Flora of North America species comparison

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Ambrosia dumosa

Ambrosia chenopodiifolia

burro-weed, burrobush, bursage, white bur-sage

San Diego bur ragweed, San Diego bur-sage, San Diego burr ragweed
Habit Shrubs, 10–40(–60+) cm. Shrubs, 30–80+ cm.
Stems

erect.

erect.
Leaves

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.

mostly alternate;

petioles 5–20 mm;

blades ovate to rounded-deltate, 20–35(–50) × 18–30(–45) mm, bases broadly cuneate to ± truncate, margins toothed, abaxial faces ± densely tomentulose (between veins), adaxial faces sparsely tomentulose, glabrescent.
Staminate heads

peduncles 0–1(–2) mm;

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

florets 8–15+.

peduncles 0–3 mm;

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

florets 12–20+.
Pistillate heads

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

florets (1–)2.

clustered, proximal to staminates;

florets 2(–3).
Burs

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

bodies obconic to fusiform, 4–6 mm, tomentulose (little, if at all, stipitate-glandular), spines 15–20+, scattered or on distal 1/2, ± subulate (the proximal basally flattened), 2–3 mm, tips usually uncinate, sometimes straight.
2n

= 36, 72, 108, 126.

= 72.

Ambrosia dumosa

Ambrosia chenopodiifolia
Phenology Flowering Mar–May(–Dec). Flowering Mar–Apr.
Habitat Rocky or sandy washes, benches Clays or sandy soils, among lava rocks
Elevation (-100–)100–1200(–1500) m ((-300–)300–3900(–4900) ft) 50–200 m (200–700 ft)
Distribution
from FNA
AZ; CA; NV; UT; Mexico (Baja California, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; Mexico (Baja California, Baja California Sur)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 13. FNA vol. 21, p. 14.
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. 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
A. acanthicarpa, A. ambrosioides, A. artemisiifolia, A. bidentata, A. chamissonis, A. cheiranthifolia, A. confertiflora, A. cordifolia, 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
Synonyms Franseria dumosa Franseria chenopodiifolia
Name authority (A. Gray) W. W. Payne: J. Arnold Arbor. 45: 422. (1964) (Bentham) W. W. Payne: J. Arnold Arbor. 45: 419. (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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