MUSTARD FAMILY. 225 



Hillsides and valleys of the inner Coast Ranges from Colusa Co. 

 to Livermore Valley and southward. Apr. 



17. THYSANOCARPUS Hook. 



Slender erect annuals, with the stems commonly sparingly 

 branched or often simple, and minute white or purplish flowers. 

 Sepals ovate, spreading. Petals spatulate. Stamens 6, subequiil, 

 with slender filaments. Ovary 1-celled, 1-ovuled, becoming an in- 

 dehiscent fruit; this much flattened and winged, orbicular in outline, 

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

 the wing with small perforations or with radiating nerves or toothed. 

 (Greek thusanos, fringe, and karpos, fruit). 



Fruiting pedicels more or less recurved their whole lengtli. 

 Wing ot tlie obovate fruit with radiating nerves, mostly imperforate . . . 



1. T. cnrvipes. 



Wing of the commonly roundish fruit perforated 2. T. elegans. 



Wine of fruit scarious, not perforated, the radiating nerves none or very 



snort , 3. r. emarginatus. 



Fruiting pedicels straight or recurved only at the very tip; wing broad with 

 conspicuous rays .4.T. radians. 



1. T. curvipes Hook. Fkinqe-pod. llure or less pubescent or 

 hirsute, 10 to 20 in. high; cauline leaves linear or lanceolate, sessile 

 and auricled at base, the upper entire, the lower dentate or denticu- 

 late; radical leaves often narrowed at base to a petiole, commonly 

 sinuate-pinnatifld, with triangular acute or acuminate lobes; fruit 

 obovate varying to round-obovate, pubescent or glabrous, IJ to 3 lines 

 long, often very convex on one side; wing narrow, rather crowded 

 with broad rays; pedicels recurved. 



Frequent ever\'where in the open hill country of California. Apr.- 

 May. Pods in the same raceme sometimes either pubescent or gla- 

 brous, indifferent of age. Passing into the next by numerous grada- 

 tions, of which T. hirtellus Greene is one. 



2. T. elegans F. &M. Lace-pod. Eather stout, with few 

 branches; lower leaves repand-toothed ; fruit nearly orbicular, 3 to 

 4 lines long, the body densely tomentose; wing with large ovoid 

 perforations between the rays, the margin membranaceous and entire. 



Middle North Coast Ranges; Antiooh; Sierra Foothills. 



3. T. emarginatus Greene. Freely branching from the base, IJ 

 ft. high; herbage ostensibly glabrous but the plant at the fruiting 

 stage hispidulous under a lens, at least on the lower parts; cauline 

 leaves linear, lanceolate, sessile, not auricled; flowers and radical 

 leaves unknown; fruit 2 to 2J lines long, glabrous; the wing scarious, 

 entire, destitute of radiating nerves or these very short, sometimes 

 deeply, always slightly emarginate at the apex. 



Mt. Diablo, Jrpxon; Antioch, Miss Eu.ifmood. Evidently passes 

 into T. curvipes. 



4. T. radians Benth. Erect, commonly 1 to IJ ft. high and 

 rarely branching; radical leaves runcinate-pinnatifld; cauline ovate- 

 lanceolate, auriculate-clasping; fruit orbicular, 4 lines broad, glabrous 



17 



