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Western Balsam Poplar
- cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath
Wild China Tree
- deciduous tree of southwestern United States having pulpy fruit containing saponin
Whipple's Penstemon
- wine-lavender to black-purple flowers in several clusters on the upper half of leafy stems; Montana south through the Rocky Mountains to Arizona and New Mexico
Wynnea Americana
- a fungus composed of several apothecia that look like elongated rabbit ears; the sterile surface is dark brown and warty; the fertile surface is smooth and pinkish orange
Wynnea Sparassoides
- a fungus with a long solid stalk embedded in soil and a cauliflower-shaped yellow-brown head
Woodsia Ilvensis
- a common rock-inhabiting fern of northern temperate regions having rusty-brown stipes and lanceolate pinnate fronds
Woodsia Alpina
- slender fern of northern North America with shining chestnut-colored stipes and bipinnate fronds with usually distinct marginal sori
Woodsia Glabella
- rock-inhabiting fern of Arctic and subarctic Europe to eastern Asia
Wolstonian Glaciation
- the next-to-last Plesitocene glaciation in Britain and the deposits laid down at that time