Vernonia acaulis |
Vernonia larseniae |
|
---|---|---|
stemless ironweed |
Larsen's ironweed |
|
Habit | Plants 4–6(–10) dm. | Plants 7–10+ dm. |
Stems | ± puberulent, glabrescent. |
tomentose to pannose. |
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 linear, 5–9(–12+) cm × 3–5(–8+) mm, l/w = 16–32, abaxially tomentose, adaxially densely sericeo-tomentose. |
Peduncles | 5–50 mm. |
10–60 mm. |
Involucres | campanulate to hemispheric, 5–10 × 6–7 mm. |
± hemispheric, 8–12 × 7–12 mm. |
Florets | 30–40(–55+). |
40–50+. |
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. |
50–60+ in 5–6+ series, sericeo-tomentose to pannose, including margins, the outer lance-deltate, 1–3 mm, the inner lanceolate, 7–11+ mm, tips acute. |
Heads | in loose, corymbiform arrays. |
in corymbiform 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 stramineous, outer subulate scales or bristles 20+, 0.6–1.5+ mm, intergrading with 30+, 6–7+ mm inner subulate scales or bristles. |
2n | = 34. |
= 34. |
Vernonia acaulis |
Vernonia larseniae |
|
Phenology | Flowering Jul–Aug. | Flowering Jun. |
Habitat | Open woods, pine savannas, bogs, disturbed places | Arroyos, on limestone |
Elevation | 10–300 m (0–1000 ft) | 800–900 m (2600–3000 ft) |
Distribution |
FL; GA; NC; SC
|
TX; Mexico (Coahuila) |
Source | FNA vol. 19, p. 208. | FNA vol. 19, p. 210. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | Chrysocoma acaulis | V. lindheimeri var. leucophylla |
Name authority | (Walter) Gleason: Bull. New York Bot. Gard. 4: 222. (1906) | B. L. King & S. B. Jones: Brittonia 27: 84. (1975) |
Web links |