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Ambrosia
Family: Asteraceae
Ambrosia image
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  • Recursos
John L. Strother in Flora of North America (vol. 21)
Annuals, perennials, or shrubs, 10-400+ cm (usually rhizomatous). Stems erect, decumbent, or prostrate, branched. Leaves usually cauline; opposite ± throughout or opposite (proximal) and alternate or mostly alternate; sessile or petiolate; blades (or lobes) deltate, elliptic, filiform, lanceolate, linear, obovate, ovate, or rhombic (and most intermediate shapes), usually pinnately, sometimes palmately lobed, ultimate margins entire or toothed, faces hairy or glabrate, usually gland-dotted or stipitate-glandular. Heads discoid (unisexual, pistillate proximal to or intermixed with staminates, staminates usually in racemiform to spiciform arrays; rarely, single plants all or mostly staminate or pistillate). Pistillate heads: phyllaries 12-30(-80+) in 1-8+ series, outer (1-)5-8 distinct or ± connate, herbaceous, the rest (sometimes interpreted as paleae) ± connate, usually with free tips forming tubercles, spines, or wings (the whole becoming a hard perigynium or 'bur'); florets 1(-5+), corollas 0. Staminate heads: involucres cup-shaped to saucer-shaped, 1.5-6+ mm diam.; phyllaries 5-16+ in ± 1 series, ± connate; receptacles ± flat or convex; paleae spatulate to linear, membranous, sometimes villous, hirtellous, and/or gland-dotted or stipitate-glandular, sometimes none; florets 5-60+; corollas whitish or purplish, ± funnelform, lobes 5, erect or incurved; staminal filaments connate, anthers distinct or weakly coherent. Cypselae (black) ± ovoid or fusiform, enclosed within globose to obovoid, pyramidal, pyriform, obconic, or fusiform, hard, smooth, tuberculate, spiny, or winged 'burs'; pappi 0. x = 18.
Vascular plants of NE US and adjacent Canada
Heads numerous, small, unisexual, rayless; staminate heads in a racemiform or spiciform, bractless infl, with subherbaceous, 5-12-lobed invol, flat receptacle with slender, filiform-setose pales, monadelphous filaments, scarcely united anthers, and undivided style; pistillate heads borne below the staminate, in the axils of lvs or bracts, with closed, nutlike or burlike invol bearing 1-several rows of tubercles or spines and containing 1(-several) pistillate fls without cor; pappus none; herbs (ours) or shrubs; lvs often lobed or dissected, in most spp. opposite at least below. 40, predominantly New World. (Franseria)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Especies en el listado: Plantas del Estado de Baja California, México
Ambrosia acanthicarpa
Image of Ambrosia acanthicarpa
Mapa no
Disponible
Ambrosia ambrosioides
Image of Ambrosia ambrosioides
Mapa no
Disponible
Ambrosia arborescens
Image of Ambrosia arborescens
Mapa no
Disponible
Ambrosia bryantii
Image of Ambrosia bryantii
Mapa no
Disponible
Ambrosia camphorata
Image of Ambrosia camphorata
Mapa no
Disponible
Ambrosia carduacea
Image of Ambrosia carduacea
Mapa no
Disponible
Ambrosia chamissonis
Image of Ambrosia chamissonis
Mapa no
Disponible
Ambrosia chenopodiifolia
Image of Ambrosia chenopodiifolia
Mapa no
Disponible
Ambrosia confertiflora
Image of Ambrosia confertiflora
Mapa no
Disponible
Ambrosia deltoidea
Image of Ambrosia deltoidea
Mapa no
Disponible
Ambrosia dumosa
Image of Ambrosia dumosa
Mapa no
Disponible
Ambrosia flexuosa
Image of Ambrosia flexuosa
Mapa no
Disponible
Ambrosia ilicifolia
Image of Ambrosia ilicifolia
Mapa no
Disponible
Ambrosia magdalenae
Image of Ambrosia magdalenae
Mapa no
Disponible
Ambrosia monogyra
Image of Ambrosia monogyra
Mapa no
Disponible
Ambrosia psilostachya
Image of Ambrosia psilostachya
Mapa no
Disponible
Ambrosia pumila
Image of Ambrosia pumila
Mapa no
Disponible
Ambrosia salsola
Image of Ambrosia salsola
Mapa no
Disponible
Este sitio es resultado de la colaboración entre los herbarios del noroeste de México y El Consorcio de SEINet. Está administrado por el Herbario de la Universidad de Sonora