Rubus plicatusSection Rubus

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This is one of the most widespread members of section Rubus, occuring on dry, strongly acidic sandy soils throughout Britain and Ireland. It can be locally abundant on heathlands, where the fresh yellow-green growth in late spring is eye-catching. Like most members of the section it flowers in early summer and quickly produces small fruit. It is similar to several other section Rubus species, but can be identified by a combination of its simply branched inflorescences with relatively few flowers, a total lack of glands and by short stamens with usually no hairs on the anthers. Also by the plicate leaves with broadly ovate to elliptical terminal leaflets. Unlike a few other similar species, the leaves never have more than five leaflets.

plicatus plicatus

Flowers are about 2cm in diameter with white or pink petals (often those with pinkish petals fade very quickly in sunlight, but the pink colour may be visible in the unopened ones). Petals are broadly elliptical with a rounded apex and are not touching when fully open. Sepals are distinctly shining green due to sparse hairs, except on the margins, giving the appearance of a white border in bud – a typical feature of most Section Rubus species and some other species.

plicatus plicatus plicatus

Styles are green and in this species the stamens are fairly short, with only a few typically over-topping the styles when viewed from the side (or they may be mostly shorter).

plicatus plicatus

Leaves are sharply indented along the veins (plicate) and coarsely serrately toothed. They are quite smooth and shiny in appearance above, in common with many section Rubus species, but usually have some sparse hairs.

plicatus plicatus

They are also relatively thinly and shortly hairy below.

plicatus plicatus

The stems turn a brownish colour in the sun and are almost hairless and shining, with rather widely-separated fairly slender but long prickles, typically (as below) red at the base and yellow at the tip. They are sometimes falcate (hooked). There are usually numerous sessile glands (i.e. unstalked glands typically yellowish or orange in colour like tiny grains of sand). These are often more noticeable on Section Rubus species due to the lack of hairs and normal stalked glands, but nearly all Rubus species do have sessile glands on the stems and floral branches. They are of little use in identification.

plicatus plicatus