Utricularia australis R. Br.

Kapitonova, Olga A., 2020, Additions to the vascular flora of the Tyumen region, Western Siberia, Acta Biologica Sibirica 6, pp. 339-355 : 339

Utricularia australis R. Br.

Material examined.

RUSSIA, Tyumen Reg. - Tobolsk distr. • neighbourhood of Suzgun station; 58.2228°N, 68.1915°E; left coast of the floodplain of the Irtysh River , in a lake with shallow water; 21 Jul. 2018; V.I. Kapitonov leg. • 400 m S of village Bajgara; 58.0236°N, 68.8440°E; lake in the floodplain of the Irtysh River with shallow water on the east shore; 3 Jul. 2019. • 300 m S of village Bajgara; 58.0246°N, 68.8442°E; lake at the right bank of the Irtysh River , shallow water off the shore; 3 Jul. 2019 (Fig. 1 ) .

Note.

There are three specimens with flowers. This species differs well from its closely related Utricularia vulgaris L. based on the following characters: corolla with lower lip flat and spreading margins, palate without hairs ( Taylor 1989) and some additional characters such as, the long straight pedicels, slightly deflected from the peduncle, being three or more times longer than the bracts, free anthers not intergrown with each other, and the curved S-shaped stem ( Tzvelev 2000; Lisitsyna et al. 2009) (Fig. 3 ). This species is characterized by some environmental preferences. So, it was revealed that U. australis grows in warm (~ 26 °C), alkaline (pH 8.3 median value) and shallow (<20 cm) waters ( Ceschin et al. 2020). The examined species grows in the European part of Russia ( Tzvelev 2000; Lisitsyna et al. 2009), including those specimens found in the southern regions (Astrakhan region) ( Kapitonova et al. 2011) and in the Vyatka-Kama Cis-Urals ( Kapitonova 2015). For Western Siberia, the species was not previously recorded ( Lisitsyna and Papchenkov 2000; Doron'kin 2012).

Figures

Figure 1. The locations of the species cited in the article. The numbers in circles denote the locations of the following species: 1 - Potamogeton x acutus, Potamogeton tenuifolius, Utricularia ochroleuca; 2 - Potamogeton lacunatus; 3 - Potamogeton lacunatus, Utricularia australis; 4 - Potamogeton x pseudolacunatus; 5 - Stellaria fennica, Utricularia australis; 6 - Cypripedium macranthos; 7 - Pedicularis dasystachys, Ranunculus silvisteppaceus; 8 - Stuckenia chakassiensis x S. macrocarpa, Elodea sanadensis, Zannichellia repens; 9 - Impatiens glandulifera, Phragmites altissimus; 10 - Phragmites altissimus; 11 - Galega orientalis.

Figure 3. Utricularia australis R. Br. Tobolsk distr., 400 m S of village Bajgara, lake in the floodplain of the Irtysh River, 3 Jul. 2019. Photo by author.