Vernonia texana |
Vernonia baldwinii |
|
---|---|---|
Texas ironweed |
Baldwin's ironweed |
|
Habit | Plants 4–8(–10+) dm. | Plants 6–10(–15) dm. |
Stems | puberulent, glabrescent. |
puberulent to ± tomentose. |
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 elliptic to lance-ovate or lanceolate, 8–15(–18+) cm × 20–45(–75+) mm, l/w = 2–5, abaxially usually puberulent to tomentose or pannose (hairs ± erect, ± curled), seldom glabrate, resin-gland-dotted, adaxially scabrellous, glabrescent, not resin-gland-dotted. |
Peduncles | 1–35 mm. |
1–25 mm. |
Involucres | ± obconic to hemispheric, 4.5–6 × 5–7 mm. |
broadly campanulate to hemispheric, 4–6(–8+) × 4–7+ mm. |
Florets | 12–24+. |
(15–)20–25(–35+). |
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. |
45–65+ in 5–6 series, usually puberulent (often resin-gland-dotted distally), sometimes glabrescent, margins ciliolate, the outer lance-ovate, 1–2 mm, inner oblong to lanceolate, 5–8+ mm, tips rounded-apiculate to acute (sometimes recurved). |
Heads | in open, paniculiform-scorpioid arrays. |
in corymbiform-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. |
2.5–3 mm; pappi fuscous to purplish, outer scales 25–30, 0.2–1 mm, contrasting with 35–40+, 5–7+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia texana |
Vernonia baldwinii |
|
Phenology | Flowering Jun–Aug. | Flowering Jun–Nov. |
Habitat | Pinelands, scrub oak woodlands, sandy or sandy-clay soils | Disturbed places, grasslands, flood plains, forest margins, prairies |
Elevation | 60–200 m (200–700 ft) | 10–1100 m (0–3600 ft) |
Distribution |
AR; LA; MS; OK; TX
|
AR; CO; IA; IL; KS; KY; LA; MI; MO; NE; OK; TX
|
Discussion | Regarding Vernona baldwinii and V. interior, L. H. Shinners (1950) wrote, “The tips of the phyllaries vary from loosely appressed to squarrose, and from puberulent to almost completely glabrous on the inner face. The geographic distribution of the two extremes is nearly identical. I consider the two to be merely forms of one species.” I concur. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 19, p. 211. | FNA vol. 19, p. 213. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. angustifolia var. texana | V. baldwinii subsp. interior, V. baldwinii var. interior, V. interior |
Name authority | (A. Gray) Small: Fl. S.E. U.S., 1338. (1903) | Torrey: Ann. Lyceum Nat. Hist. New York 2: 211. (1827) |
Web links |