Vernonia lindheimeri |
Vernonia arkansana |
|
---|---|---|
woolly ironweed |
Arkansas ironweed, great ironweed |
|
Habit | Plants 2–5(–8+) dm. | Plants 8–12(–20) dm. |
Stems | ± pannose. |
scabrellous to pilosulous, glabrescent. |
Leaves | mostly cauline; blades linear, 5–8 cm × 2–4 mm, l/w = 17–25(–40), abaxially densely sericeo-tomentose, adaxially usually glabrate, sometimes sparsely arachno-tomentose. |
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. |
Peduncles | 5–35 mm. |
2–5 cm. |
Involucres | ± obconic to campanulate, 6–10 × 5–8 mm. |
± hemispheric, 11–15 × 11–15 mm. |
Florets | 12–24+. |
50–100+. |
Phyllaries | 40–50+ in 5–6+ series, sericeo-tomentose, including margins, the outer lance-ovate, 1–2 mm, the inner lanceolate to lance-linear, 6–7(–9+) mm, tips acute. |
(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. |
Heads | in corymbiform arrays. |
in ± corymbiform arrays. |
Cypselae | 3–4 mm; pappi stramineous to purplish, outer scales 20+, 0.6–1.1 mm, contrasting with 20+, 6–7+ mm inner bristles. |
3–5 mm; pappi fuscous to purplish, outer scales 25–30+, 0.5–1 mm, contrasting with 25–30+, 5–7 mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia lindheimeri |
Vernonia arkansana |
|
Phenology | Flowering Jun–Aug. | Flowering Aug–Oct. |
Habitat | Calcareous soils, rocky banks | Leas, roadsides, stream banks, in sand or on limestone |
Elevation | 300 m (1000 ft) | 200–300 m (700–1000 ft) |
Distribution |
AR; TX; Mexico (Coahuila)
|
AR; KS; MO; OK
|
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. 210. | FNA vol. 19, p. 208. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. crinita | |
Name authority | A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847) | de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 264. (1838) |
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