This cute little flowering non-native wildflower is very common across central and southern Florida. Well, cute, but also somewhat invasive in Florida. Look for it popping out of sidewalk cracks and along cement walkways, some of its preferred habitats. Keys to its identification include the serrated arrowhead-shaped leaves and three-toothed ray floret flowers. Mayans have used this plant, which is native to their region, to treat coughs, chills, and fever. In its native Mexico it is currently known as Flor Amarilla. In India, the fresh leaf juice is used to treat wounds and bleeding. It is known as Jayanti Veda in Sankrit. There are some very interesting studies that point to this plant's actions against certain insects and fungi. The essential oil has shown insecticidal action against house flies, mosquitoes, cockroaches, etc., and other extracts have been shown to be effective against Cowpea Weevils and Aflatoxin. Additional studies have shown that the powdered leaves, added to the soil, combat Southern Root-Knot Nematodes. It is used as a green poultry feed in Nigeria. Numerous butterflies nectar at the flowers.
MEDICINAL PROPERTIES, INTERNAL: Coughs - Bleeding - Chills - Fever - Antiviral - Antioxidant - Antibiotic - Insecticidal - Anti-Inflammatory - Hepato-protective - Liver Disorders - Gastritis - Heartburn - Anticoagulant - Antifungal - Hair Tonic - Bronchial Catarrh - Doarrhea - Dysentery - Wounds - Insect Repellant
- MAYAN MEDICINE: Mayans have used it to treat coughs, bleeding, chills, and fever. Potential therapeutic activities: antiviral, antioxidant, antibiotic, insecticidal, & anti-inflammatory.
- AYURVEDIC MEDICINE: "It is used in Ayurvedic medicine for liver disorders, hepato-protection, gastritis, and heartburn." [2, via 1] Commonly used in Indian traditional medicine as an anticoagulant (reduces blood clotting), antifungal, hair tonic, bronchial catarrh, diarrhea, dysentery, wound healing & insect repellant.
MEDICINAL PROPERTIES, EXTERNAL: Boils - Blisters - Cuts - Wounds - Bleeding - Hair Tonic
- INDIA: Some reports of tribal areas in India state that the fresh leaf juice can be used to cure fresh wounds, to stop bleeding, as a hair tonic. "Tridax procumbens is also used as treatment for boils, blisters, and cuts by local healers in parts of India." [3, via 1]
BUTTERFLY ATTRACTANT: Many butterflies drink the nectar from the flowers.
CABI.ORG WRITES: "T. procumbens can be used for wound healing (Udupa et al., 1991), staunching bleeding (Burkhill, 1985) and treatment of diarrhea (Burkhill, 1985; Shashi Gupta et al., 1993), backache (Burkhill, 1985) and bronchial catarrh (Ambasta, 1986)." 
- AGAINST NEMATODES: - "Root galling by Meloidogyne incognita [the Southern Root-Knot Nematode] is reduced by powdered leaves of T. terrestris [most likely a synonym of T. procumbens?] mixed in soil (Sharma and Tiagi, 1989) and there is evidence from laboratory tests that juvenile stages of this nematode are killed by leaf extracts (Mani and Chitra, 1989)." 
- INSECTICIDAL USES: "Essential oils extracted from T. procumbens are reported to have insecticidal activity against Musca domestica [the common House Fly], Culex quinquefasciatus [the Southern House Mosquito], Dysdercus similis [a Cotton-Stainer bug?] and Supella spp. [Cockroaches] (Pathak and Dixit, 1988)."  "Extracts of this weed are reported to inhibit the growth of Culex quinquefasciatus [the Southern House Mosquito] larvae." 
- AGAINST AFLATOXIN: "Aqueous extracts inhibit aflatoxin production by Aspergillus flavus ["the major producer of Aflatoxin"] (Ghewande and Nagaraj, 1987)." 
- AGAINST COWPEA WEEVILS: "A petroleum ether extract from flowers protects cowpea seeds from damage by the bruchid Callosobruchus maculatus [a Cowpea Weevil] (Alam and Anis, 1987)." 
POLUTRY FEED: "T. procumbens is sometimes used as green feed for poultry in Nigeria (Egunjobi, 1969)." 
NATIVE TO: Tropical South America & Central America.
- HABITAT: It is found "in fields, meadows, croplands, disturbed areas, lawns, and roadsides."  It " is particularly well adapted to coarse-textured soils in tropical regions." 
- INVASIVE: Found as a weed in many countries. It holds official pest status in nine states.  It "now occurs throughout the tropics and subtropics."  "T. procumbens as a weed of 31 crops, however, this is almost certainly an underestimate. A wide range of crop types are infested, including cereals, fibres, legumes, pastures, tree crops and vegetables." 
DESCRIPTION: A low annual or short-lived perennial plant.
- LEAVES: Toothed and generally arrowhead-shaped.
- FLOWERS: Small daisy-like flowers with three-toothed ray florets.
- SEEDS: It is invasive in areas as it produces up to 1,500 windborne seeds per plant.
- ROOT: A "firm taproot." 
ETYMOLOGY: "The name Tridax refers to the three lobes of the ray flowers while procumbens refers to the prostrate, trailing habit of the stems." 
SIMILAR SPECIES: There are no other Tridax species found wild here in Florida.
It "is known for several potential therapeutic activities like antiviral, antibiotic efficacies, wound healing activity, insecticidal and anti-inflammatory activity." Many butterflies drink the nectar from the flowers. (Venice, Florida).
Roadsides, Coarse Soils
 Callus Induction Studies in Tridax procumbens [a pdf], International Journal of Biotechnology Applications, 2010
 Ethno-botanico-medicine for common human ailments in Nalgonda and Warangal districts of Telangana, Andhra Pradesh, India, Annals of Plant Sciences, 2013