Article from Bean's Trees and Shrubs Hardy in the British Isles
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'Smilax walteri' from the website Trees and Shrubs Online (treesandshrubsonline.
A deciduous climber, with angled stems, armed only near the base; branches squarish, unarmed. Leaves ovate to ovate-lanceolate, 2 to 41⁄2 in. long, 3⁄4 to 21⁄2 in. wide, broadly wedge-shaped to slightly heart-shaped at the base, ending in a short fine point, five- or seven-nerved, glabrous and green on both sides; stalk 1⁄4 to 1⁄2 in. long. Flowers greenish, in short and flat-stalked umbels. Berries bright coral-red, globose, 1⁄3 in. wide.
Native of the eastern United States from New Jersey southwards; introduced early in the 19th century; rarely seen now. It is akin to S. rotundifolia, but has narrower, proportionately longer leaves, and is not so vigorous a grower. Also in S. rotundifolia the fruits are black.