Vernonia texana |
Vernonia flaccidifolia |
|
---|---|---|
Texas ironweed |
Tennessee ironweed |
|
Habit | Plants 4–8(–10+) dm. | Plants 10–20+ dm. |
Stems | puberulent, glabrescent. |
glabrous. |
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 ± lanceolate, 10–25(–30+) cm × 15–35(–60+) mm, l/w = 5–7+, abaxially puberulous, not resin-gland-dotted, adaxially scabrellous, glabrescent, not resin-gland-dotted. |
Peduncles | 1–35 mm. |
1–8(–15) mm. |
Involucres | ± obconic to hemispheric, 4.5–6 × 5–7 mm. |
broadly campanulate to hemispheric, 4–5+ × 4–5 mm. |
Florets | 12–24+. |
15–25+. |
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. |
30–45+ in 5–6 series, glabrescent, margins ciliolate, the outer lance-ovate, 1–3 mm, inner lance-oblong to oblong, 3.5–5 mm, tips rounded. |
Heads | in open, paniculiform-scorpioid arrays. |
in paniculiform-scorpioid 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. |
3–3.5 mm; pappi stramineous to whitish, outer scales 25–35, 0.8–1.1 mm, contrasting with 35–45+, 5–6+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia texana |
Vernonia flaccidifolia |
|
Phenology | Flowering Jun–Aug. | Flowering Aug. |
Habitat | Pinelands, scrub oak woodlands, sandy or sandy-clay soils | Disturbed places in woodlands |
Elevation | 60–200 m (200–700 ft) | 90–400 m (300–1300 ft) |
Distribution |
AR; LA; MS; OK; TX
|
AL; GA; TN |
Source | FNA vol. 19, p. 211. | FNA vol. 19, p. 212. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. angustifolia var. texana | |
Name authority | (A. Gray) Small: Fl. S.E. U.S., 1338. (1903) | Small: Bull. Torrey Bot. Club 25: 144. (1898) |
Web links |