Flora of North America species comparison

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Tithonia thurberi

Arizona sunflower weed
Habit Annuals, 70–200 cm.
Leaves

petioles 0–3.3 cm;

blades deltate, 7–28 × 5.5–21.5 cm, abaxial faces sparsely hirsute (hairs larger on veins).
Peduncles

17–36 cm.
Ray florets

7–10;

corollas yellow, laminae oblong, 9–15 × 4–6 mm.
Disc florets

40–60.
Phyllaries

13–16 in 3 series, linear to spatulate;

outer 8–15 × 2.5–4.5 mm, apices acute, abaxial faces puberulent;

inner 12–15.5 × 3.5–7 mm, apices acute, abaxial faces glabrous.
Cypselae

6–9 mm.
Paleae

11–16.5 × 2–4 mm, mucros 3 mm.
2n

= 34.

Tithonia thurberi
Phenology Flowering Aug–Sep.
Habitat Disturbed areas, canyons, watercourses
Elevation 900–1000 m (3000–3300 ft)
Distribution
from FNA
AZ; Mexico (Sonora)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 139.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Helianthinae > Tithonia
Sibling taxa
T. diversifolia, T. rotundifolia
Synonyms T. palmeri
Name authority A. Gray: Proc. Amer. Acad. Arts 8: 655. (1873)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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