[Wildflowers With 5 Petals East of the Cascade Mountains of Oregon and Washington]

The Rose Family East of the Cascade Mountains of Oregon and Washington


Mountain Avens: Dryas octopetala

Mountain Avens: Dryas octopetala

Members of the Rose Family Found East of the Cascade Mountains of Oregon and Washington:

Trees or shrubs:

Serviceberry: Amelanchier alnifolia: Shrub or tree to 25 feet tall. White flowers with 5 thin, twisted petals are clustered in groups of 3 to 6. The flower clusters are frequently found arising from the stems where the oval leaves also arise. The flowers often stand up above the stems while the leaves hang down. The oval leaves only have teeth at the rounded tip. The styles generally number ten. The upper leaf surface is usually smooth and hairless when in fruit. The fruits are not hairy.

Cusick's Serviceberry: Amelanchier cusickii -

Utah Serviceberry: Amelanchier utahensis - Similar to above but the styles number fewer than 5 and the upper leaf surface is usually somewhat hairy during the bearing of fruit. The fruits are somewhat hairy.

Mountain Mahogany: The Genus Cerocarpus - Evergreen shrub or small tree from 15-40 feet tall. The leaves are alternate, dark green above and paler below with thick, leathery blades and margins that curl under. The flowers are greenish-white and inconspicuous in the leaf axils.

Cotoneasters: The Genus Cotoneaster -

Purple-flowering Cotoneaster: Cotoneaster atropurpureus

Spreading Cotoneaster: Cotoneaster divaricatus

Shiny Cotoneaster: Cotoneaster lucidus

Magnificent Cotoneaster: Cotoneaster magnificus

Taiping Cotoneaster: Cotoneaster villosulus

Hawthorns: The Genus Crataegus -

Black Hawthorn, Douglas' Hawthorn: Crataegus douglasii

Piper's Hawthorn: Crataegus piperi

Suksdorf's Hawthorn: Crataegus suksdorfii

Ocean Sprays: The Genus Holodiscus

Ocean Spray: Holodiscus discolor

Gland Ocean spray: Holodiscus dumosus

Apples and Crabapples: The Genus Malus -

Common Medlar, Medlar: Mespilus germanica

Osoberry, Oso-berry: Oemleria cerasiformis (Synonyms: Exochorda davidiana, Nuttallia cerasiformis, Nuttallia davidiana, Oemleria cerasiformis var. lancifolia, Oemleria cerasiformis var. nigra, Osmaronia cerasiformis) -

Yellow Rose, Shrubby Cinquefoil: Pentaphylloides floribunda (formerly Potentilla fruticosa) - A prostrate to erect shrub often used for landscaping. The leaves are pinnately compound with 5 narrowly elliptical leaflets from 1-2 cm long. The leaflets are covered with silky hairs. The flowers are showy and bright yellow, measuring up to 2.5 cm across

Squawapple: Peraphyllum ramosissimum - A rigidly branched, medium-sized shrub up to 8 feet tall with a rounded crown. The leaves are in groups (like a pine's needles), the individual leaves narrow, oblanceolate with pointed tip, leathery texture, dark green color, and entire margins. The 1-3 flowers are at the tips of the branches. They are pink to rose in color.

Rocky Mountain Rockmat: Petrophytum caespitosum ssp. caespitosum

Halfshrub Rockmat, Chelan Rockmat: Petrophyton cinerascens (Synonyms: Petrophyton cinerascens, Spiraea cinerascens) - Prostrate, matted sub-shrub with flower stems 5-15 cm high. Inflorescence a tight raceme of white flowers 2-6 cm in length. Leaves oblanceolate-spatulate in outline, glacous gray-blue to blue-green in color.

Ninebarks: The Genus Physocarpus

Tall Ninebark: Physocarpus capitatus

Mallow Ninebark: Physocarpus malvaceus

The Wild Cherries: The Genus Prunus

Bitter Cherry: Prunus emarginata var. emarginata

Choke Cherry: Prunus virginiana var. melanocarpa

Antelope Bitterbrush: Purshia tridentata - Shrub to 12 feet. Flowers small, light yellow, and arranged loosely along the stems. Leaves tiny, simple, and typically with 3 small lobes or "toes" at the distal end. Leaves a dark green, shaped not unlike a birds foot, and very similar in shape to that of big sagebrush, although smaller and greener.

Firethorns: The Genus Pyracantha

Pears: The Genus Pyrus

The Wild Roses: The Genus Rosa

Dog Rose: Rosa canina

Baldhip Rose: Rosa gymnocarpa

Nootka Rose: Rosa nutkana var. hispida

Pearhip Rose: Rosa woodsii var. ultramontana

Blackberries, Raspberries & Thimbleberries: The Genus Rubus

Western Red Raspberry: Rubus idaeus

Evergreen Blackberry: Rubus laciniatus

Blackcap: Rubus leucodermis

Thimbleberry: Rubus parviflorus

Five-leaf Bramble: Rubus pedatus

Dewberry, Trailing Blackberry: Rubus ursinus var. macropetalus

The Mountain Ash: The Genus Sorbus

Cascade Mt. Ash: Sorbus scopulina

Dwarf Mt. Ash, Sitka Mt. Ash: Sorbus sitchensis

The Spiraeas: The Genus Spiraea

Birchleaf Spiraea: Spiraea betulifolia var. lucida

Mountain Spiraea: Spiraea splendens

Hardhack: Spiraea douglasii

Pyramid Spiraea: Spiraea pyramidata

II. Herbaceous Wildflowers:

Western Lady's-mantle: Aphanes occidentalis (Synonym: Alchemilla arvensis) - Probably an introduced weed, it is a low, spreading annual with freely branched stems from 2-10 cm long. The leaves are short-petioled with simple but deeply lobed blades from 4-8 mm long. The flowers are borne along much of the length of the stems, with 5-15 common at each node.

Silverweed: Argentina anserna (Synonym: Potentilla anserina) - A grayish, silky-haired perennial which is somewhat strawberry-like. Typically prostrate with wide ranging stolons which root at the nodes. The leaves are basal, 10-30 cm long, and pinnately compound. The 15-25 leaflets are obovate to oblong in shape with sharply, coarsely toothed margins. Individual leaflets range from 1-3.5 cm long. The flowers are solitary at the nodes of the stolons or on naked stems from 3-10 cm long. The petals are yellow and 8-12 mm long The stamens number 20-25.

Mountain Avens: The Genus Dryas

Yellow Mountain Avens: Dryas drummondii

White Mountain-avens: Dryas octopetala

Wild Strawberries: The Genus Fragaria

Woods Strawberry: Fragaria vesca var. vesca

Broad-petal Strawberry: Fragaria virginiana var. platypetala

 Avens: The Genus Geum

Yellow Avens: Geum aleppicum

Large-leaf Avens: Geum macrophyllum

Slender-stemmed Avens: Geum rossii

Old Man's Whiskers, Prairie Smoke: Geum triflorum

Horkelias: The Genus Horkelia - A perennial with pinnately compound basal leaves and several stems from 20-40 cm high. Basal leaves with 7-13 narrowly oblanceolate or linear-cuneate segments or leaflets tipped with 2-3 toothed segments to 2 cm long. The leaf blade is 3-8 cm long. There are several stem leaves. The petals are cream colored, 5-6 mm long and obovate in shape. There are 10-20 pistils.

Bighead Horkelia, Big-headed Horkelia, Horkelia, Pink Pinwheels: Horkelia fusca ssp. capitata (Synonyms: Horkelia capitata, Horkelia fusca var. capitata)

Pinewoods Horkelia, Tawny Horkelia, Horkelia: Horkelia fusca ssp. fusca

Smallflower Horkelia, Small-flowered Horkelia: Horkelia fusca ssp. parviflora (Synonyms: Horkelia fusca var. parviflora, Horkelia parviflora)

Littlehead Horkelia, Woolly-leaf Horkelia: Horkelia fusca ssp. pseudocapitata (Synonym: Horkelia fusca var. pseudocapitata)

Clustered Horkelia, Threetooth Horkelia: Horkelia tridentata ssp. tridentata (Synonym: Potentilla tilingii)

Ivesia: The Genus Ivesia

Owyhee Ivesia: Ivesia baileyi var. beneolens

Golden Ivesia: Ivesia gordonii

Cinquefoils: The Genus Potentilla

Sharp-toothed Cinquefoil: Potentilla arguta

Biennial Cinquefoil: Potentilla biennis

Short-leaved Cinquefoil: Potentilla brevifolia

Brewer's Cinquefoil: Potentilla breweri (P. drummondii ssp. breweri)

Mountain Meadow Cinquefoil: Potentilla diversifolia

Drummond's Cinquefoil: Potentilla drummondii

Fan-leaf Cinquefoil: Potentilla flabellifolia

Sticky cinquefoil: Potentilla glandulosa

Graceful Cinquefoil, Five-finger Cinquefoil: Potentilla gracilis

Norwegian Cinquefoil: Potentilla norvegica

Newberry's Cinquefoil: Potentilla newberryi

Sheep Cinquefoil: Potentilla ovina

Marsh Cinquefoil, Purple Cinquefoil: Potentilla palustris

Alpine Cinquefoil: Potentilla pensylvanica

Brook Cinquefoil: Potentilla rivalis

Varying Cinquefoil: Potentilla versicolor

Burnet: Sanguisorba occidentalis - Annual or biennial herb with strong taproot and freely branched. Leafy stems from 20-60 cm high. Leaves pinnately compound and 3-8 cm long with up to 17 leaflets or segments which are narrowly linear. Inflorescence an ovoid to cylindrical spike up to 30 mm long and 7-7 mm thick.

Creeping Sibbaldia, Sibbaldia: Sibbaldia procumbens (Synonyms: Potentilla procumbens, Potentilla sibbaldii) - Low, mat-forming perennial with small strawberry-like leaves, the 3 leaflets wedge-shaped with squared tips with 3-5 teeth. Flowers yellow in clusters of 2-15, the petals and stamens shorter than the hairy sepals.

Paul Slichter E-mail