Vernonia acaulis |
Vernonia flaccidifolia |
|
---|---|---|
stemless ironweed |
Tennessee ironweed |
|
Habit | Plants 4–6(–10) dm. | Plants 10–20+ dm. |
Stems | ± puberulent, glabrescent. |
glabrous. |
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 ± lanceolate, 10–25(–30+) cm × 15–35(–60+) mm, l/w = 5–7+, abaxially puberulous, not resin-gland-dotted, adaxially scabrellous, glabrescent, not resin-gland-dotted. |
Peduncles | 5–50 mm. |
1–8(–15) mm. |
Involucres | campanulate to hemispheric, 5–10 × 6–7 mm. |
broadly campanulate to hemispheric, 4–5+ × 4–5 mm. |
Florets | 30–40(–55+). |
15–25+. |
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. |
30–45+ in 5–6 series, glabrescent, margins ciliolate, the outer lance-ovate, 1–3 mm, inner lance-oblong to oblong, 3.5–5 mm, tips rounded. |
Heads | in loose, corymbiform arrays. |
in paniculiform-scorpioid 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. |
3–3.5 mm; pappi stramineous to whitish, outer scales 25–35, 0.8–1.1 mm, contrasting with 35–45+, 5–6+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia acaulis |
Vernonia flaccidifolia |
|
Phenology | Flowering Jul–Aug. | Flowering Aug. |
Habitat | Open woods, pine savannas, bogs, disturbed places | Disturbed places in woodlands |
Elevation | 10–300 m (0–1000 ft) | 90–400 m (300–1300 ft) |
Distribution |
FL; GA; NC; SC
|
AL; GA; TN |
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: Bull. Torrey Bot. Club 25: 144. (1898) |
Web links |