Flora of North America species comparison

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Ambrosia chenopodiifolia

San Diego bur ragweed, San Diego bur-sage, San Diego burr ragweed
Habit Shrubs, 30–80+ cm.
Stems

erect.
Leaves

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 0–3 mm;

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

florets 12–20+.
Pistillate heads

clustered, proximal to staminates;

florets 2(–3).
Burs

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

= 72.

Ambrosia chenopodiifolia
Phenology Flowering Mar–Apr.
Habitat Clays or sandy soils, among lava rocks
Elevation 50–200 m (200–700 ft)
Distribution
from FNA
CA; Mexico (Baja California, Baja California Sur)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 14.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Ambrosia
Sibling taxa
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 chenopodiifolia
Name authority (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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