Flora of North America species comparison

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Ambrosia cordifolia

Ambrosia dumosa

heartleaf bursage, Tucson bur ragweed, Tucson burr ragweed

burro-weed, burrobush, bursage, white bur-sage
Habit Shrubs, 30–50+ cm. Shrubs, 10–40(–60+) cm.
Stems

erect.

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.

mostly alternate;

petioles 2–8(–12+) mm;

blades (white) ovate to elliptic, 10–25(–45) × 8–15(–30) mm, (1–)2–3-pinnately lobed, abaxial and adaxial faces densely strigillose.
Staminate heads

peduncles 0–1 mm;

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

florets 8–30+.

peduncles 0–1(–2) mm;

involucres shallowly cup-shaped, 3–5 mm diam., ± strigillose;

florets 8–15+.
Pistillate heads

clustered, proximal to staminates;

florets (1–)2.

intermixed with staminates (sometimes wanting or staminates sometimes wanting, plants unisexual);

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.

bodies ± globose, 3–5+ mm, pilosulous and/or gland-dotted, spines 12–25+, scattered, ± subulate (± navicular at bases), 2–4 mm, tips straight.
2n

= 36, 72, 108, 126.

Ambrosia cordifolia

Ambrosia dumosa
Phenology Flowering Mar–Apr. Flowering Mar–May(–Dec).
Habitat Sandy washes, benches Rocky or sandy washes, benches
Elevation 700–1200 m (2300–3900 ft) (-100–)100–1200(–1500) m ((-300–)300–3900(–4900) ft)
Distribution
from FNA
AZ; Mexico (Sinaloa, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; NV; UT; Mexico (Baja California, Sonora)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 14. FNA vol. 21, p. 13.
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. eriocentra, A. grayi, A. hispida, A. ilicifolia, A. linearis, A. monogyra, A. psilostachya, A. pumila, A. salsola, A. tomentosa, A. trifida
Synonyms Franseria cordifolia Franseria dumosa
Name authority (A. Gray) W. W. Payne: J. Arnold Arbor. 45: 421. (1964) (A. Gray) W. W. Payne: J. Arnold Arbor. 45: 422. (1964)
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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