There are plenty of wildflowers to see along the Hamilton Mountain Trail.
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Forest flowers include: Candyflower (Calytonia sibirica), Small-Flowered Blue-Eyed Mary (Collinsia parviflora), Pacific Bleeding Heart (Dicentra formosa), Thimbleberry (Rubus parviflorus), a lone patch of Pacific Rhododendron (Rhododendron macrophyllum) near the upper trailhead, Fringecup (Tellima grandiflora), Trailing Blackberry (Rubus ursinus), Vanilla leaf (Achlys triphylla), False Solomon`s Seal (Maianthemum racemosum), Star Solomon`s Seal (Maianthemum stellatum), Western Baneberry (Actaea rubra), Hooker`s Fairybell (Disporum hookeri), Smooth Yellow Violet (Viola glabella), Pacific Waterleaf (Hydrophyllum tenuipes), Columbia Windflower (Anemone deltoidea), Large-Leaved Avens (Geum macrophyllum), Western Meadowrue (Thalictrum occidentale), and a few Spotted Coralroot (Corallorrhiza maculata) starting. There are many Small-Flowered Tiger Lily (Lilium columbianum) in bud... no blooms yet.
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As you climb higher into open/mixed areas, the following flowers are blooming: Slender Woodland Star (Lithophragma tenellum), Spring Gold (Lomatium utriculatum), Chickweed Monkeyflower (Mimulus alsinoides), Western Saxifrage (Saxifraga occidentalis), Small-Flowered Alumroot (Heuchera micrantha), Paintbrush (Castilleja sp.), Chocolate Lily (Fritillaria lanceolata), Spring whitlow-grass (Draba verna), Wild Strawberry (Fragaria vesca), Mountain sweet-cicely (Osmorhiza chilensis), Rosy Plectritis (Plectritis congesta), Larkspur (probably Delphinium menziesii), Dwarf Oregon-Grape (Mahonia nervosa), as well as more Small-Flowered Blue-Eyed Mary, Candyflower, and Fringecup.
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Blooming on ridges near the summit: Few-flowered Lomatium (Lomatium martindalei), abundant Spreading Phlox (Phlox diffusa).
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Blooming en route to the Saddle: Heartleaf Arnica (Arnica cordifolia), Red-Flowering Currant (Ribes sanguineum), Serviceberry (Amelanchier alnifolia), Chocolate Lily, Dwarf Oregon-Grape, Wild Strawberry, Small-Flowered Blue-Eyed Mary, Serviceberry, Meadowrue, Yellow Violet, Candyflower, Baneberry, and Fairybell.
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The most prevalent flower blooming at the saddle is Spreading Phlox, with Serviceberry and Paintbrush on the slopes, and some Few-flowered Lomatium.