Ambrosia cheiranthifolia A.Gray

Rio grande ragweed (en)

Species

Angiosperms > Asterales > Asteraceae > Ambrosia

Characteristics

Perennials or subshrubs, 10–30+ cm (rhizomatous and/or soboli­ferous, colonial). Stems erect. Leaves opposite (distal sometimes alternate); petioles 0; blades lanceolate or lance-elliptic to lance-oblong or oblanceolate, 20–50(–70+) × 8–12(–25+) mm, rarely ± pinnately lobed (lobes ± deltate), bases cuneate (then rounded), margins entire or toothed, abaxial faces densely strigose (silvery gray), adaxial faces strigillose. Pistillate heads clustered (in axils), proximal to staminates; florets 1(–2). Staminate heads: peduncles 1–4+ mm; involucres cup-shaped (sometimes with black nerve in each lobe), 3–4+ mm diam., strigillose; florets 8–18+. Burs: bodies ± pyriform to ± globose, 2–3+ mm, glabrous or strigose, spines (1–)3–5+, scattered, stoutly conic, 0.4–0.8+ mm, tips straight (often each with black nerve). 2n = 72.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
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Mature height (meter) 0.1 - 0.3
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OctNovDec
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Environment

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Hardiness (USDA) 6-11

Usage

Uses medicinal
Edible -
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Animal toxicity -

Cultivation

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Distribution

Ambrosia cheiranthifolia world distribution map, present in Mexico and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:176069-1
WFO ID wfo-0000042641
COL ID CPNQ
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Ambrosia cheiranthifolia