Erigeron pilosiusculus Sennikov, sp. 2023, hybr. nov.

• Main Authors: Sennikov, Alexander N., Kozhin, Mikhail N.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2023
• Subjects: Biodiversity; Taxonomy; Plantae; Tracheophyta; Magnoliopsida; Asterales; Asteraceae; Erigeron; Erigeron pilosiusculus; Fennoscandia; Kandalaksha Gulf; karelia*; karelian; Subarctic
• Online Access: https://doi.org/10.5281/zenodo.10170254; http://treatment.plazi.org/id/B35FB63A383A5E6BB0B38250D89ADD06

2. Erigeron × pilosiusculus Sennikov, sp. hybr. nov. Fig. 5 Type. Russia. Karelian Republic: Paanajärvi, Kauppila, torr mark nära gården [= in colle sicco], 29.07.1936, H. Lindberg [Plantae Finlandiae Exsiccatae no. 1369] (holotype H 039503 pro parte [plant 1]; isotypes H 339935 pro parte, OULU 059259). Description. Stems 25-50 cm tall, branched in the upper third, intensely to slightly purple-coloured, covered by sparse to numerous hairs 0.5-1 mm long mostly in the basal half. Cauline leaves 4-8 under the synflorescence, spaced, gradually decreasing towards the stem top, unevenly covered by sparse hairs 0.5-1 mm long on both sides. Synflorescence with long branches carrying solitary to 2-3 capitula, nearly corymbose at the top, branches subglabrous or with sparse hairs. Phyllaries 6-7.5 mm long, purple-coloured completely or near the apex, covered by sparse hairs in the basal part or up to the apex. Ray flowers dark-lilac to pale-pinkish. Pappus greyish-white. Flowers in July, fruits in July to August. As evident from the plants collected in mixed populations, the flowering and fruiting of the hybrid occur earlier than in its native parent, Erigeron politus . When plants of E. politus start to blossom, the hybrid is already in the last flowers. Distribution in Murmansk Region. Kandalaksha Gulf, Turii Mys, Varzuga River (lower course), Ponoi River (lower course) (Fig. 4B). Global distribution. Subarctic and Northern Boreal zones of Fennoscandia. Etymology. The species epithet, meaning 'slightly more hairy’ ( pilosior , Lat.: more hairy; - usculus , Lat.: diminutive suffix), was selected to reflect a slighly greater hairiness of the hybrid in comparison to its more glabrous parent, E. politus . Nomenclature note. The type collection is taxonomically mixed. It contains typical plants of E. rigidus and the hybrid, which is less hairy and slightly less vigorous. This collection was distributed by Lindberg (1944) in his exsiccatae but its specimens were formed by chance: some appear to contain plants of E. rigidus ...