Lepidium densiflorum Schrad.

Kozhin, Mikhail & Sennikov, Alexander, 2022, New records in non-native vascular plants of Russian Lapland, Biodiversity Data Journal 10, pp. 78166-78166 : 78166

Lepidium densiflorum Schrad.

Lepidium densiflorum Schrad., Index Seminum Horti Göttingen. 1832: 4 (1832).

Description

The species differs from the other species of Lepidium by the absence or near absence of petals, the absence of smell, larger fruits (ca. 3-3.5 mm long) in dense racemes ( Tzvelev 2000), as well as stems and pedicels with very short capitate pubescence (D. German, pers. comm.).

Distribution

Native distribution

North America.

Secondary distribution

Europe, Asia, South America.

Distribution in neighbouring territories

Common and fully naturalised in southern Finland, rare casual in northern Finland ( Suominen 1998). Rather rare but established in southern Karelia ( Kravchenko 2007). Common and fully naturalised in North-Western European Russia ( Tzvelev 2000), included in the list of most invasive plants in Russia ( Vinogradova et al. 2018).

New record

Russia. Murmansk Region. Kandalaksha Town. SE side of the crossing of Ulitsa Gor'kogo and Ul. Pronina, surroundings of a gas station, 32.40583°N, 67.15888°E, sandy railway bank, 5.08.2011, P. Uotila 49222 (H 824080).

Pathways of introduction

Transport - Stowaway: Vehicles (car, train).

Period of introduction

Russia (after 1991).

This species was recorded from the place with intense transport activity, in current use. Its very recent introduction is therefore beyond doubt.

Invasion status

Only a few individuals were observed. The collector's notes suggested a casual occurrence.

Ecology

Open places, river sands, disturbed grasslands.

Biology

Annual (or overwintering biennial). Therophyte with taproot.