Ambrosia bidentata — Details

Lanceleaf Ragweed learn more about names for this taxon

Overview

Distribution

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Ambrosia bidentata Michx.:
United States (North America)
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National Distribution

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United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

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Physical Description

Morphology

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Hybrids between Ambrosia bidentata and A. trifida have been recorded.
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Description

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Annuals, 10–30(–100+) cm. Stems erect. Leaves mostly opposite; petioles 0–0.5 mm; blades ± lanceolate to lance-linear, 15–40+ × 3–6(–10+) mm, bases rounded to cordate, margins entire or with (1–)2(–4) basal lobes, abaxial and adaxial faces ± piloso-hispid and gland-dotted. Pistillate heads clustered, proximal to staminates; florets 1. Staminate heads: peduncles 0–0.5 mm; involucres obliquely cup-shaped (lateral lobe longer than others), 2.5–4 mm diam., piloso-hispid; florets 6–8+. Burs: bodies pyramidal, 5–8 mm, piloso-hispid, spines 4(–5), ± distal, ± acerose, 0.5–1 mm, tips straight.
  • Flora of North America @ eFloras.org
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Conservation

Conservation Status

National NatureServe Conservation Status

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United States

Rounded National Status Rank: N5 - Secure

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NatureServe Conservation Status

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Rounded Global Status Rank: G5 - Secure

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