Vernonia acaulis |
Vernonia blodgettii |
|
---|---|---|
stemless ironweed |
Florida ironweed |
|
Habit | Plants 4–6(–10) dm. | Plants 2–3(–5+) dm. |
Stems | ± puberulent, glabrescent. |
glabrous or glabrate. |
Leaves | 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. |
mostly cauline; blades lance-linear to linear, 3–7+ cm × 2–8+ mm, l/w = 7–15+, abaxially scabrellous (hairs appressed, awl-shaped), resin-gland-dotted, adaxially scabrellous, glabrescent, resin-gland-dotted. |
Peduncles | 5–50 mm. |
12–35 mm. |
Involucres | campanulate to hemispheric, 5–10 × 6–7 mm. |
campanulate to obconic, 6–8 × 6–10 mm. |
Florets | 30–40(–55+). |
18–25+. |
Phyllaries | 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. |
30–40+ in 4–5 series, puberulent, margins arachno-ciliate, the outer lance-ovate, 2–3 mm, inner lance-oblong to linear-oblong, 6–7 mm, tips acute or rounded-apiculate. |
Heads | in loose, corymbiform arrays. |
in open, corymbiform to paniculiform arrays. |
Cypselae | 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. |
2.5–3+ mm; pappi stramineous to whitish, outer scales 25–30, 0.5–1.1 mm, contrasting with 30–40+, 5–7+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia acaulis |
Vernonia blodgettii |
|
Phenology | Flowering Jul–Aug. | Flowering year-round. |
Habitat | Open woods, pine savannas, bogs, disturbed places | Damp, peaty or sandy soils |
Elevation | 10–300 m (0–1000 ft) | 0–10 m (0–0 ft) |
Distribution |
FL; GA; NC; SC
|
FL; West Indies (Bahamas) |
Source | FNA vol. 19, p. 208. | FNA vol. 19, p. 212. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | Chrysocoma acaulis | |
Name authority | (Walter) Gleason: Bull. New York Bot. Gard. 4: 222. (1906) | Small: Fl. S.E. U.S., 1160, 1338. (1903) |
Web links |