Vernonia lindheimeri |
Vernonia texana |
|
---|---|---|
woolly ironweed |
Texas ironweed |
|
Habit | Plants 2–5(–8+) dm. | Plants 4–8(–10+) dm. |
Stems | ± pannose. |
puberulent, glabrescent. |
Leaves | mostly cauline; blades linear, 5–8 cm × 2–4 mm, l/w = 17–25(–40), abaxially densely sericeo-tomentose, adaxially usually glabrate, sometimes sparsely arachno-tomentose. |
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 | 5–35 mm. |
1–35 mm. |
Involucres | ± obconic to campanulate, 6–10 × 5–8 mm. |
± obconic to hemispheric, 4.5–6 × 5–7 mm. |
Florets | 12–24+. |
12–24+. |
Phyllaries | 40–50+ in 5–6+ series, sericeo-tomentose, including margins, the outer lance-ovate, 1–2 mm, the inner lanceolate to lance-linear, 6–7(–9+) mm, tips acute. |
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 arrays. |
in open, paniculiform-scorpioid arrays. |
Cypselae | 3–4 mm; pappi stramineous to purplish, outer scales 20+, 0.6–1.1 mm, contrasting with 20+, 6–7+ 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 lindheimeri |
Vernonia texana |
|
Phenology | Flowering Jun–Aug. | Flowering Jun–Aug. |
Habitat | Calcareous soils, rocky banks | Pinelands, scrub oak woodlands, sandy or sandy-clay soils |
Elevation | 300 m (1000 ft) | 60–200 m (200–700 ft) |
Distribution |
AR; TX; Mexico (Coahuila)
|
AR; LA; MS; OK; TX
|
Source | FNA vol. 19, p. 210. | FNA vol. 19, p. 211. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. angustifolia var. texana | |
Name authority | A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847) | (A. Gray) Small: Fl. S.E. U.S., 1338. (1903) |
Web links |