Unidentified Mustard (possibly Arabis ? )

Waldo Rockcress: Arabis aculeolata (Synonym: Arabis aculeolata var. aculeolata) ? - One record from the North Steens Mt.

Cobre Rockcress, Masonic Rockcress: Arabis cobrensis (Synonyms: Arabis cobrensis var. cobrensis, Boechera cobrensis) - Fruits recurved. Flowers white or pink, the petals 4-5 mm long. Plants less than 30 cm high.

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.

Cusick's Rockcress, Red Rockcress: 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: Arabis davidsonii (Synonym: Arabis davidsonii var. davidsonii) -

Spreading Rockcress, Spreadingpod Rockcress, Spreading Pod Rockcress: Arabis x divaricarpa (Synonyms: Arabis acutina, Arabis divaricarpa, 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.

Canadian Rockcress, Drummond's Rockcress: Arabis drummondii (Synonyms: Arabis albertina, Arabis brachycarpa, Arabis confinis, Arabis connexa, 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.

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.

Tower Mustard, Tower Rockcress: Arabis glabra (Synonyms: Arabis glabra var. furcatipilis, Arabis glabra var. glabra, Turritis glabra) - Fruits erect and glabrous. Flowers yellowish-white or cream, the petals 3-6 mm long. Plants 30-150 cm tall.

Hells Canyon Rockcress: Arabis hastatula -

Eschscholtz's Hairy Rockcress, Hairy Rockcress, Pacific Coast Rockcress: Arabis hirsuta var. escholtziana (Synonym: Arabis eschscholtziana) - Fruits flattened and ascending or spreading. Flowers greenish white, cream or pinkish, the petals 4-5 mm long. Plants 15-100 cm tall.

Hairy Rockcress, Mountain Rockcress: 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.

Creamflower Rockcress: Arabis hirsuta var. pycnocarpa -

Holboell's Rockcress: Arabis holboellii - Pedicels in fruit recurved or reflexed. Straight to slightly curved fruits pendulous and often pressed tightly against the stem. Flowers white to pinkish-purple, the petals 5-10 mm long. Plants 10-100 cm tall.

Dropseed Rockcress: Arabis holboellii var. pendulocarpa (Synonyms: Arabis exilis, Arabis holboellii, Arabis pendulocarpa, Boechera exilis, Boechera pendulocarpa) -

Holboell's Rockcress: Arabis holboellii var. pinetorum (Synonyms: Arabis holboellii, Arabis pinetorum, Boechera holboellii var. pinetorum, Boechera pinetorum) -

Holboell's Rockcress, Second Rockcress, Secund Rockcress: Arabis holboellii var. retrofracta (Synonyms: Arabis arcuata, Arabis caduca, Arabis consanguinea, Arabis dacotica, Arabis exilis, Arabis holboellii, Arabis holboellii var. collinsii, Arabis holbellii var. consanguinea, Arabis holboellii var. secunda, Arabis holbellii var. tenuis, Arabis kochii, Arabis lignipes, Arabis mcdougalii, Arabis polyantha, Arabis retrofracta, Arabis retrofracta var. multicaulis, Arabis rhodanthus, Arabis secunda, Arabis tenuis, Boechera exilis, Boechera holbellii var. retrofracta, Bochera hoboellii var. secunda, Boechera retrofracta, Boechera tenuis) -

Lemmon's Rockcress: Arabis lemmonii (Synonyms: Arabis lemmonii var. lemmonii, Arabis lemmonii var. typica, Boechera 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: Arabis lyallii (Synonyms: 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.

Small-leaved Rockcress: Arabis 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.

Nuttall's Rockcress: Arabis nuttallii - Fruits erect-ascending. Flowers white or pale lilac, the petals 6-8 mm long. Plants 8-35 cm tall.

Howell's Flatseed Rockcress: Arabis platysperma var. howellii (Synonym: Arabis howellii) -

Pioneer Rockcress, Broad-seeded Rockcress: Arabis platysperma var. platysperma -

Hoary Rockcress: Arabis puberula - Fruits reflexed and pendant. Flowers rose-colored to purplish. Plants 15-50 cm tall.

Sicklepod Rockcress, Black-flowered Rockcress, Elegant Rockcress: Arabis sparsiflora - Pedicels in fruit spreading. Fruits ascending to spreading. Flowers pink to purplish, the petals 8-15 mm long. Plants 30-100 cm tall.

Woody Rockcress: 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.