Ambrosia grayi (A.Nelson) Shinners

Woollyleaf burr ragweed (en)

Species

Angiosperms > Asterales > Asteraceae > Ambrosia

Characteristics

Perennials, 10–30+ cm. Stems erect. Leaves mostly alternate; petioles 10–45+ mm; blades elliptic to ovate, 45–60(–100+) × 30–45(–75+) mm, usually 1–2-pinnately lobed (lobes ± lanceolate), bases cuneate, ultimate margins serrate, abaxial faces densely sericeous or strigillose (silver or grayish), adaxial faces strigillose. Pistillate heads clustered, proximal to staminates; florets (1–)2. Staminate heads: peduncles 1–2 mm; involucres saucer-shaped, 3.5–5+ mm diam., strigillose; florets 8–25(–40+). Burs: bodies ± pyriform to globose, 3–5+ mm, stipitate-glandular, spines 8–12+, scattered, stoutly conic, 0.5–1+ mm, tips straight. 2n = 36.
Life form perennial
Growth form herb
Growth support free-standing
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Mature height (meter) 0.1 - 0.3
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Flower color
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JanFebMar
AprMayJun
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OctNovDec
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Environment

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Hardiness (USDA) 4-10

Usage

Uses medicinal
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

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Distribution

Ambrosia grayi world distribution map, present in United States of America

Identifiers

LSID urn:lsid:ipni.org:names:11063-2
WFO ID wfo-0000086618
COL ID CPPB
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Gaertneria tomentosa Ambrosia grayi Franseria grayi Gaertneria grayi Franseria tomentosa