Vernonia baldwinii |
Vernonia marginata |
|
---|---|---|
Baldwin's ironweed |
ironplant, plains ironweed |
|
Habit | Plants 6–10(–15) dm. | Plants 3–5(–8+) dm. |
Stems | puberulent to ± tomentose. |
puberulent, glabrescent. |
Leaves | 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. |
mostly cauline; blades narrowly lanceolate to lance-linear, 5–15+ cm × (2.5–)8–12+ mm, l/w = 8–20(–30+), abaxially glabrate (pitted, awl-shaped hairs in pits), adaxially puberulent, glabrescent (sometimes pitted). |
Peduncles | 1–25 mm. |
(3–)10–35 mm. |
Involucres | broadly campanulate to hemispheric, 4–6(–8+) × 4–7+ mm. |
narrowly campanulate, (7–)9–11 × 5–6 mm. |
Florets | (15–)20–25(–35+). |
10–25+. |
Phyllaries | 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). |
35–40+ in 5–6+ series, glabrescent, margins arachno-ciliolate, the outer lance-ovate, 1–2 mm, inner oblong to linear-oblong, 6–9+ mm, tips ± acuminate. |
Heads | in corymbiform-scorpioid arrays. |
in corymbiform arrays. |
Cypselae | 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. |
4–5 mm; pappi stramineous to purplish, outer subulate scales or bristles 30+, 0.6–2+ mm, intergrading with 40+, 8–9+ mm inner subulate scales or bristles. |
2n | = 34. |
= 34. |
Vernonia baldwinii |
Vernonia marginata |
|
Phenology | Flowering Jun–Nov. | Flowering Jul–Aug. |
Habitat | Disturbed places, grasslands, flood plains, forest margins, prairies | Ditches, sandy flats, stream banks |
Elevation | 10–1100 m (0–3600 ft) | 600–2000 m (2000–6600 ft) |
Distribution |
AR; CO; IA; IL; KS; KY; LA; MI; MO; NE; OK; TX
|
CO; KS; NM; OK; TX; Mexico (Coahuila)
|
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. 213. | FNA vol. 19, p. 211. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. baldwinii subsp. interior, V. baldwinii var. interior, V. interior | V. altissima var. marginata |
Name authority | Torrey: Ann. Lyceum Nat. Hist. New York 2: 211. (1827) | (Torrey) Rafinesque: Atlantic J. 1: 146. (1832) |
Web links |