MUSTARD FAMILY 307 



13. Arabis blepharophylla Hook. & Arn. Coast Rock-cress. Fig. 2109. 



Arabis blepharophylla Hook. & Arn. Bot. Beechey 321. 1S40. 



Perennial with a simple or short-branched caudex, the stems few or several, 1-3 dm. high, 

 glabrous or sometimes sparingly hirsute below with forked hairs. Basal leaves oblong to 

 spatulate, 3-5 cm. long, ciliate on the margin with forked hairs, dentate or entire ; stem leaves 

 few, oblong, sessile ; petals rose-colored, 10-12 mm. long, fragrant ; sepals often colored, un- 

 equal, one pair gibbous and broader ; fruiting pedicels stellate, 4-8 mm. long ; pods erect or 

 nearly so, 20-25 mm. long, about 2 mm. broad, abruptly beaked by a short stout style; seeds 

 round-elliptic, narrowly winged or scarcely margined. 



Rocky hillsides, mainly Upper Sonoran Zone; near the coast from Marin County to Monterey County, 

 California. Type locality: central California, probably San Francisco. March-April. 



14. Arabis purpurascens Howell. Purple Rock-cress. Fig. 2110. 



Arabis purpurascens Howell ex Greene, Pittonia 1: 161. 1888. 



Arabis furcata var. purpurascens S. Wats, in A. Gray, Syn. Fl. N. Amer. I 1 : 161. 1895. 



Perennial from a very slender rootstock, the flowering stems solitary or few, simple, 20-35 

 cm. high, sparsely pubescent with mostly 2-forked hairs. Basal leaves broadly oblanceolate to 

 obovate, 2-7 cm. long, 8-20 mm. wide, narrowed to a petiole ; entire or remotely toothed, rather 

 sparsely pubescent with mostly 3-forked hairs; stem leaves several, oblong-elliptical, 15-50 mm. 

 long, sessile, not cordate or auriculate, entire or saliently toothed, pubescent ; racemes many- 

 flowered; pedicels 5-12 mm. long, slender, pubescent; sepals purple, 5 mm. long, sparsely 

 pubescent; petals purple, 12-15 mm. long; pods erect; pod 5 cm. long, slightly over 1 mm. broad, 

 acute at apex, glabrous. 



Rocky hillsides, Transition and Canadian Zones; Cascade and Siskiyou Mountains, Jackson County, 

 Oregon. Type locality: rocky hillsides, Ashland, Oregon. May-July. 



15. Arabis Lyallii S. Wats. Lyall's Rock-cress. Fig. 2111. 



Arabis Drummondii var. alpina S. Wats. Bot. King Expl. 17. 1871. 



Arabis Lyallii S. Wats. Proc. Amer. Acad. 11: 122. 1876. 



Arabis Drummondii var. Lyallii Jepson, Man. Fl. PI. Calif. 429. 1925. 



Perennial with a loosely branched caudex, the stems several, 5-30 dm. high, slender, glabrous 

 throughout. Basal leaves spatulate to linear-oblanceolate, 15-60 mm. long ; stem leaves narrowly 

 lanceolate to oblong, sometimes scarcely auricled ; sepals glabrous ; petals rose-colored, 4-6 mm. 

 long; pods erect or ascending, straight; 25-50 mm. long; about 2 mm. wide, narrowed to a 

 short style; seeds in 1 row, orbicular, narrowly winged. 



Alpine summits, Arctic-Alpine and Hudsonian Zones; British Columbia and western Montana to the Cas- 

 cades and Blue Mountains, Oregon. Type locality: Ashnola River, Cascade Mountains, Washington. July-Sept. 



The following species proposed by Greene (Leaflets Bot. Obs. 2: 75-76. 1910) are synonymous: Arabis 

 multiceps, A. armerifolia, and A. densa. 



16. Arabis Drummondii A. Gray. Drummond's Rock-cress. Fig. 2112. 



Turritis stricta Graham, Edinb. New Phil. Journ. 1829: 350. 1829. Not Arabis stricta Host. 1827. 



Streptanthus angustifolius Nutt. in Torr. & Gray, Fl. N. Amer. 1: 76. 1838. Not Arabis angustifolius 

 Lam. 1783. 



Arabis Drummondii A. Gray, Proc. Amer. Acad. 6: 187. 1864. 



Biennial or rarely perennial, somewhat glaucous, glabrous or sparsely stellate-pubescent, 



with 2-3- forked hairs, the stems 1 to several, erect, 3-6 dm. high. Basal leaves narrowly 



oblanceolate, 2-5 cm. long, more or less pubescent with 2-forked appressed hairs ; stem leaves 



linear-lanceolate to oblong, 2.5-5 cm. long; sepals narrow, 3-4 mm. long; petals white or pale 



rose, 6-8 mm. long ; pods erect, crowded, 35-75 mm. long, 2-3 mm. wide ; style obsolete ; seeds 



broadly elliptical, winged on the lower end and sides. 



In rocky places, Boreal Zones; British Columbia and Alberta to California and New Mexico. Type locality: 

 Rocky Mountains. June— Aug. 



The following species proposed by Greene are synonymous: Arabis oxvphylla and A, connexa (Pittonia 4: 

 196-197. 1910); Arabis nemophila and A. interposita (Leaflets Bot. Obs. "2: 78. 1910). 



17. Arabis Bolanderi S. Wats. Bolander's Rock-cress. Fig. 2113. 



Arabis Bolanderi S. Wats. Proc. Amer. Acad. 22: 467. 1887. 



Biennial, the stems solitary, 3-5 dm. high, branched above, with ascending branches, stellate- 

 pubescent, becoming glabrous or nearly so above. Basal leaves narrowly oblanceolate, petioled, 

 the margins revolute; stem leaves lanceolate, 2-4 cm. long, more or less auriculate at base, 

 usually stellate-pubescent; racemes many-flowered, divergent or somewhat recurved; sepals 3 

 mm. long, pubescent ; petals 5 mm. long, rose-colored ; fruiting pedicels divergent or somewhat 

 recurved, 3-4 mm. long, pubescent or glabrate ; pods straight, divergent or slightly reflexed, 2-3 

 cm. long, 1 mm. wide ; seeds broadly elliptical, narrowly winged, somewhat in 2 rows. 



Mountain slopes, Arid Transition Zone; central Sierra Nevada, California. Apparently a local species 

 and seldom collected. Type locality: Big Trees, Yosemite National Park. May-July. 



18. Arabis acutina Greene. Sharp-podded Rock-cress. Fig. 2114. 



Arabis acutina Greene, Leaflets Bot. Obs. 2: 82. 1910. 



Short-lived perennial, stems few from the crown of a rather slender taproot, erect and 



