Flora of North America species comparison

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Ambrosia ambrosioides

ambrosia bursage, ambrosia leaf bur ragweed, ambrosia leaf burbush, big bur-sage
Habit Shrubs, 60–150+ cm.
Stems

erect.
Leaves

mostly alternate;

petioles 10–35 mm;

blades lanceolate to narrowly triangular, 50–150+ × 18–55+ mm, bases truncate to cordate, margins coarsely toothed (not spiny), abaxial and adaxial faces ± hirsutulous and gland-dotted.
Staminate heads

peduncles 2–4(–12) mm;

involucres ± saucer-shaped, 4–6+ mm diam., ± hirsutulous;

florets 40–60+.
Pistillate heads

clustered on lateral axes, proximal to staminates;

florets 4–5.
Burs

bodies ± fusiform, 6–8+ mm, stipitate-glandular, spines 60–80+, scattered, subulate, 4–6 mm, tips uncinate.
2n

= 36.

Ambrosia ambrosioides
Phenology Flowering Mar–May.
Habitat Sandy soils, washes, banks
Elevation (100–)500–1000+ m ((300–)1600–3300+ ft)
Distribution
from FNA
AZ; CA; Mexico (Baja California, Baja California Sur, Chihuahua, Durango, Sonora)
[WildflowerSearch map]
[BONAP county map]
Discussion

Ambrosia ambrosioides has been reported from California; it may occur there.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 12.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Ambrosia
Sibling taxa
A. acanthicarpa, A. artemisiifolia, A. bidentata, A. chamissonis, A. cheiranthifolia, A. chenopodiifolia, 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 Xanthidium ambrosioides
Name authority (Delpino) W. W. Payne: J. Arnold Arbor. 45: 410. (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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