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cadillo chisaca, coat buttons, tridax


Habit Perennials [annuals], 10–40[–80+] cm.

procumbent to ascending.


petioles 1–10(–30) mm;

blades 10–40(–120) × 5–20(–60) mm, often 3-lobed.

basal and/or cauline; opposite; petiolate [sessile];

blades deltate, lanceolate, lance-ovate, or ovate, often pinnately or palmately lobed, ultimate margins coarsely toothed to subentire, faces glabrate, hirsute, scabrellous, or strigillose.


cylindric to hemispheric, 4–8 mm diam.


convex to conic, paleate (paleae ± persistent, lance-linear, scarious, weakly conduplicate, often apically toothed).

Ray florets

[0–]3–8[–13], pistillate, fertile;

corollas pale yellow [white or purplish].

Disc florets

[20–]40–80+, bisexual, fertile;

corollas yellowish [whitish or purplish], tubes shorter than cylindric or funnelform throats, lobes 5, usually deltate [sometimes rays 0 and corollas of peripheral florets ± bilabiate].


persistent, 11–15+ in 2–3+ series (outer usually shorter, more herbaceous, the inner often scarious).


radiate [discoid], borne singly [in ± cymiform arrays].


2–2.5 mm;

pappi 4–5(–7.5) mm.

obconic to obpyramidal, 3-, 4-, or 5-angled, densely piloso-sericeous [glabrous, villous];

pappi [sometimes wanting in rays] persistent, of [10–]20[–40], plumose [ciliate], setiform scales.


= 10.


= 36.

Tridax procumbens


Phenology Flowering Jan–Dec.
Habitat Disturbed sites
Elevation 0–10 m (0–0 ft)
from FNA
FL; TX; Mexico [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from USDA
mostly tropical; mostly New World [Introduced in North America]
[BONAP county map]

Tridax procumbens is listed as a noxious weed for United States and is listed as a pest or noxious weed for nine or more states.

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

Species ca. 26 (1 in the flora).

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

Source FNA vol. 21, p. 180. FNA vol. 21, p. 179. Author: John L. Strother.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Galinsoginae > Tridax Asteraceae > tribe Heliantheae > subtribe Galinsoginae
Subordinate taxa
T. procumbens
Name authority Linnaeus: Sp. Pl. 2: 900. (1753) Linnaeus: Sp. Pl. 2: 900. (1753): Gen. Pl. ed. 5, 382. (1754)
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