144 CRUCIFERiE. Erysimum. 



polymorphous species, incapable, however, of satisfactory division eveu into varieties. The 

 form of the leaves, pubescence, color of the flowers, and dimensions of every part exhibit 

 in specimens from different localities the most striking differences, but the variation of each 

 part is sliowu in a long series of specimens to be thoroughly independent of every other so 

 that varieties could have no more tlian formal value. Only two noteworthy forms need be 

 mentioned: var. Arkansanu.m, Gray (Man. ed. 5, 69; £. Arkansanum, Nutt. in Torr. & 

 Gray, Fl. i. 95 ; Gray, Gen. 111. i. 150, t. 63), with leaves thin, lanceolate, and repand-dentate, 

 and var. pumilum, Porter & Coulter (PI. Col. 8 ; E. pumilum, Nutt. 1. c), a very small alpine 

 form, 2 to 6 inches high, with entire or subentire leaves; possessing, however, no other 

 satisfactory difference from the taller form with which it intergrades. 



E. insulare, Greene. Suffrutescent, pubescent with very minute 2-pointed hairs : stem 

 stout, sharply angled, decumbent, profusely branched : leaves linear, crowded, attenuate and 

 often recurved at the tip, 1 ^ to 2^ inches long : inflorescences short ; pedicels in fruit stout, 

 somewhat angulate, divaricate, 5 to 8 lines long; capsule erect, about 2 inches long, abruptly 

 contracted to a short style ; j^artition a line in breadth ; valves sharply carinate ; stigma 

 disk-sliaped ; cotyledons often oblique or nearly accumbent. — Bull. Torr. Club, xiii. 218; 

 Brandegee, Proc. Calif. Acad. Sci. ser. 2, i. 207. — Cuyler's Harbor, San Miguel Island off 

 S. California, Greene; Santa Rosa Island, Brandegee ; fr. June. 



* * * Flowers large or medium sized : petals yellow or orange (in E. arenicola unksown) • 

 pods more strongly flattened parallel to the broad partition; valves 1 -nerved or somewhat 

 keeled. 



-K- Cotyledons obliquely incumbent : capsule very gradually narrowed to a beak. 



Ej. arenicola, Watson. Cespitose perennial with densely multicipital caudex : stems 

 several, terete, 6 to 8 inches high : leaves cliiefly clustered at the base, very numerous, 

 oblanceolate, repandly denticulate, including petioles only 1| inches long, 2 to 3 lines wide, 

 pubescent with white appressed 2-3-poiuted hairs : racemes short, rather few-flowered ; 

 pedicels 2 lines in length, .spreading: sepals 4 lines long. — Proc. Am. Acad. xxvi. 124. — 

 Olympic Mountains, Washington, 5,000 feet alt.. Piper ; f r. September. 



-I— H— Cotyledons accumbent : capsule rather abruptly contracted to a beak. 



B. grandiflorum, Ndtt. Biennial or perennial, erect, leafy, finely pubescent with ap- 

 pressed 2-parted hairs: stem 3 inches to 2 feet high, somewhat angled, becoming stout, 

 simple or less frequently l)ranched, sometimes from the base : leaves oblong, oblanceolate, or 

 spatulate to linear, attenuate below, quite entire or more or less deeply repand-dentate : 

 flowers at fir.st subcapitate ; raceme elongating, in fruit sometimes a foot or more in length ; 

 pedicels variable, 2 to 8 lines long : petals about an inch in length, light yellow (rarely 

 white), with broad rounded blade : capsules 1^ to 4 inches long, 1| to H lines broad ; valves 

 flattish, 1-nerved; style | to 1 line long, .stout ; stigma usually rather broad ; seeds brown, 

 oblong, sometimes margined but not winged. — Nutt. in Torr. & Gray, Fl. i. 96, 667. 

 E. capitatum, Greene, Fl. Francis. 269. Cheiranthus asper, Cham. & Schlecht. Linuiea, i. 14, 

 excl. syn. C. capitatus, Dougl. in Hook. Fl. Bor.-Am. i. 38. — A maritime and saline species 

 of the Pacific Coast, from the salt-works of Los Angeles Co., Calif., Mrs. Bush, and Santa 

 Rosa Island, Brandegee, northward to Curry Co., Oregon, Howell ; common. The recently 

 published E. Californicum, Greene, Erythea, iii. 69, not seen by the writer, is a nearly 

 related (if not identical) species, not differing by satisfactory characters so far as described. 



E. OCCidentale, Robinson, n. sp. Erect annual or biennial, 2 inches to 1| feet high, 

 finely pubescent with appressed 2-pointed hairs : stem liecoming stoiit, angulate : leaves nar- 

 rowly linear to lance-linear, acute, attenuate to long slender bases, entire or nearly so : 

 floral rhachis at first very short l)ut becoming in fruit 4 to 6 inches in length, often branched 

 below; pedicels .stout, spreading, 2 to 4 lines long: petals lemon-yellow to deep orange, 8 to 

 10 lines long, much exceeding the pale narrowly oblong strongh' saccate calyx : capsule 3 

 to 4 inches long, 1-J- lines broad, beaked with a .slender style (2 lines in length); stigma 

 small; seeds oblong, rather broadly winged. — E. asperum, var. pumilum, Wats. Bot. King 

 . Exp. 24. Cheiranthus occidentalis, Wats. Proc. Am. Acad, xxiii. 261. — Sandy soil, Carson 

 City, Nevada, Watson, to Oregon, Henderson, and Washington, Li/nll, Suhsdorf; fl. April 

 to June. Readily distinguished from E. asperum by its broad flat pods, from E. grandiflorum 

 by its long style and narrow leaves. 



