Photo © Craig Robson |
Occasional, in less acid lochs, usually in fairly deep water. Search for washed-up bits. Leaves c 5-15 cm long x 1.5-4 cm wide ID: Leaves clasping the stem, but not completely surrounding it as is usual in P perfoliatus. Stipules remain in place on mature stems and only fall when stem ageing, unlike those of P perfoliatus which disappear early. Stipules up to 8 cm long on this species (up to 2 cm on P perfoliatus), opaque when dry (translucent when dry on P perfoliatus). Leaf-tips clearly hooded, so that leaf-tip cannot be flattened without a tear or fold. Other features: No specialised floating leaves. Grows throughout the winter and can flower as early as May. Infloresences on long stalks (8-20 cm), which may or may not be thickened towards the tip. |
