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tall elephantsfoot

elephant's foot

Habit Plants (1–)6–7+ dm. Perennials, (1–)2–8(–12+) dm; often rhizomatous or stoloniferous.
Leaves

mostly basal at flowering;

blades oblanceolate, 9–14(–20+) cm × 20–35(–45+) mm (including petioles), abaxial faces pilose to hirsute, adaxial sparsely pilose to hirsute.

mostly basal or mostly cauline at flowering;

sessile or petiolate, petioles ± winged (often clasping at bases);

blades mostly elliptic, ovate, or obovate to lanceolate, oblanceolate, or spatulate (rarely orbiculate), bases ± cuneate, margins usually toothed (rarely entire), apices obtuse to acute, abaxial or both faces usually resin-gland-dotted.

Bracts

rounded-deltate to lance-deltate, 8–12+ × 6–8+ mm.

Involucres

± cylindric, 1–3+ mm diam.

Florets

(1–)4(–5+);

corollas white or pink to purple, tubes longer than abruptly funnelform throats, lobes 5, lance-linear, unequal (abaxial sinus deepest).

Phyllaries

8 in 4 decussate pairs, the outer 4 ovate, inner 4 lanceolate, all ± chartaceous, margins entire, tips ± spinose to apiculate, abaxial faces of inner 4 usually dotted distally with resin glands.

Inner phyllaries

6–8 mm, ± densely strigose to villous, hairs (0.3–)0.5–1 mm.

Heads

± discoid, sessile, not individually bracteate, in clusters of (1–)10–40+ in corymbiform-paniculiform arrays 6–15(–25) cm diam. (each cluster subtended by 2–3 ± deltate bracts).

Cypselae

3–3.5 mm;

pappi 3–4 mm.

± clavate, sometimes ± flattened, 10-nerved or -ribbed, strigillose to hirsutulous;

pappi persistent, of 5(–6), 1-aristate scales (look closely for squamiform, gradually to abruptly tapering base of each arista).

x

= 11.

2n

= 22.

Elephantopus elatus

Elephantopus

Phenology Flowering Aug–Sep.
Habitat Open or shaded, dry to wet places in pine forests and mixed forests, usually on sandy soils
Elevation 0–50 m (0–200 ft)
Distribution
from FNA
AL; FL; GA; LA; MS; SC
[WildflowerSearch map]
[BONAP county map]
from USDA
Mostly warm-temperate; subtropical; and tropical regions worldwide; sometimes as naturalized ruderals
[BONAP county map]
Discussion

Species 12–15+ (4 in the flora).

Pseudelephantopus spicatus is sometimes treated as a member of Elephantopus.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Leaves at flowering all or mostly cauline
E. carolinianus
1. Leaves at flowering mostly basal (cauline leaves much smaller or wanting)
→ 2
2. Inner phyllaries 9–11+ mm; pappi 6–8 mm
E. tomentosus
2. Inner phyllaries 6–8 mm; pappi 3–4.5 mm
→ 3
3. Inner phyllaries ± densely strigose-villous with hairs (0.3–)0.5–1 mm; cypselae 3– 3.5 mm
E. elatus
3. Inner phyllaries sparsely strigose or hispidulous with hairs 0.05–0.3(–0.5) mm; cypselae 2.5–3 mm
E. nudatus
Source FNA vol. 19, p. 203. FNA vol. 19, p. 202. Author: John L. Strother.
Parent taxa Asteraceae > tribe Vernonieae > Elephantopus Asteraceae > tribe Vernonieae
Sibling taxa
E. carolinianus, E. nudatus, E. tomentosus
Subordinate taxa
E. carolinianus, E. elatus, E. nudatus, E. tomentosus
Name authority Bertoloni: Mem. Reale Accad. Sci. Ist. Bologna 2: 607. (1850) Linnaeus: Sp. Pl. 2: 814. (1753): Gen. Pl. ed. 5, 355. (1754)
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