164 CRUCIFER^. Arabis. 



A. Holbdellii, Hornem. Biennial, very finely stellate-pubescent below or throughout : 

 stems simple or branched, one or more, erect or ascending, ^ to 2| feet high : radical leaves 

 narrowly ohlauceolate, entire, an inch long or less; cauline leaves linear-oblauceolate to 

 narrowly oblong, acutely sagittate : flowers becoming more or less reflexed and secund on 

 pubescent pedicels : petals 3 lines long : pods more or less abruptly reflexed, straight or 

 somewhat curved, 1^ to 2^ inches long by nearly two thirds line broad; valves 1 -nerved 

 to the middle; stigma sessile; seeds in one row, orbicular, winged. — Tl. Dan. t. 1879. 

 A. retrofracta, Grab. Edinb. New Phil. Jour. 1829, 344. ? A.declinata, heteromalla, & lilacina, 

 Schrad. Ind. Sem. Hort. Gutt. 1831, 1832, & Linnrea, viii. 1833, Lit.-Ber. 22, 25. Turritis 

 retrofracta, Hook. Fl. Bor.-Am. i. 41. 1 Streptanthus virgatus, Nutt. in Torr. & Gray, Fl. i. 

 76.i — Rocky Mountains from N. Colorado, Wolf, Vasey, to N. Idaho, Li/all, and Brit. 

 America, Drummond, Bourgeaii, Macoun. (Greenland.) 



Var. C?) patula, Watson, n. var. More glabrous, only the lower leaves and stem 

 pubescent and the petioles somewhat ciliate : leaves sometimes toothed : pods somewhat 

 broader and the seeds more evidently in two rows. — Turritis patuJa, Grah. 1. c. 350 ; Hook. 

 Fl. Bor.-Am. i. 40, excluding the more western localities. — Bepresented in herb. Gray only 

 by specimens collected by Bourgeau in the Rocky Mountains of Brit. America, and on the 

 Saskatchewan. A. Columbiana, Macoun, Cat. Canad. PI. ii. 304, however, of Brit. Colum- 

 bia, Macoun, and N. Washington, Piper, scarcely differs. 



Var, Fendleri, Watson, n. var. Stems often several and ascending from a biennial 

 root, a foot high, hirsute below with simple or branched hairs, glabrous above : lower leaves 

 roughly stellate-pubescent and petioles ciliate ; the upper glabrous : pods somewhat curved. 

 — From Colorado, Parry, no. 94, Hall & Harbour, no. 36; N. Nevada to New INIexico, 

 Fendler, no. 27 , Palmer, Rush y ; and California, Tulare Co., CoviUe & Funston, no. 1388. 

 (Chihuahua, Wright, no. 1313.) 

 A ■ arcuata, Geay. Biennial or sometimes perennial, roughly stellate-pubescent through- 

 out ; stems usually simple and erect, 1 to 2 feet high : radical leaves narrow- or linear- 

 oblanceolate ; tlie petioles often ciliate, 1 to 2 inches long ; the cauline linear-lanceolate, all 

 somewhat toothed or entire : petals 3 to 6 lines long, more or less deeply rose-colored, more 

 or le.ss widely spreading : pods arcuate, 2 to 3 inches long by a line wide or somewhat more, 

 acute, on divaricate or recurved usually pubescent pedicels 3 to 6 lines long; stigma nearly 

 sessile; seeds orbicular, narrowly winged, as broad as the valves. — Proc. Am. Acad. vi. 187. 

 Streptanthus arcuatiis, Nutt. in Torr. & Gray, Fl. i, 77. — California, from Placer Co. to 

 Santa Barbara and the San Bernardino Mountains.^ To this typical form it appears neces- 

 sary to add the following closely united varieties, which have been variously referred to 

 A. Holba^llii, patula, & retrofracta. 



Var. SUbvillosa, Watson, n. var. Biennial or rarely perennial, more glabrous 

 above, the pubescence especially of the lower leaves stellate, but with more or less of spread- 

 ing mostly simple hairs, usually sparse above on the leaves, stem, pedicels, and calyx, but 

 occasionally abundant on the pedicels. — ? A. sparsiflora, Nutt. in Torr. & Gray, Fl. i. 81.— 

 N. Nevada and Oregon to Washington and W. Idaho. A low several-stemmed specimen 

 from Downieville, Calif., Bigeloir. 



Var.* secunda, RoniNSON, n. var.3 Resembling var. snhvillosa but less villous, slender ; 

 the stem ( 1 to 2 feet high) usually single from a base of two or more years' growth : flowers 

 often pale and smaller: pods 1^ to 2 inches long. — ^. secunda, Howell, Erythea, iii. 

 33. _ Washington, Mt. Adams, Suksdorf Howell, Upper Yakima, Lyall. Approaching 

 A. perennans. 



Var. longipes, Watson, u. var. Tall, biennial, glabrous above ; the stem spreading- 

 villous toward the base and lower leaves somewhat stellate-pubescent -. sepals glabrous or 

 hairy toward the top: petals pale, 3 lines long: pedicels glabrous, becoming elongated 

 (1 to 2 inches long or less). — California, near Fort Mohave, Lemmon, 1884. 



1 A number of forms, all ascribed to this variable species, have been described by Miss A. East- 

 wood, Zee, iv. 5, 6. 



2 And southward into Lower Calif., ace. to Brandegee, Proc. Calif. Acad. Sci. ser. 2, ii. 126. 



3 This variety, distinguished and given a manuscript name by Dr. Watson, has since been described 

 by Mr. T. Howell as A. secunda. This name is here used in preference to Dr. Watson's to avoid 

 ]mblishing a second unnecessary designation. Of the varietal rather than the specific rank of the 

 plant there can be no doubt. 



