Ambrosia L.
EOL Text
Annual herb (in ours). Leaves alternate, petiolate, 2-pinnatisect. Capitula small, unisexual. Male capitula: racemose, many-flowered; phyllaries connate into a funnel-shaped involucre; receptacular scales filiform or 0; corolla 5-lobed, whitish. Female capitula: sessile or clustered in axils of leaves below the male; 1-flowered; corolla 0. Achenes tightly enclosed in the female involucre which bears spines or tubercles. Pappus 0. Another genus, which is atypical for Asteraceae.
| License | http://creativecommons.org/licenses/by-nc/3.0/ |
| Rights holder/Author | Mark Hyde, Bart Wursten, Petra Ballings, Flora of Zimbabwe |
| Source | http://www.zimbabweflora.co.zw/speciesdata/genus.php?genus_id=1512 |
Flowering class: Dicot Habit: Herb Distribution notes: Exotic
Strongly aromatic, annual to short-lived perennial, variously pubescent especially on stem, and with sessile yellow glands especially on lower leaf surfaces. Stem to 80(-120) cm, ± erect, branches long, ascending. Leaves with 1 cm long petiole; blade 5-10 cm, lanceolate to elliptic, irregularly coarsely serrate, sometimes shallowly sinuate to almost entire, attenuate at base, acute to obtuse at apex; bracts entire, linear - lanceolate - narrowly obovate, uppermost very small. Inflorescence paniculate, flowers sessile in small, dense glomerules usually subtended by bracts and arranged spicately. Terminal flowers bisexual, perianth deeply 5-lobed, lobes cucullate, stamens usually 5; lateral flowers female, perianth connate, 5-toothed; teeth roundish on back; perianth herbacous, glabrous to sparsely pubescent. Stigmas usually 3-4, long, slender. Fruits falling with perianth. Pericarp free. Seeds mostly horizontal, sometimes oblique or vertical, brown, 0.6-0.8 mm in diameter, somewhat ovate to circular in outline, margin obtuse; testa almost smooth, sometimes with obscure shallow pits.
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| Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
| Source | http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=200006810 |
The following is a representative barcode sequence, the centroid of all available sequences for this species.
Southern populations of Dysphania ambrosioides are native while those populations in the northern part of the flora area are introduced.
| License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
| Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
| Source | http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242414750 |
Ambrina botrys (L.) Moq. Chenop. Enum.: 37. 1840.
| License | http://creativecommons.org/licenses/by-nc-sa/3.0/ |
| Rights holder/Author | eFloras.org Copyright © Missouri Botanical Garden |
| Source | http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=200006812 |
Ambrosia (Ambrosia (ragweed)) is prey of:
Gryllus
Trigonorhinus
Chlamydatus
Plagiognathus
Reuteroscopus
Scaphytopius
Philaenus
Oecanthus
Empoasca
Lygus
Lepidoptera
Melanoplus
Based on studies in:
USA: New Jersey (Agricultural)
This list may not be complete but is based on published studies.
- D. J. Shure, Radionuclide tracer analysis of trophic relationships in an old-field ecosystem, Ecol. Monogr. 43(1):1-19, from p. 15 (1973).
| License | http://creativecommons.org/licenses/by/3.0/ |
| Rights holder/Author | Cynthia Sims Parr, Joel Sachs, SPIRE |
| Source | http://spire.umbc.edu/fwc/ |
Throughout the tropical and subtropical regions of the world, particularly in South America
"Erect pungent smelling herbs, profusely branching. Leaves alternate, to 8 x 3 cm, elliptic to lanceolate, entire to deeply lobed, base attenuate, glabrous, membranous; upper leaves smaller. Flowers bisexual, minute, sessile, clustered in terminal and axillary cymes; perianth 5-lobed, herbaceous, green; stamens 5, free; ovary 1-celled, with solitary ovule; styles 3; stigmas 3. Fruit a utricle enclosed by the persistent perianth."
Barcode of Life Data Systems (BOLDS) Stats
Public Records: 5
Specimens with Barcodes: 5
Species With Barcodes: 1