Oenothera pedemontana Soldano, Rivista

Verloove, Filip & Ardenghi, Nicola M. G., 2015, New distributional records of non-native vascular plants in northern Italy, Natural History Sciences 2 (1), pp. 5-14 : 8

Oenothera pedemontana Soldano, Rivista Piemont. Storia Nat., 4: 131. 1983. [ Fig. 3 ]

( Onagraceae )

Naturalized neophyte new to the flora of Lombar- dia ( Soldano, 1983; Soldano, 1993; Banfi & Galasso, 2010).

ITALY. Lombardia. Prov. Pavia: Bereguardo, river Ticino close to the bridge, sandy river bank, 11.09.2014, F. Verloove 11016 ( BR) .

This microspecies from the Oenothera biennis aggregate (possibly a hybrid of the latter; Dietrich et al., 1997) was originally described from Piemonte, the type being from Saluggia in Torino province ( Soldano, 1983). It is now more or less widely dispersed in Piemonte (see map in Cecere et al., 2012) but had never been recorded out- side of this region ( Conti et al., 2005; Celesti-Grapow et al., 2009a). In September 2014 this species was found growing in abundance on the sandy banks of river Ticino in Bereguardo.

Characteristic features of Oenothera pedemontana are its tall habit (stem up to 230 cm long), late flower- ing, presence of glandular hairs on the hypanthium, petals wider than long (ca. 26× 17-23 mm) and relatively small capsules ca. 18-33 mm long with emarginate capsule teeth (e.g. Soldano, 1993).

Figures

Fig. 3 - Oenothera pedemontana, Bereguardo (PV), September 2014 (Photo: N.Ardenghi).