Vernonia texana |
Vernonia angustifolia |
|
---|---|---|
Texas ironweed |
tall ironweed |
|
Habit | Plants 4–8(–10+) dm. | Plants 5–10+ dm. |
Stems | puberulent, glabrescent. |
sparsely appressed-puberulent, glabrescent. |
Leaves | basal and cauline; blades ovate-lanceolate (basal) to narrowly lanceolate (distal), 5–12+ cm × (5–)12–25+ mm, l/w = 3–5 (basal) or 8–17 (distal), abaxially glabrate (pitted, awl-shaped hairs in pits), adaxially puberulent and/or scabrellous. |
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 | 1–35 mm. |
8–25 mm. |
Involucres | ± obconic to hemispheric, 4.5–6 × 5–7 mm. |
± campanulate to obconic, 5–7(–10) × 4–6(–9) mm. |
Florets | 12–24+. |
12–20(–30). |
Phyllaries | 35–45+ in 5–6+ series, glabrescent, margins arachno-ciliolate, the outer lance-deltate, 1–32 mm, inner oblong to linear, 4–5(–6) 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 open, paniculiform-scorpioid arrays. |
in ± corymbiform to paniculiform arrays. |
Cypselae | 2–3 mm; pappi usually whitish to stramineous (rarely purplish), outer scales or bristles 20+, 0.3–1+ mm, contrasting or intergrading with 20+, 6–7+ mm inner subulate scales or 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 texana |
Vernonia angustifolia |
|
Phenology | Flowering Jun–Aug. | Flowering Jun–Aug. |
Habitat | Pinelands, scrub oak woodlands, sandy or sandy-clay soils | Pine barrens, oak woodlands |
Elevation | 60–200 m (200–700 ft) | 10–50 m (0–200 ft) |
Distribution |
AR; LA; MS; OK; TX
|
AL; FL; GA; LA; MS; NC; SC
|
Source | FNA vol. 19, p. 211. | FNA vol. 19, p. 209. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. angustifolia var. texana | V. angustifolia subsp. mohrii, V. angustifolia subsp. scaberrima, V. angustifolia var. scaberrima, V. scaberrima |
Name authority | (A. Gray) Small: Fl. S.E. U.S., 1338. (1903) | Michaux: Fl. Bor.-Amer. 2: 94. (1803) |
Web links |