Vernonia missurica |
Vernonia marginata |
|
---|---|---|
Missouri ironweed |
ironplant, plains ironweed |
|
Habit | Plants 6–12(–20+) dm. | Plants 3–5(–8+) dm. |
Stems | puberulent. |
puberulent, glabrescent. |
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 narrowly lanceolate to lance-linear, 5–15+ cm × (2.5–)8–12+ mm, l/w = 8–20(–30+), abaxially glabrate (pitted, awl-shaped hairs in pits), adaxially puberulent, glabrescent (sometimes pitted). |
Peduncles | 3–35 mm. |
(3–)10–35 mm. |
Involucres | broadly campanulate to urceolate, (6–)7–10+ × 5–9+ mm. |
narrowly campanulate, (7–)9–11 × 5–6 mm. |
Florets | 30–55+. |
10–25+. |
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. |
35–40+ in 5–6+ series, glabrescent, margins arachno-ciliolate, the outer lance-ovate, 1–2 mm, inner oblong to linear-oblong, 6–9+ mm, tips ± acuminate. |
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. |
4–5 mm; pappi stramineous to purplish, outer subulate scales or bristles 30+, 0.6–2+ mm, intergrading with 40+, 8–9+ mm inner subulate scales or bristles. |
2n | = 34. |
= 34. |
Vernonia missurica |
Vernonia marginata |
|
Phenology | Flowering Jul–Sep. | Flowering Jul–Aug. |
Habitat | Prairies, loamy to sandy soils | Ditches, sandy flats, stream banks |
Elevation | 30–200 m (100–700 ft) | 600–2000 m (2000–6600 ft) |
Distribution |
AL; AR; GA; IA; IL; IN; KS; KY; LA; MI; MO; MS; OK; TN; TX
|
CO; KS; NM; OK; TX; Mexico (Coahuila)
|
Source | FNA vol. 19, p. 212. | FNA vol. 19, p. 211. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. altissima var. marginata | |
Name authority | Rafinesque: Herb. Raf., 28. (1833) | (Torrey) Rafinesque: Atlantic J. 1: 146. (1832) |
Web links |