Flora of North America species comparison

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Acmella repens

Acmella

oppositeleaf spotflower

spotflower
Habit Annuals or perennials, 10–20(–30+) cm.
Stems

prostrate to erect, usually branched ± throughout.
Leaves

petioles 3–40+ mm;

blades ovate to lance-ovate, mostly 20–40(–100) × 10–35 mm, margins dentate to denticulate or entire.

cauline; opposite; petiolate [± sessile];

blades (usually 3-nerved) ovate to rhombic or lanceolate [linear to filiform], bases ± cuneate, margins entire or toothed, faces sparsely pilose to strigillose, glabrescent.
Involucres

± hemispheric to ovoid, 3–6+ mm diam.
Receptacles

conic, paleate (paleae falling with fruit, ± navicular, membranous to scarious, each about equaling subtended floret).
Ray florets

0 or 5–20+, pistillate, fertile;

corollas yellow to orange [white or purplish] (laminae ovate to linear) [wanting].
Disc florets

25–100(–200+) bisexual, fertile;

corollas yellow [orange], tubes shorter than campanulate throats, lobes 4–5, deltate.
Phyllaries

persistent, 8–15+ in 1–3 series (distinct, ovate to linear, subequal or outer longer).
Heads

radiate or discoid [disciform], borne singly at tips of branches [corymbiform arrays].
Cypselae

1–2.5 mm, ciliate or not, tips of cilia straight;

pappi 0 or of 1–2(–3) bristles.

2–3-angled (peripheral) or strongly compressed, ellipsoid to obovoid (glabrous or ciliate on the 2–3 angles or ribs);

pappi 0, or fragile, of 1–3 awnlike bristles.
x

= 13.
2n

= 52.

Acmella repens

Acmella
Phenology Flowering Jan–Dec.
Habitat Disturbed, wet or drying sites
Elevation 0–200 m (0–700 ft)
Distribution
from FNA
AL; AR; FL; GA; LA; MO; MS; NC; SC; TN; TX; Mexico (Coahuila)
[WildflowerSearch map]
[BONAP county map]
from USDA
Mexico; Central America; South America; s United States; West Indies [Introduced in Asia, Africa, Pacific Islands, Australia]
[BONAP county map]
Discussion

Species 30 (2 in the flora).

Acmella pilosa R. K. Jansen has been reported as introduced in Florida (http://www.plantatlas.usf.edu); it differs from A. repens mainly by its more densely pilose stems and leaves and more truncate to cordate (versus cuneate) leaf bases.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Petioles 3–40+ mm; leaf blades ovate to lance-ovate, mostly 20–40(–100) × 10–35 mm, margins dentate to denticulate or entire
A. repens
1. Petioles 2–4 mm; leaf blades lanceolate, mostly 12–40 × 3–10 mm, margins usually sinuate-dentate, rarely entire
A. pusilla
Source FNA vol. 21, p. 133. FNA vol. 21, p. 132. Author: John L. Strother.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ecliptinae > Acmella Asteraceae > tribe Heliantheae > subtribe Ecliptinae
Sibling taxa
A. pusilla
Subordinate taxa
A. pusilla, A. repens
Synonyms Anthemis repens, A. oppositifolia var. repens, Spilanthes americana var. repens
Name authority (Walter) Persoon: Syn. Pl. 2: 473. (1807) Richard: in C. H. Persoon, Syn. Pl. 2: 472. (1807)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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