Vernonia acaulis |
Vernonia pulchella |
|
---|---|---|
stemless ironweed |
Georgia ironweed |
|
Habit | Plants 4–6(–10) dm. | Plants 4–7+ dm. |
Stems | ± puberulent, glabrescent. |
sparsely appressed-puberulent. |
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 (mid stem) mostly oblanceolate to lance-linear, rarely ovate, 3–7 cm × (5–)10–20+ mm, l/w = (2.5–)3.5–6+ (bases rounded-truncate), abaxially scabrellous (hairs awl-shaped), resin-gland-dotted, adaxially scabrellous. |
Peduncles | 5–50 mm. |
5–35 mm. |
Involucres | campanulate to hemispheric, 5–10 × 6–7 mm. |
± campanulate, 6–11 × 5–9 mm. |
Florets | 30–40(–55+). |
14–25(–30+). |
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. |
40–50+ in 5–6 series, sparsely puberulent, margins arachno-ciliate, the outer subulate to filiform, 3–7 mm, inner lance-attenuate to filiform, 9–10+ mm, tips subulate to filiform. |
Heads | in loose, corymbiform arrays. |
in ± 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. |
3–3.5 mm; pappi stramineous, outer scales 25–30, 0.6–1.1 mm, contrasting with 30+, 6–7+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia acaulis |
Vernonia pulchella |
|
Phenology | Flowering Jul–Aug. | Flowering Jul–Sep. |
Habitat | Open woods, pine savannas, bogs, disturbed places | Low, wet places in pine woods |
Elevation | 10–300 m (0–1000 ft) | 20–50 m (100–200 ft) |
Distribution |
FL; GA; NC; SC
|
GA; SC |
Source | FNA vol. 19, p. 208. | FNA vol. 19, p. 209. |
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: 145. (1898) |
Web links |