Ranunculus rotundidens Ericss.

Ranunculus rotundidens (Julin) Ericss. 1992 In: Ann. Bot. Fenn. 29: 151. Most important morphological characters: medium-sized (slim) plant with linear or oblanceolate, toothless cauline leaves, medium-sized most developed basal leaves with angle 0–40° of leaf base. Basal cycle leaves trilobated with no leaves with whole leaf blade – most developed leaves with 3-lobed leaf blade with deeply lobed or even divided lateral segments and wide, deeply lobed main segment, overlapped with lateral segments, therefore the outline of leaf blade looks round, resembling leaves of R. acris. Flowers with partially developed petals. From similar species with rounded leaves differs by much bigger, lobated and overlapped main lobes of basal leaves (Fig. 15). Distribution and ecology in Latvia: very rare, with uneven distribution pattern, mostly from southern part – in various natural and semi-natural habitats, such as alluvial grasslands (Tadenava), pine forests (Spuņciems) and parks (Džūkste). We cannot discuss about characteristic habitats and distribution in the region, additional research on the distribution and additional herbaria material in Latvia are needed.