Vernonia fasciculata |
Vernonia baldwinii |
|
---|---|---|
prairie ironweed, smooth ironweed, western ironweed |
Baldwin's ironweed |
|
Habit | Plants 3–12+ dm. | Plants 6–10(–15) dm. |
Stems | puberulent, glabrescent. |
puberulent to ± tomentose. |
Leaves | 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). |
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 | 1–8(–12+) mm. |
1–25 mm. |
Involucres | ± campanulate, 5–7(–8+) × 4–6 mm. |
broadly campanulate to hemispheric, 4–6(–8+) × 4–7+ mm. |
Florets | 12–25+. |
(15–)20–25(–35+). |
Phyllaries | 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. |
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 congested, corymbiform arrays. |
in corymbiform-scorpioid arrays. |
Cypselae | 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. |
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 fasciculata |
Vernonia baldwinii |
|
Phenology | Flowering Jul–Sep. | Flowering Jun–Nov. |
Habitat | Bottomlands, ditches, low prairies | Disturbed places, grasslands, flood plains, forest margins, prairies |
Elevation | 100–1200 m (300–3900 ft) | 10–1100 m (0–3600 ft) |
Distribution |
CO; IA; IL; IN; KS; KY; MA; MN; MO; ND; NE; OH; OK; SD; WI; MB
|
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. fasciculata subsp. corymbosa, V. fasciculata var. corymbosa | V. baldwinii subsp. interior, V. baldwinii var. interior, V. interior |
Name authority | Michaux: Fl. Bor.-Amer. 2: 94. (1803) | Torrey: Ann. Lyceum Nat. Hist. New York 2: 211. (1827) |
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