herb. Raf., 28. (1833) | Engelmann ex A. Gray: Notes Compositae, 78. (1880) |
Web links |