Erigeron annuus (L.) Pers. subsp. annuus

Taxonomy: Fam. Compositae// Genus: Erigeron// Species: Erigeron annuus (L.) Pers.// Subspecies: Erigeron annuus (L.) Pers. subsp. annuus.

Determined according to the botanical key provided by Halliday (1976 in Tutin et al.).

Note: some specimens from Shtalkovichka River show tendency towards Erigeron annuus subsp. septentrionalis (Fernald & Wiegand) Wagenitz, yet a well defined population is not yet recorded.

Lifeform: Biennial; the first year of the lifecycle is vegetative (basal rosette stage). Flowering and fruiting occurs in the second year.

Distribution: Native from Canada to U.S.A., Nicaragua to Panama; introduced in Europe, parts of Asia and parts of North America according to the distribution information provided by the Plants of the World Online portal (Royal Botanic Gardens, Kew).

Habitat: Ruderal plant found near rivers, paths, and other ruderal areas.

Flowering period: Summer- autumn (JUL, AUG, SEP, OCT, NOV).

Locality: gorge of the Kochanska River. Date: 11.10.2024.

*Erigeron annuus* subsp. *annuus* – habit. Gorge of “Kochanska” River, 11.10.2024. Photo by Trajche Dimitrovski.

Locality: gorge of the Kochanska River. Date: 23.10.2024.

*Erigeron annuus* subsp. *annuus* – capitula. Gorge of “Kochanska” River, 23.10.2024. Photo by Trajche Dimitrovski.

References:

Erigeron annuus (L.) Desf. Plants of the World Online portal, Royal Botanic Gardens, Kew. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:203539-1 [Accessed 19.10.2024].

Erigeron annuus subsp. annuus. Greuter, W. 2006+: Compositae (pro parte majore). – In: Greuter, W. & Raab-Straube, E. von, Compositae. Euro+Med PlantBase – the information resource for Euro-Mediterranean plant diversity. Published at https://europlusmed.org/. https://europlusmed.org/cdm_dataportal/taxon/0cf35f3f-d398-4eb5-afff-418d3a5c5919 [Accessed 19.10.2024].

Halliday, G. 1976. Erigeron L. (incl. Stenactis Cass.). In Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A. (eds.), Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae). Cambridge: Cambridge University Press, pp. 116–120.

Last update: 23.10.2024.

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