70 CRUCIFERAE 



Parish 10,11G; Pan.imint Range (Contrih. IT. S. N.it. Herb. 4:61) ; Alabama Hills, Owons Lake, 

 S. W. Austin 434; Silver Canon, White Mts., Heller 8191; Tinnemaha Creek, Inyo Co., Almeda 

 Nordyke. Nev. : Truckee Pass, Virginia Mts., Waslioe Co., Kennedy 2055; Currant, Nye Co., 

 Georgia II. Bentlcy; Pyramid Lake, Kennedy 1986; Fallon, Churchill Co., Blanche Ross 19. 



Var. viridis Jepson var. n. Herbage puberulent but dark green; petals bright purple, 4 to 

 4^2 lines long; pods glabrous or nearly so. — (Ilerbae pubcrulae, atroviridos; potala luculcnto- 

 purpurea, lin. 4-4^> louga; siliquae glabrae vel glabratae.) — Dry or rocky soil, 1500 to 4000 

 feet, eastern San Diego Co.: summit of Mountain Springs grade, Jepson 11,810 (type); Box 

 Caiion, between Blair Valley and Mason Valley, Jepson 8702. 



Refs. — Arabis pulchra Jones; Wats. Proc. Am. Acad. 22:468 (1887), who cites specimens 

 from w. Nevada, Stretch, Shocklcy, Jones, and San Bernardino and San Diego Cos., Vasey, S. B. 

 4- W. F. Parish, W. G. Wright; Jepson, Man. 431 (1925). M. E. Jones first recognized and 

 named this species and indicated (in herb.) as the type his specimens {Jones 3764) from Empire 

 City, Ormsby Co., Nev., June 19, 1882. A. beckwithii Wats. Proc. Am. Acad. 22:467 (1887), as 

 to Parish 1302, Cushenbury Sprs., Mohave Desert. Var. veridis Jepson. 



19. A. perennans Wats. Nevada Rock-cress. Stems several, erect from a 

 usually branching and somewhat woody crown, 1 to lYo feet high; herbage stellate- 

 canescent, or stellate-puberulent and greenish, or glabrous above; leaves entire; 

 basal leaves in dense tufts, the blades of these and the lower cauline narrow- 

 oblanceolate, gradually contracted below to a commonly short petiole, the whole 

 % to 11/^ inches long; blades of cauline leaves linear to lanceolate, sessile, auricled 

 or not auricled; racemes rather loose; corolla pink, 3 to 3I/2 lines long; ovary gla- 

 brous or nearly so; pods slightly curved or sometimes straight, 1 to 2 inches long, 

 % to 1 line wide, glabrous to thinly puberulent, widely spreading or recurved on 

 pedicels 3 to 9 lines long; pedicels glabrous to puberulent; seeds in 1 or 2 rows, 

 orbicular, narrowly margined. 



Rocky slopes in the deserts, 2000 to 5000 feet : eastern Mohave Desert. East 

 to Utah and Arizona. Mar.-Apr. 



Tax. note. — In writing the diagnosis of A. perennans Wats, the author has, in contrast to 

 A. arcuata Gray, restricted the conception to the narrow-leaved eanescent or subcanescent plants 

 with the shorter type of pods (about 1 to 2 inches long), geographically absorbing only plants 

 of the deserts or desert slopes of the bordering ranges, and purposely excluding plants from 

 cismontane California which have pods 4 inches long or more. All specimens cited have pods 

 which are only slightly curved or are sometimes quite straight. We have thus far met no speci- 

 mens of A. perennans vrithout question collected in cismontane Southern California. 



Locs. — Ord Mt., Mohave Desert, Jepson 5884; Bonanza King Mine, Providence Mts., Mum 

 4625; Hanaupah Canon, Panamint Range, Jepson 7053. 



Var. longipes Jepson comb. n. Stems 2 to several, 7 to 14 (or 16) inches high, from the 

 loosely branched crown of a perennial root, hairy-pubescent below, glabrous above; blades of 

 basal leaves obovate to oblanceolate, dentate, drawn down to a petiole at base, thinly pubescent, 

 the whole % to 1% inches long; blades of cauline leaves oblanceolate or the upper ones oblong 

 to lanceolate, sessile; petals 3 lines long, the purple blade very narrow; pods glabrous, 1^/4 to 

 2Y2 inches long, spreading on very slender glabrous pedicels % to 1 inch long; seeds in one 

 row. — Rocky slopes of canons, 1800 to 5000 feet : mountains on west border of Colorado Desert ; 

 ranges of the eastern Mohave Desert and of Inyo Co. East to Arizona. Mar. 



Tax. note. — On account of its general habit and similarity in inflorescence and pods this 

 form, var. longipes, is too closely related to A. perennans Wats, to secure specific rank. It is 

 commonly distinguished by the broader often coarsely toothed leaves of the basal tufts and by 

 the thread-like pedicels. Its pods are short as compared with those of A. arcuata. The flowers 

 are rather smaller than those of A. pulchra and the petal limbs are narrow. 



Locs. — Box Canon, Blair Valley, e. San Diego Co., Jepson 8649 ; Coyote Canon, Santa Rosa 

 Mts., Jepson 1454; Providence Mts., T. Brandegee ; Barnwell, New York Mts., K. Brandegee ; 

 Hanaupah Canon, Panamint Range, Jepson 7092 (dwarf of rock cliffs). 



Refs. — Arabis perennans Wats. Proc. Am. Acad. 22-A67 (1887), type loe. n. Nevada, the 

 first station cited; Jepson, Man. 431 (1925). Var. longipes Jepson. A. arcuata var. longipes 

 Wats.; Gray, Syn. Fl. 1^:164 (1895), type loc. Fort Mohave, Ariz., Lemmon. A. gracilipes 

 Greene, Pitt. 4:193 (1900), type loc. Flagstaff, Ariz.; Jepson, Man. 431 (1925). 



20. A. suffrutescens Wats. Purple Rock-cress. Stems several, 7 to 14 inches 

 high, from a branching woody caudex ; herbage glabrous, or the basal leaves sparsely 

 ciliate; blades of basal leaves oblanceolate, of the cauline lanceolate, the lower 



