Vernonia lindheimeri |
Vernonia acaulis |
|
---|---|---|
woolly ironweed |
stemless ironweed |
|
Habit | Plants 2–5(–8+) dm. | Plants 4–6(–10) dm. |
Stems | ± pannose. |
± puberulent, 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 basal; blades oblong-elliptic to spatulate (basal, the distal narrower), 11–25(–30) cm × (21–)60–75+ mm, l/w = 2–4(–5+), abaxially usually glabrous or glabrate, sometimes hirsutulous on veins, usually resin-gland-dotted, adaxially ± scabrellous or glabrate. |
Peduncles | 5–35 mm. |
5–50 mm. |
Involucres | ± obconic to campanulate, 6–10 × 5–8 mm. |
campanulate to hemispheric, 5–10 × 6–7 mm. |
Florets | 12–24+. |
30–40(–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. |
40–60 in 5–6 series, glabrate, margins ciliolate, the outer lance-linear, 2–4 mm, inner lance-ovate to lance-subulate, 5–9 mm, tips subulate to filiform. |
Heads | in corymbiform arrays. |
in loose, 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. |
2.5–3+ mm; pappi whitish to stramineous, outer scales ca. 20, 0.6–1 mm, contrasting with 25–40, 5–7+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia lindheimeri |
Vernonia acaulis |
|
Phenology | Flowering Jun–Aug. | Flowering Jul–Aug. |
Habitat | Calcareous soils, rocky banks | Open woods, pine savannas, bogs, disturbed places |
Elevation | 300 m (1000 ft) | 10–300 m (0–1000 ft) |
Distribution |
AR; TX; Mexico (Coahuila)
|
FL; GA; NC; SC
|
Source | FNA vol. 19, p. 210. | FNA vol. 19, p. 208. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | Chrysocoma acaulis | |
Name authority | A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847) | (Walter) Gleason: Bull. New York Bot. Gard. 4: 222. (1906) |
Web links |