Vernonia acaulis |
Vernonia texana |
|
---|---|---|
stemless ironweed |
Texas ironweed |
|
Habit | Plants 4–6(–10) dm. | Plants 4–8(–10+) dm. |
Stems | ± puberulent, glabrescent. |
puberulent, glabrescent. |
Leaves | mostly basal; blades oblong-elliptic to spatulate (basal, the distal narrower), 11–25(–30) cm × (21–)60–75+ mm, l/w = 2–4(–5+), abaxially usually glabrous or glabrate, sometimes hirsutulous on veins, usually resin-gland-dotted, adaxially ± scabrellous or glabrate. |
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 | 5–50 mm. |
1–35 mm. |
Involucres | campanulate to hemispheric, 5–10 × 6–7 mm. |
± obconic to hemispheric, 4.5–6 × 5–7 mm. |
Florets | 30–40(–55+). |
12–24+. |
Phyllaries | 40–60 in 5–6 series, glabrate, margins ciliolate, the outer lance-linear, 2–4 mm, inner lance-ovate to lance-subulate, 5–9 mm, tips subulate to 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 loose, corymbiform arrays. |
in open, paniculiform-scorpioid arrays. |
Cypselae | 2.5–3+ mm; pappi whitish to stramineous, outer scales ca. 20, 0.6–1 mm, contrasting with 25–40, 5–7+ mm inner 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 acaulis |
Vernonia texana |
|
Phenology | Flowering Jul–Aug. | Flowering Jun–Aug. |
Habitat | Open woods, pine savannas, bogs, disturbed places | Pinelands, scrub oak woodlands, sandy or sandy-clay soils |
Elevation | 10–300 m (0–1000 ft) | 60–200 m (200–700 ft) |
Distribution |
FL; GA; NC; SC
|
AR; LA; MS; OK; TX
|
Source | FNA vol. 19, p. 208. | FNA vol. 19, p. 211. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | Chrysocoma acaulis | V. angustifolia var. texana |
Name authority | (Walter) Gleason: Bull. New York Bot. Gard. 4: 222. (1906) | (A. Gray) Small: Fl. S.E. U.S., 1338. (1903) |
Web links |