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Mexican sunflower weed, tree marigold

Habit 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.

Ray florets

7–14;

corollas yellow, laminae linear, 48–69 × 9–16 mm.

Disc florets

80–120+.

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.

Cypselae

4–6 mm.

Paleae

10–13 × 2–3 mm, mucros 1.5–2.5 mm.

2n

= 34.

Tithonia diversifolia

Phenology Flowering Sep–Jan.
Habitat Disturbed sites
Elevation 0–20+ m [0–100+ ft]
Distribution
from FNA
FL; TX; Mexico [Introduced in North America; also introduced in West Indies, Central America, Asia, Africa, Atlantic Islands, Indian Ocean Islands, Pacific Islands, Australia]
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Discussion

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

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

Source FNA vol. 21, p. 139.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Helianthinae > Tithonia
Sibling taxa
T. rotundifolia, T. thurberi
Synonyms Mirasolia diversifolia
Name authority (Hemsley) A. Gray: Proc. Amer. Acad. Arts 19: 5. (1883)
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