MUSTARD FAMILY 359 



4. A. furcata S. Wats. Perennial, with a cespitose caudex or rootstock; 

 stems 1-3 dm. high, glabrous; basal leaves spatulate, 2-4 cm. long, often ciliate 

 on the margin; stem-leaves oblong or oblanceolate; petals 7-8 mm. long; pedicels 

 5-15 mm. long; pods 2-3.5 cm. long. A. Bridgeii M. E. Jones. Mountains: 

 Wash. Mont. Ore. Submont. Mont. My-Au. 



6. A. ovata (Pursh) Poir. Stem simple or branched above; basal leaves 

 oblanceolate or spatulate, 1-8 cm. long, slightly toothed or entire; stem-leaves 

 lanceolate, cordately or sagittately clasping, usually sinuate-dentate, 2-8 cm. 

 long; petals 4-5 mm. long; pedicels 5-7 mm. long; pods 3-4 cm. long, 1 mm. 

 wide; style very short. A. hirsuta Hook., not Scop. Among rocks and in waste 

 places: N.B.Ga. Calif. Alaska. Plain Mont. My-Au. 



6. A. rupestris Nutt. Stems simple, hirsute, 3-5 dm. high; basal leaves 

 spatulate, 2-5 cm. long, sinuately toothed; stem-leaves lanceolate, cordate- 

 clasping; petals 6-10 mm. long; pedicels 5-10 mm. long; pod 4-6 cm. long, more 

 than 1 mm. wide. Dry places and among rocks: Sask. (? Colo.) Utah Ore. 

 Alaska. Submont. Ap-Je. 



7. A. Drummondii A. Gray. Stems simple and strict, 3-6 dm. high; basal 

 leaves oblanceolate, 2-4 cm. long, glabrous or somewhat pubescent; stem-leaves 

 lanceolate, sagittate-clasping, glabrous and glaucous; petals white or pink, 6-10 

 mm. long; pedicels 5-10 mm. long; pod 5-8 cm. long, 1.5-2 mm. wide; seeds 

 winged, in two rows. Streptanthus angustifolius Nutt. Turritis stricta Grah. 

 Arabis philonipha A. Nels. A. oxyphylla Greene. Mountains: Alta. N.M. 

 Utah. Submont. Subalp. My-Au. 



8. A. connexa Greene. Closely resembling the preceding and perhaps not 

 distinct, differing in the stronger and more branched caudex, spatulate basal 

 leaves, shorter, less acuminate stem-leaves, and broader pod, which is 5-8 cm. 

 long. Mountains: Alta. Colo. Utah. Mont. Je-Jl. 



9. A. albertina Greene. Stem 1-2 dm. high, glabrous, simple; basal leaves 

 oblanceolate, 1-2 cm. long; stem-leaves narrowly lanceolate, auriculate-clasping; 

 inflorescence short; petals purple or rose-colored, about 8 mm. long; pedicels 

 5-10 mm. long, erect; pod 2-6 cm. long, 2 mm. wide. A. Drummondii Wardii 

 A. Gray. Mountains: Alta. Wyo. Utah Wash. Submont. Mont. Jl-Au. 



10. A. Lyallii S. Wats. Perennial, with a branched caudex; stems 1-2 dm. 

 high, erect or ascending; basal leaves narrowly oblanceolate, the petioles ciliate; 

 stem-leaves few, lanceolate; petals purple, 7-8 mm. long; pedicels 5-10 mm. 

 long, ascending or rarely erect; pods 4-5 cm. long, 2 mm. wide. Mountains: 

 B.C. Mont. Calif. Submont. Subalp. My-Au. 



11. A. oblanceolata Rydb. Stem branched at the base, 3 dm. or more 

 high; basal leaves sparingly stellate-pubescent, oblanceolate, entire; stem-leaves 

 sessile, lanceolate, sagittate-auricled at the base; sepals white-hairy near the 

 apex; petals dark reddish purple, 7-8 mm. long; pods ascending, about 5 cm. 

 long and 2 mm. wide, glabrous; seeds in two rows. Mountains: Colo. Mont. 

 Subalp. S. 



12. A. oreophila Rydb. Stems 1-2 dm. high; basal leaves numerous, 

 broadly oblanceolate or spatulate, stellate-pubescent; petals yellowish white 

 below, upper portion rose or purplish; pods glabrous, 3-6 cm. long, slightly 

 arcuate; beak obsolete; seeds in two rows, winged above. Arabis Drummondii 

 alpina S. Wats., in part. A. oreocallis Greene. Mountains: Utah Wyo. 

 Mont. Mont. Subalp. 



13. A. microphylla Nutt. Stems erect, 1-3 dm. high; basal leaves oblance- 

 olate or spatulate, 0.5-3 cm. long, entire, stellate; sepals stellate; petals mostly 

 white, 5 mm. long; pedicels 5-10 mm. long, ascending; pods ascending, 2-4 cm. 

 long. Hills and mountains: Mont. Utah Ore. Wash. Submont. Mont. 

 Je-S. 



14. A. Crandallii B. L. Robins. Stems 2-4 dm. high; basal leaves nar- 

 rowly oblanceolate, 2-4 cm. long, densely stellate; stem-leaves lanceolate or 

 linear, slightly clasping; sepals stellate; petals 6 mm. long, white; pedicels 5-10 



