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By George A. Petrides

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Additional info for A Field Guide to Western Trees: Western United States and Canada

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Leaves basal, alternate, or opposite, rarely whorled, simple. Flowers unisexual or bisexual, sepals 4–5, fused at base, petals mostly 5-lobed, rarely 4, fused, often snapdragon-like, stamens 2 or 4, sterile stamens 0–2, ovary superior. Fruit are capsules. Herbaceous annuals, perennials, subshrubs, and shrubs. Page 330. platanaceae—sycamore family. Leaves alternate, simple, lobed. Bark peeling in patches, giving trunk a mottled appearance. Flowers unisexual, both sexes on same plant, small, in round heads.

Trees and shrubs, rarely herbaceous. Page 214. linnaeaceae—twinflower family. Leaves opposite, mostly simple. Flowers bisexual, funnel-shaped or snapdragon-like, sepal lobes mostly 5, petal lobes 5, stamens 4, attached at two di=erent levels, ovary inferior. Fruit, capsules or achenes. Subshrubs, shrubs, and small trees. Page 328. malvaceae—mallow family. Leaves alternate, simple, often lobed and somewhat maple-like. Flowers bowl-shaped, sepals and petals 5, stamens 5 to many, 52 p l a n t fa mil ie s fused at base forming a tube, ovary superior.

Similar species grow at higher elevations in northern California than in southern British Columbia. Subalpine. A short growing season and ample precipitation, mostly in the form of winter snow, characterize this habitat found at the upper limits of tree growth. The forest here is dominated by subalpine fir, Engelmann spruce, and mountain hemlock, with deciduous larches also found near and east of the Cascade crest. Craggy whitebark pines are sometimes found on drier or harsher sites. Open meadows, both wet and dry, are interspersed with rocky outcrops and pockets of forest.

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