Contains 5 accepted taxa overall.
Characteristics
Classification
Citation
AMBROSIA Linnaeus, Sp. Pl. 987. 1753.
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TYPE: Ambrosia maritima Linnaeus Lectotypified by Britton & A. Brown, Ill. Fl. N. U.S., ed. 2. 3: 340. 1913.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Ambrosia artemisiifolia | Common Ragweed | |||
| Ambrosia bidentata | Lanceleaf Ragweed | |||
| Ambrosia porcheri | Glade Ragweed | |||
| Ambrosia psilostachya | Perennial Ragweed | |||
| Ambrosia trifida var. trifida | Giant Ragweed |
Identification Key
1. Leaf blade with 3-5 lobes or unlobed
1. Leaf blade 1-3-pinnatified or 1-3-pinnately lobed
2
2. Plant densely hispid or pilose, usually with a creeping, prostrate stem and erect offshoots; most leaves 2-3-pinnatifid or 2-3-pinnately lobed
2. Plant sparsely to densely strigillose or hispid, stems erect; most leaves 1-pinnatifid or 1-pinnately lobed or the pinnae with sparse, few shallow lobes or teeth
3
3. Annual, the taproot with copious fibrous roots; petioles mostly (3)15-40(65) mm long; fruit with
3. Perennial, mostly stout roots near the surface, often clonal from horizontal roots; petioles 0-15(25) mm long
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| No synonyms found. | |||