(w) - Weeds or non-native species
Shining Oregon Grape: Berberis aquifolium
Creek Dogwood: Cornus sericea
Oregon White Ash: Fraxinus latifolia
English Ivy: Hedera helix ssp. helix
Black Cottonwood: Populus trichocarpa
Oregon White Oak: Quercus garryana var. garryana
Douglas Fir: Pseudotsuga menziesii var. menziesii
Poison Oak: Toxicodenderon diversilobum
Wallace's Spikemoss: Selaginella wallacei
Fragile Fern: Cystopteris fragilis
Goldback Fern: Pentagramma triangularis ssp. triangularis - On shaded cliffs.
Licorice Fern: Polypodium glycyrhiza
Orchard-grass: Dactylis glomerata (w)
* Annual Bluegrass: Poa annua (w) - Along road around the park.
* Common Camas: Camassia quamash ssp. maxima - Beginning to bloom at the park. Common along Plymouth Street.
* Fawn Lily: Erythronium oreganum - Past their peak.
* Mission Bells: Fritillaria affinis
False Lily-of-the-Valley: Maianthemum dilatatum
False Solomon Seal: Maianthemum racemosum ssp. amplexicaule
Starry Solomon Plume: Maianthemum stellatum - In bud.
* Western Wakerobin: Trillium ovatum
* Siberian Spring Beauty: Claytonia siberica
* Sticky Mouse-ear Chickweed: Cerastium glomeratum (w)
Western Columbine: Aquilegia formosa
Larkspur: Delphinium sp.
* Western Buttercup: Ranunculus occidentalis - Beginning to bloom.
* Mouse-ear Cress: Arabidopsis thaliana (w)
* American Wintercress: Barbarea orthoceras (w)
Angled Toothwort: Cardamine angulata ? - Compare stem and basal leaves with photos online. Has white flowers.
* Hairy Bittercress: Cardamine hirsuta (w) - Blooming and going to seed.
* Slender Toothwort: Cardamine nuttallii var. nuttallii - Has pink flowers.
* Spring Whitlow-grass: Draba verna
* Honesty: Lunaria annua
Broad-leaf Stonecrop: Sedum spathulifolium - In bud on sunny cliffs.
Worm-leaf Stonecrop: Sedum stenopetalum
Small-flowered Prairiestar: Lithophragma parviflorum
Fringecups: Tellima grandiflora
* Straggly Currant: Ribes divaricatum var. divaricatum - By the bridge.
* Pacific Serviceberry: Amelanchier alnifolia var. semiintegrifolia
* Woods Strawberry: Fragaria vexca ssp. bracteata
Creambush Oceanspray: Holodiscus discolor
Osoberry: Oemleria cerasiformis - Fruits ripening.
Pacific Ninebark: Physocarpus capitatus
Choke Cherry: Prunus virginiana var. demissa - In bud.
* Small-flowered Lupine: Lupinus micranthus - Outside the park, 200 meters uphill along Plymouth St., near S 7th St..
Bigleaf Lupine: Lupinus polyphyllus var. polyphyllus - Not in bloom.
* Subterraneum Clover: Trifolium subterraneum (w) - Outside the park, 200 meters uphill along Plymouth St., near S 7th St..
* Filaree: Erodium cicutarium - Outside the park, 200 meters uphill along Plymouth St., near S 7th St.. (w) ?????
Shining Geranium: Geranium lucidum
* Dovefoot Geranium: Geranium molle (w)
Cascara: Rhamnus purshiana
* Fern-leaf Desert Parsley: Lomatium dissectum var. dissectum
* Spring Gold: Lomatium utriculatum
* Greater Periwinkle: Vinca major
Oregon Phacelia: Phacelia nemoralis ssp. oregonensis
* Red Dead-nettle: Lamium purpureum (w)
English Plantain: Plantago lanceolata (w) - In grassy areas along road in front of park
Cleavers: Galium aparine
* Red Elderberry: Sambucus racemosa var. arborescens
Oval-leaf Viburnum: Viburnum ellipticum
Nipplewort: Lapsana communis (w)
* Common Dandelion: Taraxacum officinale (w)