Flora of North America species comparison

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Ambrosia cordifolia

Ambrosia hispida

heartleaf bursage, Tucson bur ragweed, Tucson burr ragweed

coastal ragweed
Habit Shrubs, 30–50+ cm. Perennials, 10–50(–80+) cm.
Stems

erect.

prostrate or decumbent.
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.

mostly opposite;

petioles 5–25 mm;

blades rounded-deltate to ovate or elliptic, 20–35+ × 10–30+ mm, 2–3-pinnately lobed, bases cuneate, ultimate margins entire or toothed, abaxial and adaxial faces strigillose.
Staminate heads

peduncles 0–1 mm;

involucres cup-shaped, 2–3(–5) mm diam., strigillose;

florets 8–30+.

peduncles 1–2 mm;

involucres obliquely cup-shaped, 2–3+ mm diam., strigillose;

florets 5–20+.
Pistillate heads

clustered, proximal to staminates;

florets (1–)2.

clustered, proximal to staminates;

florets 1.
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.

bodies ± pyriform, 1–2 mm, ± strigillose, spines or tubercles 0–5+, near middles or distal, stoutly conic, 0.1–0.5+ mm, tips straight.
2n

= 104.

Ambrosia cordifolia

Ambrosia hispida
Phenology Flowering Mar–Apr. Flowering Apr.
Habitat Sandy washes, benches Sandy beaches or strand
Elevation 700–1200 m (2300–3900 ft) 0–10 m (0–0 ft)
Distribution
from FNA
AZ; Mexico (Sinaloa, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
FL; Central America; West Indies (Bahamas)
[BONAP county map]
Source FNA vol. 21, p. 14. FNA vol. 21, p. 16.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Ambrosia Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Ambrosia
Sibling taxa
A. acanthicarpa, A. ambrosioides, A. artemisiifolia, A. bidentata, A. chamissonis, A. cheiranthifolia, A. chenopodiifolia, A. confertiflora, A. deltoidea, A. dumosa, A. eriocentra, A. grayi, A. hispida, A. ilicifolia, A. linearis, A. monogyra, A. psilostachya, A. pumila, A. salsola, A. tomentosa, A. trifida
A. acanthicarpa, A. ambrosioides, A. artemisiifolia, A. bidentata, A. chamissonis, A. cheiranthifolia, A. chenopodiifolia, A. confertiflora, A. cordifolia, A. deltoidea, A. dumosa, A. eriocentra, A. grayi, A. ilicifolia, A. linearis, A. monogyra, A. psilostachya, A. pumila, A. salsola, A. tomentosa, A. trifida
Synonyms Franseria cordifolia
Name authority (A. Gray) W. W. Payne: J. Arnold Arbor. 45: 421. (1964) Pursh: Fl. Amer. Sept., 2: 743. (1813)
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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