98 CRUCIFERAE 



Var. SAXIMONTANA O. E. Schulz; Englcr, Pflzr. 4"»:99 (1927). P. saximontana Nels. Bull. 

 Torr. Club 27 : 264 (1900), tvpe loc. Laramie plains, Wyo., Nelson 4323. Var. pectinata Jepson. 

 D. fjlocialis var. pectinata Wats. Proc. Am. Acad. 23:260 (1888). D. densifolia Nutt.; T. & G. 

 Fl. 1:104 (1S3S), type loc. n. Kocky Mts., Nuttall. 



13. D. douglasii Gray. Alkali Draba. Flowering stems several to many, 

 V-; to 1 inch liiirh. arisinpr from a branched and densely leafy root-crown; leaf-blades 

 very narrowly oblanceolate, acute or acuminate, firm or even somewliat cartila- 

 jrinous, pubescent, or glabrate except the ciliate margins, 3 to 6 lines long; petals 

 white; pods ovate, acuminate, 11/2 to 2 lines long, pubescent with simple hairs; 

 valves becoming strongly convex; style slender, 14 to 1 line long; ovules 2 (rarely 

 4) in each cell, jiendent from near the apex of the cells; seeds large. 



Alkaline or wet places in high mountains, 5000 to 7000 feet, rare : San Bernar- 

 dino l\lts.; Sierra Co., Sierra Nevada. Nevada to Washington. Apr. 



Ijocs. — Bear Valley, San Bernardino Mts., Parish 1792 ; Siorraville, Lemmon, 



Refs. — Draba douglasii Gray, Proc. Am. Acad. 7:328 (1868), typo loc. divide between East 

 Carson and West Walker rivers, Anderson. Braya oregonensis Gray, Proc. Am. Acad. 17:199 

 (1882), tj'pe loc. Union Co., Ore., Cusick ; Parish, Erythea 3:60 (1895). D. crockeri Lemmon, 

 Bull. Torr. Club 16:221 (1889), type loc. Sierra Valley, Lemmon. 



33. ATHYSANUS Greene 



Low annual, leafy below, the short stem divided at or near the base into few 

 or many simple elongated filiform branches or racemes which are unilaterally 

 flower-bearing throughout. Herbage pubescent with 2 to several-forked spreading 

 hairs. Flowers minute, promptly reflexed or recurved. Petals linear or none. 

 Stamens 6, nearly or quite equal; filaments slender. Pod small, orbicular, indehis- 

 cent, or dehiscent only after falling, 1-celled, or 2-celled by a thin partition, wing- 

 less; cotyledons accumbent. — Species 1, Pacific Coast of North America. (Greek 

 a-, without, and thusanos, fringe, the fruit wingless, the type species taken out of 

 the genus Thysanocarpus, the fruit of which is broadly margined.) 



1. A. pusillus Greene. Plants 4 to 12 inches high; branches ascending; ra- 

 cemes 3 to 9 inches long; leaf -blades broadly oblong, entire or with 1 to 3 coarse 

 teeth on each side, 2 to 5 (or 12) lines long; flowers % line long, on pedicels twice 

 as long; ovary 1-celled; ovules 2 to 4, only one maturing, that attached at base of 

 the pod; fruiting pedicels recurved, 1 to 3 lines long; pods orbicular, strongly 

 flattened, % to 1 line long, hispid all over with hooked hairs. 



Gravelly plains and foothills, 50 to 4000 feet : cismontane Southern California; 

 Sierra Nevada from Fresno Co. to Modoc Co.; Coast Ranges from southwestern 

 Fresno Co. to Trinity Co. ; Sacramento Valley. Northerly to British Columbia and 

 Idaho. Common. Apr.-May. 



Note on variation. — Plants \vith pods that are glabrous, or ciliate on the margins with gla- 

 brous faces, are sometimes found growing in shade in the San Francisco Bay region. A collec- 

 tion of specimens made in the Berkeley Hills, Tracy 1346, has among them plants with some pods 

 hirsute, some ciliate only, and others glabrous, all on one individual. 



Locs. — S. Cal. : San Diego, K. Brandegee; Laguna Mts., Peirson; Eamona, San Diego Co.; 

 Hot Springs Mt., near Warners Hot Sprs., Jepson 8740; San Bernardino, Parish; Mt. Wilson, 

 Peirson 60a (racemes not unilateral) ; Santa Cruz Isl. Tehachapi Mts.: Kowen, Jepson 6714. 

 Sierra Nevada: Pine Eidge, Fresno Co.; Vernal Fall, Yoseinite, Jepson 10,458; Rough and 

 Ready, Nevada Co., Jepson 13,394; lava beds, Modoc Co., B. M. Austin. Coast Ranges: Zapato 

 Chino Creek, sw. Fresno Co., Jepson 15,369; Halls Valley, Mt. Hamilton Range, Jepson 8240; 

 Corral Hollow, Jepson 9584; San Francisco, Greene; Berkeley, Jepson 13,393; Antioch; Laguni- 

 taa, Marin Co., Eastwood; Yaca Mts., Piatt; Lodoga, w. Colusa Co., Jepson 16,277; Ukiah, 

 Purdy; Mail Ridge, s. Humboldt Co., Jepson 1901; Southfork Mt., w. Trinity Co., Jepson 16,658. 

 Sacramento Valley: College City, Alice King; Rosewood, Tehama Co., Jepson 178d; Anderson, 

 Shasta Co., Alice King ; Palo Cedro, Shasta Co., Blanhinship. 



Refs. — Athysanus pusillus Greene, Bull. Cal. Acad. 1:72 (1885); Jepson, Fl. W. Mid. 

 Cal. 224 (1901), ed. 2, 190 (1911), Man. 446, fig. 437 (1925). Thysanocarpus pusillus Hook. Ic. 

 PI. 42 (1836), type loc. "Monterey," Douglas. A. pusillus var. glabrior Wats.; Gray, Syn. Fl. 

 l':113 (1895), type loc. Ft. Mohave, Ariz., Lemmon, fruit glabrous but ciliate on the margins. 



