Vernonia lindheimeri |
Vernonia missurica |
|
---|---|---|
woolly ironweed |
Missouri ironweed |
|
Habit | Plants 2–5(–8+) dm. | Plants 6–12(–20+) dm. |
Stems | ± pannose. |
puberulent. |
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 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 | 5–35 mm. |
3–35 mm. |
Involucres | ± obconic to campanulate, 6–10 × 5–8 mm. |
broadly campanulate to urceolate, (6–)7–10+ × 5–9+ mm. |
Florets | 12–24+. |
30–55+. |
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. |
50–70+ 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 | 3–4 mm; pappi stramineous to purplish, outer scales 20+, 0.6–1.1 mm, contrasting with 20+, 6–7+ 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 lindheimeri |
Vernonia missurica |
|
Phenology | Flowering Jun–Aug. | Flowering Jul–Sep. |
Habitat | Calcareous soils, rocky banks | Prairies, loamy to sandy soils |
Elevation | 300 m (1000 ft) | 30–200 m (100–700 ft) |
Distribution |
AR; TX; Mexico (Coahuila)
|
AL; AR; GA; IA; IL; IN; KS; KY; LA; MI; MO; MS; OK; TN; TX
|
Source | FNA vol. 19, p. 210. | FNA vol. 19, p. 212. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Name authority | A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847) | Rafinesque: Herb. Raf., 28. (1833) |
Web links |