Tithonia diversifolia

(Hemsley) A. Gray

Proc. Amer. Acad. Arts 19: 5. 1883.

Common names: Tree marigold Mexican sunflowerweed
Introduced
Basionym: Mirasolia diversifolia Hemsley Biol. Cent.-Amer., Bot. 2: 168, plate 47. 1881
Treatment appears in FNA Volume 21. Treatment on page 139.

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: Flowering Sep–Jan.
Habitat: Disturbed sites
Elevation: 0–20+ m

Distribution

V21-336-distribution-map.gif

Introduced; Fla., Tex., Mexico, also introduced in West Indies, Central America, Asia, Africa, Atlantic Islands, Indian Ocean Islands, Pacific Islands, Australia.

Discussion

Tithonia diversifolia is widely cultivated in warm climates and may persist after plantings; a report for Louisiana was not confirmed for this treatment.

Selected References

None.

Lower Taxa

None.
... more about "Tithonia diversifolia"
John C. La Duke +
(Hemsley) A. Gray +
Mirasolia diversifolia +
Tree marigold +  and Mexican sunflowerweed +
Fla. +, Tex. +, Mexico +, also introduced in West Indies +, Central America +, Asia +, Africa +, Atlantic Islands +, Indian Ocean Islands +, Pacific Islands +  and Australia. +
0–20+ m +
Disturbed sites +
Flowering Sep–Jan. +
Proc. Amer. Acad. Arts +
Introduced +
Undefined (tribe Undefined) subtribe Lagasceinae +
Tithonia diversifolia +
Tithonia +
species +