Vernonia acaulis |
Vernonia angustifolia |
|
---|---|---|
stemless ironweed |
tall ironweed |
|
Habit | Plants 4–6(–10) dm. | Plants 5–10+ dm. |
Stems | ± puberulent, glabrescent. |
sparsely appressed-puberulent, glabrescent. |
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) lance-linear to filiform, 5–12 cm × 2–4(–8+) mm, l/w = (8–)12–30(–60+), abaxially glabrous but for scattered hairs on midribs or scabrellous (hairs awl-shaped), resin-gland-dotted or not, adaxially scabrellous. |
Peduncles | 5–50 mm. |
8–25 mm. |
Involucres | campanulate to hemispheric, 5–10 × 6–7 mm. |
± campanulate to obconic, 5–7(–10) × 4–6(–9) mm. |
Florets | 30–40(–55+). |
12–20(–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. |
22–45+ in 5–6 series, sparsely scabrellous, glabrescent, margins ciliolate, the outer lanceolate to subulate, 1.5–3 mm, inner lance-ovate to lanceolate, 5–9+ mm, tips acuminate to subulate. |
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. |
2.5–3 mm; pappi stramineous to purplish, outer scales 25–30, 0.5–1.2+ mm, contrasting with 35–40+, 5.5–6+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia acaulis |
Vernonia angustifolia |
|
Phenology | Flowering Jul–Aug. | Flowering Jun–Aug. |
Habitat | Open woods, pine savannas, bogs, disturbed places | Pine barrens, oak woodlands |
Elevation | 10–300 m (0–1000 ft) | 10–50 m (0–200 ft) |
Distribution |
FL; GA; NC; SC
|
AL; FL; GA; LA; MS; NC; 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 | V. angustifolia subsp. mohrii, V. angustifolia subsp. scaberrima, V. angustifolia var. scaberrima, V. scaberrima |
Name authority | (Walter) Gleason: Bull. New York Bot. Gard. 4: 222. (1906) | Michaux: Fl. Bor.-Amer. 2: 94. (1803) |
Web links |