WALNUT FAMILY JUGLANDACEAE
Aromatic trees with alternate, pinnately compound leaves. The leaflets are toothed and have resin dots beneath. The tiny green male and female flowers are on the same tree. The male flowers are in long slender catkins; the female are in short upright clusters. The fruit is a nut with a hard shell, enclosed in a husk. Includes walnuts and butternuts (Juglans genus) and hickories (Carya genus).
WATER-LILY FAMILY NYMPHAEACEAE
Water-lilies are aquatic plants. The number of sepals and petals is variable and the sepals and petals may be difficult to tell apart. The radially symmetrical flowers are very showy. The long stalked floating leaves are round or heart-shaped.
WATERLEAF FAMILY HYDROPHYLLACEAE
The radially symmetrical flowers have 5 sepals and 5 petals, and the 5 stamens often protrude from the corolla. In the Phacelia genus the flat blue flowers on a curved stem suggest forget-me-nots. In the Hydrophyllum genus the bell-shaped flowers are in loose terminal clusters. The leaves may be alternate or opposite, simple or pinnately compound, and sometimes are basal. The plants are often hairy.
WILLOW FAMILY SALICACEAE
Trees or bushes with alternate, simple, usually toothed leaves. The tiny male and female flowers are on separate trees in crowded, narrow catkins. Fruit is a capsule containing many seeds attached to silky white down. Includes willows (Salix genus), usually with long, lance-shaped leaves and upright catkins and favoring wet places; and poplars and aspens (Populus genus), trees with stalked, heart- to egg-shaped, toothed leaves and hanging catkins.
WINTERGREEN FAMILY PYROLACEAE
These small woodland plants have radially symmetrical, often nodding flowers with 5 sepals, 5 petals and 10 stamens. The leaves are usually evergreen, or "nevergreen" in the genus Monotrema, whose members lack chlorophyll and are parasitic or saprophytic. In this genus the scale-like leaves are white, yellow, or reddish. In the other genera leaves are alternate, basal or whorled.
WITCH-HAZEL FAMILY HAMAMELIDACEAE
Trees or bushes with alternate simple leaves that are palmately lobed in some species. Locally represented by Witch-hazel (Hamamelis genus) with its small clusters of 4-petalled yellow flowers and fruit that is a 2-layered capsule that splits in two; and Sweetgum (Liquidambar genus) with its tiny flowers crowded into clusters and a fruit that is a hanging ball composed of many individual seed capsules.
WOOD SORREL FAMILY OXALIDACEAE
Only the genus Oxalis is represented locally. The radially symmetrical, usually solitary flowers have 5 sepals and 5 petals. The alternate compound leaves have 3 clover-like, inversely heart shaped leaflets that are each often folded down the center. Both flowers and leaves are on relatively long stems. The juice is often sour, leading to the old name "Sour grass".