Cross-haired Rockcress, Wetsoil Rockcress: Arabis crucisetosa - Fruits erect to ascending. Flowers white with petals from 6-8 mm long. Plants 10-40 cm tall. In Oregon, this is limited to the Snake River Canyon.
Eschscholtz's Hairy Rockcress, Hairy Rockcress, Mountain Rockcress, Pacific Coast Rockcress: Arabis eschscholtziana (Synonyms: Arabis hirsuta, Arabis hirsuta var. eschscholtziana, Arabis hirsuta var. glabrata) - Fruits flattened and ascending or spreading. Flowers greenish white, cream or pinkish, the petals 4-5 mm long. Plants 15-100 cm tall.
Cascade Rockcress, Forkhaired Rockcress, Fork-haired Rockcress: Arabis furcata (Synonym: Arabis furcata var. furcata) - Fruits erect to ascending. Flowers white with petals from 5-10 mm long. Plants 20-40 cm tall. Limited to the eastern foothills of the Cascades.
Creamflower Rockcress: Arabis pycnocarpa (Synonyms: Arabis hirsuta, Arabis hirsuta var. pycnocarpa, Arabis pycnocarpa ssp. pycnocarpa, Arabis pycnocarpa var. pycnocarpa) -
Sharp-podded Rockcress: Boechera acutina (Synonyms: Arabis acutina, Arabis x divaricarpa, Arabis x divaricarpa var. interposita)
Elegant Rockcress, Purple Sicklepod Rockcress, Sicklepod Rockcress, Sickle-pod Rock Cress: Boechera atrorubens (Synonyms: Arabis atrorubens, Arabis sparsiflora, Arabis sparsiflora var. atrorubens) -
Calder's Rockcress: Boechera calderi (Synonyms: Arabis lyallii, Arabis lyallii var. lyallii) -
Cascade Rockcress: Boechera cascadensis -
Cobre Rockcress, Masonic Rockcress: Boechera cobrensis (Synonyms: Arabis cobrensis, Arabis cobrensis var. cobrensis) - Fruits recurved. Flowers white or pink, the petals 4-5 mm long. Plants less than 30 cm high.
Cusick's Rockcress, Red Rockcress: Boechera cusickii (Synonym: Arabis cusickii) - Basal and stem leaves strongly ciliate. The arched fruits are spreading. Flowers white to bright purple, the petals 7-9 mm long.
Davidson's Rockcress: Boechera davidsonii (Synonyms: Arabis davidsonii, Arabis davidsonii var. davidsonii) -
Spreading Rockcress, Spreadingpod Rockcress, Spreading-pod Rockcress, Spreading Pod Rockcress: Boechera divaricarpa (Synonyms: Arabis divaricarpa, Arabis xdivaricarpa, Arabis xdivaricarpa var. divaricarpa, Arabis xdivaricarpa var. interposita, Arabis drummondii x holboellii, Arabis interposita) - Curved fruits are erect to ascending lower on the racemes and spreading high on the racemes. Flowers white or pinkish, the petals are 4-8 mm long. Plants are 30-80 cm tall.
Hells Canyon Rockcress: Boechera hastatula (Synonym: Arabis hastatula) -
Howell's Flatseed Rockcress: Boechera howellii (Synonyms: Arabis howellii, Arabis platysperma, Arabis platysperma var. howellii) -
Lemmon's Rockcress: Boechera lemmonii (Synonyms: Arabis lemmonii, Arabis lemmonii var. lemmonii) - Fruits widely spreading to curved downward. Petals rose-purple. Plants 10-20 cm tall. Plants of high elevation.
Lyall's Rockcress, Lyall's Slender Rockcress: Boechera lyallii (Synonyms: Arabis lyallii, Arabis lyallii var. lyallii, Arabis murrayi) -
Littleleaf Rockcress, Little-leaf Rock Cress, Small-leaved Rockcress: Boechera microphylla (Synonyms: Arabis microphylla, Arabis microphylla var. macounii, Arabis microphylla var. microphylla, Boechera microphylla var. microphylla) - Fruits straight to mostly curved, ascending to spreading. Flowers pale pink to purple, the petals 5-8 mm long. Plants 10-30 cm tall. Found at lower elevations.
Hairystem Rockcress, Sicklepod Rockcress, Small-flowered Rockcress: Boechera pauciflora (Synonyms: Arabis campyloloba, Arabis holboellii, Arabis holboellii var. pinetorum, Arabis perelegans, Arabis sparsiflora, Arabis sparsiflora var. columbiana, Arabis sparsiflora var. subvillosa, Boechera pauciflora, Boechera sparsiflora var. subvillosa) -
Mount Adams Rockcress: Boechera paddoensis (Synonym: Arabis lemmonii var. paddoensis) -
Lyall's Rockcress, Lyall's Slender Rockcress, Small-flowered Rockcress: Boechera paupercula (Synonyms: Arabis lyallii, Arabis lyallii var. lyallii, Arabis lyallii var. nubigena, Boechera lyallii) - Fruits straight and nearly erect. Flowers purple, the petals 6-8 mm long. Plants 10-25 cm tall.
Dropseed Rockcress, Holboell's Rockcress: Boechera pendulocarpa (Synonyms: Arabis exilis, Arabis holboellii, Arabis holboellii var. pendulocarpa, Boechera exilis) -
Holboell's Rockcress, Woodland Rockcress: Boechera pinetorum (Synonyms: Arabis holboellii, Arabis holboellii var. pinetorum, Boechera holboellii) -
Pioneer Rockcress, Broad-seeded Rockcress: Boechera platysperma (Synonyms: Arabis platysperma, Arabis platysperma var. platysperma) - Eastern base of the Cascade Mountains.
Many-flowered Rockcress: Boechera polyantha (Synonyms: Arabis holboellii, Arabis holboellii var. retrofracta, Boechera holboellii) - ????????
Meadow Rockcress: Boechera pratincola (Synonym: Arabis x divaricarpa) -
Hoary Rockcress: Boechera puberula (Synonym: Arabis puberula) - Fruits reflexed and pendant. Flowers rose-colored to purplish. Plants 15-50 cm tall.
Holboell's Rockcress, Reflexed Rockcress, Secund Rockcress: Boechera retrofracta (Synonyms: Arabis holboellii, Arabis holboellii var. retrofracta, Arabis holboellii var. secunda, Arabis retrofracta, Arabis secunda, Boechera holbellii, Bochera hoboellii var. secunda) -
Black-flowered Rockcress, Elegant Rockcress, Sicklepod Rockcress: Boechera sparsiflora (Synonyms: Arabis arcoidea, Arabis peramoena, Arabis polytricha, Arabis sparsiflora, Arabis sparsiflora var. peramoena, Arabis sparsiflora var. sparsiflora, Boechera sparsiflora var. sparsiflora) - Pedicels in fruit spreading. Fruits ascending to spreading. Flowers pink to purplish, the petals 8-15 mm long. Plants 30-100 cm tall.
Canadian Rockcress, Drummond's Rockcress: Boechera stricta (Synonyms: Arabis albertina, Arabis brachycarpa, Arabis confinis, Arabis connexa, Arabis drummondii, Arabis drummondii var. connexa, Arabis drummondii var. oxyphylla, Arabis oxyphylla, Boechera angustifolia, Boechera brachycarpa, Boechera drummondii, Erysimum drummondii, Turritis drummondii) - Fruits erect. Flowers pink, the petals 7-12 mm long. Plants 30-80 cm tall.
Ashy Rockcress: Boechera subpinnatifida (Synonym: Arabis subpinnatifida) -
Woody Rockcress: Boechera suffrutescens (Synonyms: Arabis suffrutescens, Arabis suffrutescens var. suffrutescens) - Fruits over 3.5 mm wide and pendulous. Flowers pruplish, the petals 5-9 mm long. Plants 15-50 cm tall. Plants of high elevations.
Tower Mustard, Tower Rockcress: Turritis glabra (Synonyms: Arabis glabra, Arabis glabra var. furcatipilis, Arabis glabra var. glabra) - Fruits erect and glabrous. Flowers yellowish-white or cream, the petals 3-6 mm long. Plants 30-150 cm tall.