Vernonia acaulis |
Vernonia missurica |
|
---|---|---|
stemless ironweed |
Missouri ironweed |
|
Habit | Plants 4–6(–10) dm. | Plants 6–12(–20+) dm. |
Stems | ± puberulent, glabrescent. |
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 elliptic to lance-ovate or lanceolate, 6–16(–20+) cm × 18–48+ mm, l/w = 2.5–4(–6+), abaxially usually puberulent to tomentose or pannose (hairs ± erect, ± curled), seldom glabrate, resin-gland-dotted, adaxially scabrellous, glabrescent, not resin-gland-dotted. |
Peduncles | 5–50 mm. |
3–35 mm. |
Involucres | campanulate to hemispheric, 5–10 × 6–7 mm. |
broadly campanulate to urceolate, (6–)7–10+ × 5–9+ mm. |
Florets | 30–40(–55+). |
30–55+. |
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. |
50–70+ in 6–7 series, sparsely scabrellous, glabrescent (seldom resin-gland-dotted), margins ciliolate, the outer lanceolate, 1–2 mm, inner linear-oblong to oblong, 6–7(–9+) mm, tips acute or rounded-apiculate. |
Heads | in loose, corymbiform arrays. |
in corymbiform-scorpioid 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; pappi stramineous to whitish, outer scales 25–30, 0.5–1.1 mm, contrasting with 35–40+, 6–8+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia acaulis |
Vernonia missurica |
|
Phenology | Flowering Jul–Aug. | Flowering Jul–Sep. |
Habitat | Open woods, pine savannas, bogs, disturbed places | Prairies, loamy to sandy soils |
Elevation | 10–300 m (0–1000 ft) | 30–200 m (100–700 ft) |
Distribution |
FL; GA; NC; SC
|
AL; AR; GA; IA; IL; IN; KS; KY; LA; MI; MO; MS; OK; TN; TX
|
Source | FNA vol. 19, p. 208. | FNA vol. 19, p. 212. |
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) | Rafinesque: Herb. Raf., 28. (1833) |
Web links |