Contains 5 accepted taxa overall.
Characteristics
Classification
Citation
IVA Linnaeus, Sp. Pl. 988. 1753.
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TYPE: Iva annua Linnaeus Lectotypified by Britton & A. Brown, Ill. Fl. N. U.S., ed. 2. 3: 338. 1913.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Iva annua | Sumpweed, Rough Marsh-elder | |||
| Iva axillaris | Deer-root | |||
| Iva frutescens var. frutescens | Southern Maritime Marsh-elder | |||
| Iva imbricata | Dune Marsh-elder | |||
| Iva microcephala | Small-headed Marsh-elder |
Identification Key
1. Leaves linear to linear-lanceolate, 0.5-5 mm wide, margins entire
2
1. Leaves narrowly lanceolate, ovate, or spatulate, 5-40 mm wide, margins entire or toothed
3
2. Involucres conic or turbinate, 2.5-3 mm long; outer phyllaries partly connate
2. Involucres hemispheric, 1.5-2 mm long; outer phyllaries distinct
3. Petioles indistinct, 0-2 mm long; leaf blades 1-4(6) cm long, glabrous, eglandular (rarely gland-dotted), margins entire or up to 3(6) teeth
3. Petioles mostly distinct, 5-30 mm long; leaf blades 3-15 cm long, scabrellous, gland-dotted, margins usually toothed
4
4. Annuals, to 150 cm tall; leaf blades 1.5-3 times longer than wide
4. Perennials, to 350 cm tall; leaf blades 2.2-10 times longer than wide
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| No synonyms found. | |||