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Tithonia thurberi
A. Gray
Family:
Asteraceae
Arizona sunflowerweed,
more...
Arizona sunflower weed
Anthony Mendoza
Flora of North America
Resources
John C. La Duke in Flora of North America (vol. 21)
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.
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.
Paleae
11-16.5 × 2-4 mm, mucros 3 mm.
Ray florets
7-10; corollas yellow, laminae oblong, 9-15 × 4-6 mm.
Disc florets
40-60.
Cypselae
6-9 mm.
2n
= 34. Flowering Aug-Sep. Disturbed areas, canyons, watercourses; 900-1000 m; Ariz.; Mexico (Sonora).
Open Interactive Map
Anthony Mendoza
Anthony Mendoza
Thomas Van Devender
Thomas Van Devender
Nick Deyo
Thomas Van Devender
Thomas Van Devender
Rorabaugh, J.C.
Thomas Van Devender
Thomas Van Devender
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