Vernonia glauca |
Vernonia texana |
|
---|---|---|
Appalachian ironweed, broad-leaf ironweed |
Texas ironweed |
|
Habit | Plants 6–10+ dm. | Plants 4–8(–10+) dm. |
Stems | sparsely appressed-puberulent, glabrescent. |
puberulent, glabrescent. |
Leaves | mostly cauline; blades lanceolate to oblanceolate, 10–15(–18+) cm × 30–45(–70+) mm, l/w = 2.5–3.5(–4), abaxially scabrellous (hairs awl-shaped), resin-gland-dotted or not, adaxially glabrous or sparsely puberulent. |
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. |
Peduncles | 2–35 mm. |
1–35 mm. |
Involucres | ± hemispheric, 5–8 × 7–8 mm. |
± obconic to hemispheric, 4.5–6 × 5–7 mm. |
Florets | 30–45+. |
12–24+. |
Phyllaries | 40–60 in 5–6 series, sparsely puberulent to tomentulose, glabrescent, margins ciliolate, the outer lance-deltate to subulate, 1–3 mm, inner oblong, 4–7+ mm, tips acuminate to subulate or filiform. |
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. |
Heads | in corymbiform to paniculiform arrays. |
in open, paniculiform-scorpioid arrays. |
Cypselae | 3–4 mm; pappi stramineous to whitish, outer subulate scales or bristles 30, 0.5–1.5+ mm, intergrading with 30+, 6–8 mm inner subulate scales or bristles. |
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. |
2n | = 34. |
= 34. |
Vernonia glauca |
Vernonia texana |
|
Phenology | Flowering Jul–Sep. | Flowering Jun–Aug. |
Habitat | Dry fields, marshes | Pinelands, scrub oak woodlands, sandy or sandy-clay soils |
Elevation | 10–400 m (0–1300 ft) | 60–200 m (200–700 ft) |
Distribution |
AL; DC; DE; GA; MA; MD; NC; NJ; PA; SC; VA
|
AR; LA; MS; OK; TX
|
Source | FNA vol. 19, p. 209. | FNA vol. 19, p. 211. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | Serratula glauca | V. angustifolia var. texana |
Name authority | (Linnaeus) Willdenow: Sp. Pl. 3: 1633. (1803) | (A. Gray) Small: Fl. S.E. U.S., 1338. (1903) |
Web links |