Vernonia lindheimeri |
Vernonia larseniae |
|
---|---|---|
woolly ironweed |
Larsen's ironweed |
|
Habit | Plants 2–5(–8+) dm. | Plants 7–10+ dm. |
Stems | ± pannose. |
tomentose to pannose. |
Leaves | mostly cauline; blades linear, 5–8 cm × 2–4 mm, l/w = 17–25(–40), abaxially densely sericeo-tomentose, adaxially usually glabrate, sometimes sparsely arachno-tomentose. |
mostly cauline; blades linear, 5–9(–12+) cm × 3–5(–8+) mm, l/w = 16–32, abaxially tomentose, adaxially densely sericeo-tomentose. |
Peduncles | 5–35 mm. |
10–60 mm. |
Involucres | ± obconic to campanulate, 6–10 × 5–8 mm. |
± hemispheric, 8–12 × 7–12 mm. |
Florets | 12–24+. |
40–50+. |
Phyllaries | 40–50+ in 5–6+ series, sericeo-tomentose, including margins, the outer lance-ovate, 1–2 mm, the inner lanceolate to lance-linear, 6–7(–9+) mm, tips acute. |
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 corymbiform arrays. |
in corymbiform arrays. |
Cypselae | 3–4 mm; pappi stramineous to purplish, outer scales 20+, 0.6–1.1 mm, contrasting with 20+, 6–7+ 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 lindheimeri |
Vernonia larseniae |
|
Phenology | Flowering Jun–Aug. | Flowering Jun. |
Habitat | Calcareous soils, rocky banks | Arroyos, on limestone |
Elevation | 300 m (1000 ft) | 800–900 m (2600–3000 ft) |
Distribution |
AR; TX; Mexico (Coahuila)
|
TX; Mexico (Coahuila) |
Source | FNA vol. 19, p. 210. | FNA vol. 19, p. 210. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. lindheimeri var. leucophylla | |
Name authority | A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847) | B. L. King & S. B. Jones: Brittonia 27: 84. (1975) |
Web links |