Note: This is a relatively difficult route due to the number of downed trees across the 3 trees, length, steep elevation loss and gains and exposure along the eastern end of the Cedar Creek Trail where it follows a ridgetop steeply down to Fifteenmile Creek. The trail tread there has numerous spots where there are rolly rocks atop harder packed trail. In addition, the Underhill Trail from Forest Road #4421 dowhnill to Fifteenmile Creek is so lightly used that once the grasses have grown, the route can be difficult to find.
Coral Fungi: Ramaria sp.
Brown-eyed Wolf Lichen: Letharia columbiana
Wallace's Selaginella: Selaginella wallacei
Lady Fern: Athyrium filix-femina ssp. cyclosorum
Fragile Fern: Cystopteris fragilis
Lace Fern: Myriopteris gracillima
Western Sword Fern: Polystichum munitum
Northern Bracken Fern: Pteridium aquilinum var. pubescens
Pacific Silver Fir: Abies amabilis
Grand Fir: Abies grandis
Noble Fir: Abies procera
Western Juniper: Juniperus occidentalis
Western Larch: Larix occidentalis
Engelmann Spruce: Picea engelmannii
Lodgepole Pine: Pinus contorta var. latifolia
Western White Pine: Pinus monticola
Ponderosa Pine: Pinus ponderosa var. ponderosa
Douglas Fir: Pseudotsuga menziesii var. menziesii
Western Red Cedar: Thuja plicata
Western Hemlock: Tsuga heterophylla
Mountain Hemlock: Tsuga mertensiana
Vine Maple: Acer circinatum
Douglas Maple: Acer glabrum var. douglasii
Chinquapin: Chrysolepis chrysophylla
Oregon Boxwood: Paxistima myrsinites
Black Cottonwood: Populus trichocarpa
Scouler's Willow: Salix scouleriana
Elk Sedge: Carex geyeri
* Little-wing Sedge: Carex microptera ?
* Lemmon's Needlegrass: Achnatherum lemmonii ssp. lemmonii
* Mountain Brome: Bromus sitchensis var. marginatus ?
* Cheatgrass: Bromus tectorum
* One-spike Oatgrass: Danthonia unispicata
* Longleaf Squirrel-tail Grass: Elymus elymoides (ssp. brevifolius ?)
* Blue Wildrye: Elymus glaucus ssp. glaucus
* Quackgrass: Elymus repens
* Idaho Fescue: Festuca idahoensis
* Prairie Junegrass: Koeleria macrantha
Bulbous Bluegrass: Poa bulbosa
Nevada Bluegrass ? : Poa secunda (ssp. nevadensis ?) - Past bloom.
Sandberg's Bluegrass: Poa secunda ssp. secunda - Past bloom.
* Bluebunch Wheatgrass: Pseudoroegneria spicata - Beginning to bloom.
North African Grass: Ventenata dubia
* Small Fescue: Vulpia microstachys
* Tapertip Onion: Allium accuminatum - Beginning to bloom.
Sagebrush Mariposa: Calochortus macrocarpus var. macrocarpus - In bud.
* Bead Lily: Clintonia uniflora - Beginning to bloom.
Yellow Bells: Fritillaria pudica - Fruits drying and ready to spill seeds.
Washington Lily: Lilium washingtonianum ssp. purpurascens - In bud.
* False Solomon Seal: Maianthemum racemosum ssp. amplexicaule
* Star-flowered False Solomon Seal: Maianthemum stellatum
Meadow Death Camas: Toxicoscordion venenosum - Past bloom.
Wood Lily: Trillium ovatum - Past bloom.
* Bicolor Cluster Lily: Triteleia grandiflora var. howellii
* Hyacinth Cluster Lily: Triteleia hyacinthina
Douglas' Grass Widows: Olsynium douglasii var. douglasii - Past bloom.
* Spotted Coral Root: Corallorhiza maculata
Rattlesnake Plantain Orchid: Goodyera oblongifolia
* Alaska Rein Orchid: Platanthera unalascensis
* Sheep Sorrel: Rumex acetosella - At Fifteen Mile Forest Camp
* Heartleaf Buckwheat: Eriogonum compositum var. compositum - Cream-flowered form.
* Sulfur-flowered Buckwheat: Eriogonum umbellatum var. sandbergii
* Douglas' Knotweed: Polygonum douglasii
* Kellogg's Knotweed: Polygonum polygaloides ssp. kelloggii
* Red-Miner's Lettuce: Claytonia rubra ssp. rubra
* Bitterroot: Lewisia rediviva
* Slender Mountain Sandwort: Eremogone capillaris var. americana
* Largeleaf Sandwort: Moehringia macrophylla
* Oregon Catchfly: Silene oregana
* California Vanilla Leaf: Achlys californica
* Vanilla Leaf: Achlys triphylla
Cascade Oregon Grape: Berberis nervosa
Creeping Oregon Grape: Berberis repens
* Oregon Anemone: Anemone oregana
False Bugbane: Trautvetteria caroliniensis
* Creamy Stonecrop: Sedum oregonense
* Broadleaf Stonecrop: Sedum spathulifolium
* Wormleaf Stonecrop: Sedum stenopetalum var. stenopetalum
Oaks Toothwort: Cardamine nuttallii - Fruits forming.
* Alpine Alumroot: Heuchera cylindrica
Brook Saxifrage: Micranthes odontoloma
* Prickly Currant: Ribes lacustre - Fading out of bloom.
* Sticky Currant: Ribes viscosissimum - Fading out of bloom.
Pacific Serviceberry: Amelanchier alnifolia (var. alnifolia ?)
* Nevada Cinquefoil: Drymocalls lactea var. lactea
* Woods Strawberry: Fragaria vesca ssp. bracteata
* Broad-petal Strawberry: Fragaria virginiana ssp. platypetala
Creambush Oceanspray: Holodiscus discolor var. discolor - In bud
Bittercherry: Prunus emarginata var. emarginata
Bitterbrush: Purshia tridentata
* Little Wild Rose: Rosa gymnocarpa (var. gymnocarpa ?)
* Dwarf Bramble: Rubus lasiococcus
Thimbleberry: Rubus parviflorus var. parviflorus
Greene's Mountain Ash: Sorbus scopulina
Birch-leaf Spiraea: Spiraea lucida
* Desert Pea: Lathyrus lanszwertii var. aridus
* Leafy Pea: Lathyrus polyphyllus
* Spurred Lupine: Lupinus arbustus
* Broad-leaf Lupine: Lupinus latifolius var. latifolius
* Silky Lupine: Lupinus sericeus
* Stream Violet: Viola glabella
* Marsh Violet: Viola palustris
Snowbrush: Ceanothus velutinus var. velutinus
* Diamond Clarkia: Clarkia rhomboidea
Tall Annual Willowherb: Epilobium brachycarpum
* Diffuse Groundsmoke: Gayophytum diffusum ssp. parviflorum
* Nineleaf Desert Parsley: Lomatium brevifolium ? or * Nineleaf Desert Parsley: Lomatium triternatum ? - Leaf divisions very narrow, much like L. simplex, but shorter. Fading out of bloom.
Barestem Desert Parsley: Lomatium nudicaule
Common Sweet Cicely: Osmorhiza berteroi - Fruits maturing.
Hairy Manzanita: Arctostaphylos columbiana ?
Pinemat Manzanita: Arctostaphylos nevadensis
Green-leaved Manzanita: Arctostaphylos patula
* Little Prince's Pine: Chimaphila menziesii - Beginning to bloom.
Pipsissewa: Chimaphila umbellata - In bud.
Sidebells Wintergreen: Orthillia secunda - In bud.
Pinedrops: Pterospora andromedea
White-vein Shinleaf: Pyrola picta - In bud.
Thin-leaved Huckleberry: Vaccinium membranaceum
Grouseberry: Vaccinium scoparium
* Columbia Frasera: Frasera albicaulis var. columbiana
Desert Shooting Stars: Dodecatheon conjugens - Past bloom.
* Starflower: Lysimchia latifolia
* Large-flowered Collomia: Collomia grandiflora
* Whiskerbrush: Leptosiphon ciliatus ? - or very hairy Leptosiphon bicolor
Harkness' Linanthus: Leptosiphon harknessii
* Midget Phlox: Microsteris gracilis - Fading out of bloom.
* Mountain Navarretia: Navarretia divaricata
* Spreading Phlox: Phlox diffusa
* California Polemonium: Polemonium californicum - Beginning to bloom.
Dwarf Hesperochiron: Hesperochiron pumilus
* Varileaf Phacelia: Phacelia heterophylla ssp. virgata
* Cryptanth: Cryptantha sp. - Small flowers.
* Short-sepal Bluebells: Mertensia brachycalyx or Northern Bluebells: Mertensia paniculata
* Thompson's Paintbrush: Castilleja thompsonii
* Small-flowered Blue-eyed Mary: Collinsia parviflora - Fading out of bloom.
* Brewer's Monkeyflower: Erythranthe breweri
Woodland Beardtongue: Nothochelone nemorosa
* Glaucous Penstemon: Penstemon euglaucus - Beginning to bloom.
* Shrubby Penstemon: Penstemon fruticosus var. fruticosus
* Lowly Penstemon: Penstemon humilis var. humilis
Cleavers: Galium aparine
* Twinflower: Linnaea borealis - Beginning to bloom.
* Orange Honeysuckle: Lonicera ciliosa - Beginning to bloom.
* Purple-flower Honeysuckle: Lonicera conjugialis - Beginning to bloom.
* Black Twinberry: Lonicera involucrata - Beginning to bloom.
* Creeping Snowberry: Symphoricarpos mollis var. hesperius
* Mountain Heliotrope: Valeriana sitchensis
Scouler's Harebell: Campanula scouleri
* Common Yarrow: Achillea millefolium - Beginning to bloom.
Pathfinder: Adenocaulon bicolor
Large-flowered Agoseris: Agoseris grandiflora
Annual Agoseris: Agoseris heterophylla - Past bloom.
Low Pussytoes: Antennaria dimorpha - Past bloom.
* Racemose Pussytoes: Antennaria racemosa
* Rosy Pussytoes: Antennaria microphylla
* Heartleaf Arnica: Arnica cordifolia - Fading out of bloom.
* Mountain Arnica: Arnica latifolia
* Carey's Balsamroot: Balsamorhiza careyana - Fading out of bloom.
Tall Silvercrown: Cacaliopsis nardosmia ssp. glabrata - Past bloom.
Hall's Goldenweed: Columbiadoria hallii - In bud.
Gray Rabbitbrush: Ericameria nauseosa (var. ?)
Cascade Aster: Eucephalus ledophyllus
* Least Tarweed: Hemizonella minima
* White-flowered Hawkweed: Hieracium albiflorum
Scouler's Hawkweed: Hieracium scouleri - In bud.
* Mountain Tarweed: Madia glomerata
* Nodding Microseris: Microseris nutans
Sweet Coltsfoot: Petasites frigidus
False Silverback: Rainiera stricta - In bud.
* Creamy Western Groundsel: Senecio integerrimus var. ochroleucus - Beginning to bloom.
* Woolly Goldenweed: Stenotus lanuginosus var. lanuginosus ? - Fading out of bloom.
Salsify: Tragopogon dubius