Ambrosia cordifolia |
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heartleaf bursage, Tucson bur ragweed, Tucson burr ragweed |
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Habit | Shrubs, 30–50+ cm. |
Stems | erect. |
Leaves | mostly alternate; petioles 3–35 mm; blades deltate to rounded-deltate, 10–35(–80) × 10–30(–70) mm, bases cordate to truncate, margins coarsely toothed, abaxial faces densely puberulent (including veins), adaxial faces strigillose to scabrellous and gland-dotted. |
Staminate heads | peduncles 0–1 mm; involucres cup-shaped, 2–3(–5) mm diam., strigillose; florets 8–30+. |
Pistillate heads | clustered, proximal to staminates; florets (1–)2. |
Burs | bodies ± globose to fusiform, 3–4+ mm, tomentulose and stipitate-glandular, spines 8–20+, scattered, ± subulate (basally navicular), 1–2 mm, tips straight or uncinate. |
Ambrosia cordifolia |
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Phenology | Flowering Mar–Apr. |
Habitat | Sandy washes, benches |
Elevation | 700–1200 m (2300–3900 ft) |
Distribution |
AZ; Mexico (Sinaloa, Sonora)
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Source | FNA vol. 21, p. 14. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Ambrosia |
Sibling taxa | |
Synonyms | Franseria cordifolia |
Name authority | (A. Gray) W. W. Payne: J. Arnold Arbor. 45: 421. (1964) |
Web links |