MUSTARD FAMILY 99 



34. THYSANOCARPUS Hook. 



Slender erect annuals with the stems commonly sparingly branched or often 

 simple. Flowers minute, white or purplish. Sepals ovate, spreading. Petals spat- 

 ulate. Stamens 6, subequal, with slender filaments. Ovary 1-celled, 1-ovuled, be- 

 coming an indehiscent fruit. Pod much flattened and winged, orbicular in outline, 

 the body disk-shaped or plane on one side and convex on the other, the wing entire 

 or toothed, with or without radiating nerves ("rays"), or with small holes or per- 

 forations. — Species about 5, western North America. (Greek thusanos, fringe, 

 and karpos, fruit.) 

 Fruiting pedicels more or less recurved their whole length ; rays of the wing broad. 



Leaves oblong-lanceolate to linear, the basal rosulate, pinnatifid or toothed 1. T. curvipes. 



Leaves linear to oblong-linear, the basal entire or with divaricate salient segments, not rosu- 

 late 2. T. laciniatus. 



Fruiting pedicels straight or recurved only at tip; rays of the wing linear 3. T. radians. 



1. T. curvipes Hook. Fringe-pod. Slender, 1 to II/2 feet high, more or less 

 pubescent or hirsute; blades of cauline leaves linear or lanceolate, sessile and auri- 

 cled at base, the upper entire, the lower dentate or denticulate; basal leaves often 

 narrowed at base to a petiole, the blades commonly sinuate-pinnatifid, with tri- 

 angular acute or acuminate lobes; pods obovate, varying to round-obovate, pubes- 

 cent or glabrous, l^^ to S^^ lines long, often very convex on one side; wing narrow, 

 rather crowded with broad rays, entire. 



Open hill country, 100 to 5000 feet : cismontane region, widely distributed and 

 everywhere frequent for the most part. North to British Columbia and Idaho. 

 Mar.-May. 



Note on variation. — The wings of the fruit in this species are usually non-perf orate, but 

 plants are not infrequently found in which some of the fruits exhibit slightly perforate wings 

 (as in Corral Hollow, May Arnold) or mainly perforate (Yosemite, Jepson 10,451). While fruits 

 with broad conspicuously perforate wings characterize the var. elegans Eob., this variety, per con- 

 tra, sometimes exhibits non-perforate wings, or wings with merely translucent spots. 



Locs. — Sierra Nevada: Auburn, Sonne; Freeport, Sacramento Co., Bolander 4505 ; Pine Log, 

 South Fork Stanislaus Eiver, A. L. Grant 702; Italian Bar, Tuolumne Co., A. L. Grant 12a; 

 Yosemite "Valley, Jepson lOOf; Kinsley, Mariposa Co., Charlotte HoaTc; Pinehurst, near Mill- 

 wood, Fresno Co., Newlon 196 ; ISear Mt., Tehachapi Mts., Jepson 7164. Coast Eanges: Dunsmuir, 

 Siskiyou Co., Heller 7931; Anderson, Shasta Co., Alice King; Gasquet, Del Norte Co., Howell 

 1412 ; Klamath River, Humboldt Co., Chandler 1444 ; Weaverville, Yates 106 ; Van Duzen River 

 vaUey, opp. Buck Mt., Humboldt Co., Tracy 4092; Mad Eiver Valley, Trinity Co., Tracy 4304; 

 Paskenta, sw. Tehama Co., Jepson 16,327; Scotts Valley, Lake Co., Tracy 1739; Calistoga, Jepson 

 27d; St. Helena, Jepson 30e; Mt. George, Napa Co., Jepson 30d; Peaceful Glen, nw. Solano Co., 

 Jepson 9626; Vacaville, Jepson 26c; Gates Canon, Vaca Mts., Jepson 26d; Mt. Tamalpais, Jep- 

 son 7561; Arroyo Mocho, Alameda Co., J. T. Howell 818; Smith Creek, Mt. Hamilton, B. J. 

 Smith; Livermore, Jepson 28d; Guadalupe Mine, Santa Clara Co., Jepson 9089; San Miguel, 

 Jepson 8439; Zapato Chino Creek, sw. Fresno Co., Jepson 15,373; Fort Tejon, Davj 2359. S. 

 Cal.: Saugus, Davy; Arroyo Seco (hills w.), Peirson 388; Monrovia Canon, San Gabriel Mts., 

 J. T. Howell 3767 (rays very narrow) ; San Bernardino, Parish; Saunder Mdw., San Jacinto Mts., 

 C. V. Meyer 182; Santa Cruz Isl., Frida Sexauer (some fruits with perforate wings). 



Var. elegans Eob. Lace-pod. Stem rather stout, with few branches, 14 to 30 inches high ; 

 blades of lower leaves repand-toothed or entire; pods nearly orbicular, 3 to 4^/^ lines long, the 

 body densely tomentose or glabrous; wing vnth large ovoid perforations between the rays (or 

 sometimes non-perforate), the margin membranous and entire. — Foothills throughout cismon- 

 tane California. 



Locs. — Sierra Nevada foothills: Alder Creek near Folsom, Alice King; Linden, Gunnison; 

 Knights Ferry, F. W. Bancroft; Bootjack, Mariposa Co., Jepson 12,781, 12,791; Table Mt., Fresno 

 Co., Jepson 15,124; Old Colony Mill, Sequoia Park, Jepson 620. Great Valley: Eedding, BlanTcin- 

 ship; Crane Creek, Tehama Co., Jepson 30g; College City, Alice King (wing non-perforate but with 

 translucent spots); Marysville Buttes, Jepson; Stockton, Sanford 195. Coast Ranges: Round 

 Valley, ne. Mendocino Co., Goddard 620 ; Long Valley, Mendocino Co., Jepson 2198a ; Scotts Val- 

 ley, Lake Co., Tracy 1655 ; St. Helena, Jepson 9895 ; Walker Canon, Vaca Mts., Jepson 30j ; Sum- 

 merville. Contra Costa Co., Chesnnt # Drew; Mt. Diablo, Jepson 5g, 9666 (wing non-perforate) ; 

 Brentwood, Linda Gehringer ; Mt. Hamilton, E. J. Smith; San Martin, Santa Clara Co., Chand- 

 ler 900 ; Santa Margarita, Jepson 11,977. S. Cal. : Manzana, Antelope Valley, Davy 2540 ; Escon- 

 dido, C. V. Meyer 102; Cuyamaca. 



