RHEUM 
129 
leones: — Smith Eng. Bot. t. 910, as Rumex digynus ; FI. Dan. t. 14, as R. digynus ; Svensk Bot. t. 692, as 
Rheum digynum\ Beck in Reichenbach Icon, xxiv, t. 202, fig. 1 — 4, as Oxyria digyna. 
Camb. Brit. FI. ii. Plate 137. (a) Ground-leaves and also flowering shoot, (b) Fruits (enlarged). ( c ) Flower 
(enlarged). Scotland (E. S. M.). 
Exsiccata : — Fries, v, 56, as Oxyria digyna ; Reichenbach, 1267, as 0 . digyna ; Rostan, 30, as 0 . digyna. 
Map 22. Distribution of Rheum digynum in the British Isles 
Perennial. Rhizome tufted. Aerial stem about 1 — 3 dm. high, almost leafless, slender. Petioles 
of the ground leaves four or five times as long as the laminae. Laminae of the ground-leaves 
usually reniform, 2 — 4 cm. broad as a rule, margin crenulate and rather wavy. Inflorescence leafless, 
branches suberect. Pedicels slender, jointed at the middle. Flowers in July and August. Perianth — 
outer segments spreading; inner ones spathulate, becoming about 1 cm. long. Achene suborbicular, 
winged, wing about as broad as the achene itself and much larger than the fruiting perianth- 
segments. 
Sides of sub- Alpine and Alpine streams on siliceous soils, locally abundant ; North Wales, 
the Lake District, southern and central Scotland, Perthshire to Shetland; ascending to 1190 m. in 
Perthshire ; western Ireland. 
M. 11. 
17 
