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Ambrosia chenopodiifolia
(Benth.) W.W.Payne
Family:
Asteraceae
San Diego Burr-Ragweed
[
Franseria chenopodiifolia
Benth.,
more
Franseria lancifolia
]
FNA
Resources
John L. Strother in Flora of North America (vol. 21)
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.
Pistillate heads
clustered, proximal to staminates; florets 2(-3).
Staminate heads:
peduncles 0-3 mm; involucres ± cup-shaped, 3-5 mm diam., tomentulose; florets 12-20+.
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.
2
n
= 72.
Flowering Mar-Apr. Clays or sandy soils, among lava rocks; 50-200 m; Calif.; Mexico (Baja California, Baja California Sur).
Open Interactive Map
University of Florida Herbarium
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