Vernonia missurica |
Vernonia angustifolia |
|
---|---|---|
Missouri ironweed |
tall ironweed |
|
Habit | Plants 6–12(–20+) dm. | Plants 5–10+ dm. |
Stems | puberulent. |
sparsely appressed-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 (mid stem) lance-linear to filiform, 5–12 cm × 2–4(–8+) mm, l/w = (8–)12–30(–60+), abaxially glabrous but for scattered hairs on midribs or scabrellous (hairs awl-shaped), resin-gland-dotted or not, adaxially scabrellous. |
Peduncles | 3–35 mm. |
8–25 mm. |
Involucres | broadly campanulate to urceolate, (6–)7–10+ × 5–9+ mm. |
± campanulate to obconic, 5–7(–10) × 4–6(–9) mm. |
Florets | 30–55+. |
12–20(–30). |
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. |
22–45+ in 5–6 series, sparsely scabrellous, glabrescent, margins ciliolate, the outer lanceolate to subulate, 1.5–3 mm, inner lance-ovate to lanceolate, 5–9+ mm, tips acuminate to subulate. |
Heads | in corymbiform-scorpioid arrays. |
in ± corymbiform to paniculiform 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. |
2.5–3 mm; pappi stramineous to purplish, outer scales 25–30, 0.5–1.2+ mm, contrasting with 35–40+, 5.5–6+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia missurica |
Vernonia angustifolia |
|
Phenology | Flowering Jul–Sep. | Flowering Jun–Aug. |
Habitat | Prairies, loamy to sandy soils | Pine barrens, oak woodlands |
Elevation | 30–200 m (100–700 ft) | 10–50 m (0–200 ft) |
Distribution |
AL; AR; GA; IA; IL; IN; KS; KY; LA; MI; MO; MS; OK; TN; TX
|
AL; FL; GA; LA; MS; NC; SC
|
Source | FNA vol. 19, p. 212. | FNA vol. 19, p. 209. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. angustifolia subsp. mohrii, V. angustifolia subsp. scaberrima, V. angustifolia var. scaberrima, V. scaberrima | |
Name authority | Rafinesque: Herb. Raf., 28. (1833) | Michaux: Fl. Bor.-Amer. 2: 94. (1803) |
Web links |