Flora of North America species comparison

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Ambrosia chamissonis

beach bur, beach bur-sage, cutleaf beach bur, silver beachweed, silver bur-ragweed, silver burr ragweed, silver burweed
Habit Perennials, 50–150(–350+) cm.
Stems

prostrate or decumbent.
Leaves

mostly alternate;

petioles 15–30(–45+) mm;

blades rounded-deltate to ovate or obovate, 20–45(–70+) × 10–25(–50+) mm overall, not lobed or 1–2(–3)-pinnately lobed, bases cuneate, ultimate margins entire or toothed, abaxial and adaxial faces strigillose to sericeous.
Staminate heads

peduncles 0.5–2 mm;

involucres shallowly cup-shaped, 4–6+ mm diam., strigillose;

florets 8–25(–50).
Pistillate heads

clustered, proximal to staminates;

florets 1.
Burs

bodies fusiform to ± pyriform, 4–7+ mm, ± strigillose to pilosulous, spines 8–16+, scattered, stoutly conic or flattened- to triquetrous-subulate, 0.5–1.5+ mm, tips straight.
2n

= 36.

Ambrosia chamissonis
Phenology Flowering Apr–Nov.
Habitat Sandy beaches and strand
Elevation 0–10 m (0–0 ft)
Distribution
from FNA
AK; CA; OR; WA; BC; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 16.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Ambrosia
Sibling taxa
A. acanthicarpa, A. ambrosioides, A. artemisiifolia, A. bidentata, 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 Franseria chamissonis, Franseria chamissonis subsp. bipinnatisecta, A. chamissonis var. bipinnatisecta
Name authority (Lessing) Greene: Man. Bot. San Francisco, 188. (1894)
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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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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