Vernonia texana |
Vernonia fasciculata |
|
---|---|---|
Texas ironweed |
prairie ironweed, smooth ironweed, western ironweed |
|
Habit | Plants 4–8(–10+) dm. | Plants 3–12+ dm. |
Stems | puberulent, glabrescent. |
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 ± lanceolate, 5–12(–20+) cm × 5–18(–40+) mm, l/w = 5–9(–14+), abaxially glabrate (pitted, with awl-shaped hairs in pits), adaxially scabrellous, resin-gland-dotted (sometimes pitted). |
Peduncles | 1–35 mm. |
1–8(–12+) mm. |
Involucres | ± obconic to hemispheric, 4.5–6 × 5–7 mm. |
± campanulate, 5–7(–8+) × 4–6 mm. |
Florets | 12–24+. |
12–25+. |
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. |
25–35+ in 4–5+ series, glabrescent, margins arachno-ciliolate, the outer lance-ovate, 1–3 mm, inner oblong to linear-oblong, 5–7+ mm, tips acute or rounded-apiculate. |
Heads | in open, paniculiform-scorpioid arrays. |
in congested, corymbiform 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. |
3.5–4 mm; pappi fuscous to purplish, outer subulate scales or bristles 20–30, 0.5–3+ mm, intergrading with 35–45+, 5–7+ mm inner subulate scales or bristles. |
2n | = 34. |
= 34. |
Vernonia texana |
Vernonia fasciculata |
|
Phenology | Flowering Jun–Aug. | Flowering Jul–Sep. |
Habitat | Pinelands, scrub oak woodlands, sandy or sandy-clay soils | Bottomlands, ditches, low prairies |
Elevation | 60–200 m (200–700 ft) | 100–1200 m (300–3900 ft) |
Distribution |
AR; LA; MS; OK; TX
|
CO; IA; IL; IN; KS; KY; MA; MN; MO; ND; NE; OH; OK; SD; WI; MB
|
Source | FNA vol. 19, p. 211. | FNA vol. 19, p. 211. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. angustifolia var. texana | V. fasciculata subsp. corymbosa, V. fasciculata var. corymbosa |
Name authority | (A. Gray) Small: Fl. S.E. U.S., 1338. (1903) | Michaux: Fl. Bor.-Amer. 2: 94. (1803) |
Web links |