STREPTAr^THue. CRUCIFERiE. 77 



6. S. arcuatus (Nutt. ! mss.) : " hirsutcly villous with branrhincr iiairs ; 

 leaves lanceolate-linear, remotely serrulate ; cauline ones sagittate and clasp- 

 ing, very acute ; siliques flat and curved downward ; petals (purple) obovate, 

 exserted. 



" Shelving rocks, on high hills near St. Barbara, Upper California. — Stems 

 growing in dense tufts, very rarely branched, 1-2 feet high. Calyx purplish. 

 Petals deep reddish-puqjle. Anthers oblong. Siliques about 3 inches long, 

 glabrous. Seeds in a single (or partly in a double) scries, with a distinct 

 membranaceous margin." Nutt. — The siliques much resemble those of 

 Arabis Canadensis. The seeds are arranged horizontally, the radicle being 

 superior and lying across the axis of the silique. Funiculus free. Septum 

 opaque, marked with a broad longitudinal nerve ; areolae indistinct. 



§ 2. Petals narrow : calyx closed. — Eukusia, Nutt. mss. 



7. .S. glandulnsus (Hook.) : hirsute below ; leaves linear-oblong, repandly 

 toothed,°the teeth glandular ; radical ones petiolate, cauline deeply sagittate 

 and clasping ; flowers erect-spreading (purple), secund ; siliques very nar- 

 row, somewhat spreading, curved ; valves reticulated ; petals linear-lanceo- 

 late, undulate. — Hook. ! ic. t. 40. 



Monterey, Upper California, Douglas .'—'^ Stem 1-2 feet high, slender, 

 terete, the lower part scaly-hirsute. " The lowest leaves (which are often 

 withered) ])innatifid." Hook. Cauline ones 1-2-inches long, acute, remotely 

 toothed. Pedicels 2 lines long, thick. Flowers half an inch in length, dark 

 purple. Sepals ovate. Petals more than twice as long as the calyx. 

 Two of the longer stamens united. Sihque 3 inches in length and less than 

 a line broad, tapering at the summit into a very short style. Seed too young 

 in our specimens to show the embryo. 



8. S.fiavescens (Hook.) : hirsute with simple hairs; leaves linear-oblong, 

 the lowest ones sinuate-pinnatifid, or obtusely dentate with glandular teeth, 

 upper ones entire ; flowers erect (yellowish); petals linear, acute; siliques 

 (immature) erect, hirsute. — Hook. ! ic. 1. t. 44. 



Monterey, California, Douglas .'— (T) About a foot high, erect, simple. 

 Radical leaves nearly two inches long ; cauline scarcely an inch in length. 

 Raceme not secund.' Sepals ovate, obtuse. Petals nearly twice the length 

 ©f the calyx. Anthers linear-oblong. Silique pointed with a short style. 



9. S. repandus (Nutt. mss.) : " hirsute, particularly the lower part ; 

 leaves oblong-lanceolate, elongated, clasping, angularly toothed or repand 

 above (flowers white) ; petals about as long as the calyx. 



" St. Barbara, Upper California.— Stem simple, about 2 feet high. Pe- 

 dicels shorter than the calyx. Sepals and petals linear." Nutt. 



10. S. hpterophyllns (Nutt. ! mss.) : " hirsute below with simple hairs ; 

 leaves laciniate-pinnatifid, cauline ones sagittate at the base and clasping ; 

 flowers pendulous (purple) ; sepals long, connivent ; petals linear ; siliques 

 very long and narrow, pendulous. 



"Bushy hills, near St. Diego, Upper California.— (T) or (2) Stem 3- 

 5 feet high, branching ; the upper part glabrous. Calyx deep purple. Petals 

 purple and whitish, undulated, of the same breadth throughout. Siliques 3- 

 5 inches long, on pedicels 4 lines in length." Nutt. 



11. S. cordatus (Nutt. ! mss.): " glabrous; lower leaves spatulate-oblong, 

 repandly denticulate ; cauline ones cordate, clasping, all obtuse ; flowers on 

 short pedicels (greenish-yellow) ; siliques deflexed. 



" Forests of the Rocky Mountains. — Apparently perennial. Leaves very 

 obtuse, toothed near the summit ; cauline ones with a deep sinus embracing 



