Vernonia acaulis |
Vernonia noveboracensis |
|
---|---|---|
stemless ironweed |
New York ironweed |
|
Habit | Plants 4–6(–10) dm. | Plants 8–12(–20) dm. |
Stems | ± puberulent, glabrescent. |
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 ± lanceolate, 9–15(–25+) cm × 15–45(–60+) mm, l/w = (3.3–)4–6+, abaxially scabrellous, tomentose, or pannose, resin-gland-dotted, adaxially scabrellous, often resin-gland-dotted. |
Peduncles | 5–50 mm. |
2–35 mm. |
Involucres | campanulate to hemispheric, 5–10 × 6–7 mm. |
± hemispheric, 6–10 × 7–10 mm. |
Florets | 30–40(–55+). |
30–45(–65). |
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. |
35–60+ in 4–6+ series, sparsely tomentulose, glabrescent, margins ciliolate, the outer lanceolate to subulate, 1–3 mm, inner oblong, 7–9+ 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. |
3.5–4+ mm; pappi fuscous to purplish, outer scales 20, 0.2–0.6+ mm, contrasting with 30–40+, 5–7+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia acaulis |
Vernonia noveboracensis |
|
Phenology | Flowering Jul–Aug. | Flowering Aug–Oct. |
Habitat | Open woods, pine savannas, bogs, disturbed places | Abandoned fields, marshes, roadsides |
Elevation | 10–300 m (0–1000 ft) | 10–600 m (0–2000 ft) |
Distribution |
FL; GA; NC; SC
|
AL; CT; DC; DE; FL; GA; MA; MD; NC; NJ; NY; PA; RI; SC; TN; VA; WV
|
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 | Serratula noveboracensis, V. harperi, V. noveboracensis var. tomentosa |
Name authority | (Walter) Gleason: Bull. New York Bot. Gard. 4: 222. (1906) | (Linnaeus) Michaux: Fl. Bor.-Amer. 2: 95. (1803) |
Web links |