MUSTARD FAMILY. 



228 



Plants, when robust, with mostly straggling branches; pods 2-valved and 



Two-celled 1. T. gracile. 



One-celled, but the partition persistent above 2. T. dubium. 



Plants commonly erect ; pods 4-valved and 1-celled . . . . 3. T. capparidriun. 



1. T. gracile Hook. Erect or at last very diffuse; leaves pinnati- 

 fid, the segments commonly linear, acutish, cleft or entire; leaves of 

 the inflorescence similar but reduced; pedicels axillary, 3 to 10 lines 

 long, spreading; stamens very unequal; pods linear, strongly obeom- 

 pressed throughout, tardily dehiscent; style slender; seeds in 2 rows. 



On or near low hills of the inner Coast Kanges from Tehama Co. 

 and the Marysville Buttes southwestward to Vaeaville, Mt. Diablo 

 and Southern California. 



2. T. dubium Davidson. Decumbent, the branches 6 to 12 in. 

 long; radical leaves regularly pinnatitid with 3-toothed segments, 

 petioled, 2 to 3 in. long; cauline leaves mostly sessile with linear seg- 

 ments; stamens tetradynamous, but not markedly unequal; pedicels 

 said to be arcuate; pods \ to 1£ in. long, 1 line wide, only the upper 

 portion ohcompressed; partition not present, except in the upper ^ 

 or \. 



Antioch (acc. to Robinson in Gray, Syn. Fl.) and Southern 

 California. 



3. T. cap pari deum Greene. Stem stoutish, erect, mostly less 

 than 1 ft. high, simple or sparingly branched; foliage as in T. 

 gracile, the upper leaves somewhat more deeply parted and with 

 longer subentire segments; pods linear-oblong, 7 to 10 lines in length. 

 2 lines wide, somewhat inflated, 1-celled, conspicuously 0-nerved. 

 tipped with a slender style; valves 4, the dehiscence beginning at the 

 apex; seeds in 4 distinct rows. 



Alkaline soil from Byron to Lathrop. Mr. C. D. Cobb sends us 

 from the Lower San Joaquin a box of 40 ripe fruits, each capsule hav- 

 ing an inner capsule containing a perfect seed. 



14. CAPSELLA Medic. 

 Slender annuals with pinnatitid leaves and small white flowers. 

 Petals small, little exceeding the calyx. Pod obcordate or elliptical, 

 strongly or scarcely at all flattened, several-seeded; valves carinate. 

 Seeds not winged; cotyledons incumbent. (Capsella, a little box, in 

 allusion to the fruit.) 



Pod obcordate, or cuneate-triangular in outline with retuse apex, strongly 



flattened 1. C. Bursa-pastoris. 



Pod elliptic-oblong, scarcely flattened, entire at theapex.2. C. procumbent. 



1. C. Bursa-pastoris Mcench. Shepherd's Pursk. Stuns 

 erect, simple or branching, 3 to 10 or 15 in. high, sparsely hispid; 

 radical leaves in a spreading rosette; lower leaves petioled. pinnatitid, 

 rarely entire, the terminal lobe largest; upper leaves merely den- 

 tate, sessile-auriculate; petals white, less than 1 to H lines long, 

 slightly exceeding the sepals; pedicels elongating in fruit, 4 lines long; 

 pods obcordate, 2\ to 3 lines broad, many-seeded, strongly flattened. 



Common in pastures, orchards and by waysides; naturalized from 

 Europe. 



