Flora of North America species comparison

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Ambrosia dumosa

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

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.
Staminate heads

peduncles 0–1(–2) mm;

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

florets 8–15+.
Pistillate heads

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

florets (1–)2.
Burs

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 dumosa
Phenology Flowering Mar–May(–Dec).
Habitat Rocky or sandy washes, benches
Elevation (-100–)100–1200(–1500) m ((-300–)300–3900(–4900) ft)
Distribution
from FNA
AZ; CA; NV; UT; Mexico (Baja California, Sonora)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 13.
Parent taxa 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
Synonyms Franseria dumosa
Name authority (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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