Vernonia arkansana |
Vernonia missurica |
|
---|---|---|
Arkansas ironweed, great ironweed |
Missouri ironweed |
|
Habit | Plants 8–12(–20) dm. | Plants 6–12(–20+) dm. |
Stems | scabrellous to pilosulous, glabrescent. |
puberulent. |
Leaves | mostly cauline; blades lance-linear, 6–14(–20) cm × 7–15(–25) mm, l/w = 7–10(–18), abaxially scabrellous (hairs awl-shaped), resin-gland-dotted, adaxially scaberulous, glabrescent, resin-gland-dotted. |
mostly cauline; blades elliptic to lance-ovate or lanceolate, 6–16(–20+) cm × 18–48+ mm, l/w = 2.5–4(–6+), abaxially usually puberulent to tomentose or pannose (hairs ± erect, ± curled), seldom glabrate, resin-gland-dotted, adaxially scabrellous, glabrescent, not resin-gland-dotted. |
Peduncles | 2–5 cm. |
3–35 mm. |
Involucres | ± hemispheric, 11–15 × 11–15 mm. |
broadly campanulate to urceolate, (6–)7–10+ × 5–9+ mm. |
Florets | 50–100+. |
30–55+. |
Phyllaries | (50–)60–70+ in 5–6 series, scabrellous (and resin-gland-dotted), margins ciliolate, the outer lance-ovate, 3–8+ mm, inner lanceolate, 12–15 mm, tips subulate to filiform. |
50–70+ in 6–7 series, sparsely scabrellous, glabrescent (seldom resin-gland-dotted), margins ciliolate, the outer lanceolate, 1–2 mm, inner linear-oblong to oblong, 6–7(–9+) mm, tips acute or rounded-apiculate. |
Heads | in ± corymbiform arrays. |
in corymbiform-scorpioid arrays. |
Cypselae | 3–5 mm; pappi fuscous to purplish, outer scales 25–30+, 0.5–1 mm, contrasting with 25–30+, 5–7 mm inner bristles. |
3.5–4; pappi stramineous to whitish, outer scales 25–30, 0.5–1.1 mm, contrasting with 35–40+, 6–8+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia arkansana |
Vernonia missurica |
|
Phenology | Flowering Aug–Oct. | Flowering Jul–Sep. |
Habitat | Leas, roadsides, stream banks, in sand or on limestone | Prairies, loamy to sandy soils |
Elevation | 200–300 m (700–1000 ft) | 30–200 m (100–700 ft) |
Distribution |
AR; KS; MO; OK
|
AL; AR; GA; IA; IL; IN; KS; KY; LA; MI; MO; MS; OK; TN; TX
|
Discussion | Vernonia arkansana was published in April, V. crinita in October 1838. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 19, p. 208. | FNA vol. 19, p. 212. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. crinita | |
Name authority | de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 264. (1838) | Rafinesque: Herb. Raf., 28. (1833) |
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