Compilation
Tithonia diversifolia

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Name

Identification
Tithonia diversifolia (Hemsl.) A. Gray [family ASTERACEAE ]
Related name
  • Tithonia diversifolia
Common name
  • Mexican sunflowerweed, Flora of North America Vol. 21
  • Tree marigold, Flora of North America Vol. 21

Flora

Entry for Tithonia diversifolia (Hemsley) A. Gray [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 21,
Names
Tithonia diversifolia (Hemsley) A. Gray [family COMPOSITAE], Proc. Amer. Acad. Arts, 19 : 5. 1883
Mirasolia diversifolia Hemsley [family COMPOSITAE], Biol. Cent.-Amer., Bot., 2 : 168, plate 47. 1881
Treatment Author(s)
John C. La Duke
Information
Perennials, subshrubs, or shrubs, to 250(–500) cm. Leaves: petioles 2–6 cm; blades ± deltate to pentagonal, 7–33 × 7–22 cm, sometimes 3- or 5-lobed, abaxial faces glabrous to hispid-pilose. Peduncles 7–24 cm. Phyllaries 16–28 in (3–)4 series, oblong to ovate; outer 6–10 × 4–7 mm, apices rounded to acute, abaxial faces usually glabrous; inner 10–20 × 3–10 mm, apices rounded to acute, abaxial faces glabrous. Paleae 10–13 × 2–3 mm, mucros 1.5–2.5 mm. Ray florets 7–14; corollas yellow, laminae linear, 48–69 × 9–16 mm. Disc florets 80–120+. Cypselae 4–6 mm. 2n = 34.
Phenology
dec-jan (winter), sep-nov (fall)
Altitude range
0–20+ m;
Distribution
Mexicoalso introduced in West IndiesCentral AmericaAsiaAfricaAtlantic IslandsIndian Ocean IslandsPacific IslandsAustralia.USA Fla.USA Tex.
Discussion
Tithonia diversifolia is widely cultivated in warm climates and may persist after plantings; a report for Louisiana was not confirmed for this treatment.
Native/Introduced
introduced;

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