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Ambrosia chamissonis
(Less.) Greene
No occurrences found
Family:
Asteraceae
silver bur ragweed
[
Ambrosia chamissonis f. bipinnatisecta
(Less.) Payne,
more
Ambrosia chamissonis var. bipinnatisecta
(Less.) J.T. Howell,
Franseria chamissonis
Less.,
Franseria chamissonis f. bipinnatisecta
(Less.) Calder & Roy L.Taylor,
Franseria chamissonis subsp. bipinnatisecta
(Less.) Wiggins & Stockw.,
Franseria chamissonis var. bipinnatisecta
Less.
]
Images
not available
FNA
Resources
John L. Strother in Flora of North America (vol. 21)
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.
Pistillate heads
clustered, proximal to staminates; florets 1.
Staminate heads:
peduncles 0.5-2 mm; involucres shallowly cup-shaped, 4-6+ mm diam., strigillose; florets 8-25(-50).
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.
2
n
= 36. Flowering Apr-Nov. Sandy beaches and strand; 0-10 m; B.C.; Alaska, Calif., Oreg., Wash.; Mexico (Baja California).
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