MUSTARD FAMILY 79 



Eefs. — Lesquerella kingii Wats. Proc. Am. Acad. 23:251 (1888) ; Gov. Contrib. U. S. Nat. 

 Herb. 4:62 (1893) ; Gray, Syn. Fl. li:117 (1895) ; Jepson, Man. 435 (1925). Vesicaria Ungii 

 "Wats. I.e. 20:353 (1885), based on spms. from the West Humboldt Mts., Nev., Watson 82, and 

 Lassen Peak, Gal., Lemmon, B. M. Austin. L. palmeri Parish, Bot. Gaz. 65: 337 (1918) as to 

 Bear Valley plants. 



3. L. occidentalis Wats. Stems erect or ascending, 3 to 9 inches high, from 

 the crown of a stout taproot; leaves entire; blades of the basal leaves orbicular to 

 elliptic, varying to oblanceolate, % to I14 inches long, narrowed to petioles II/2 

 to 2 times as long, blades of the cauline spatulate; pods somewhat flattened, ovate, 

 acutish, 2 to 4 lines long; cells 4-ovuled. 



Easterly or northerly sides of the Sierra Nevada from Placer Co. to Siskiyou 

 Co., thence south to Lake Co., 5500 to 7500 feet : north to Oregon. Apr.-May. 



Locs. — Squaw Valley, Truckee Eiver, Sonne; Mt. Eddy, Siskiyou Co., Alexander 4- Kellogg 

 331 ; Gherry Creek, Siskiyou Co., Butler 588 ; Greenhorn Mt., Siskiyou Co., Butler 1342 ; Marble 

 Mt., Jepson 2835 ; Snow Mt., Lake Co. 



Eefs. — Lesquee-ella occidentalis Wats. Proc. Am. Aead. 23:251 (1888); Jepson, Man. 

 435 (1925). Vesicaria occidentalis Wats. I.e. 20:353 (1885), based on spms. from Yreka, Gal., 

 Greene, Multnomah Co., Ore., Howell, and White Bluffs, Columbia Eiver, Wash., T. Brandegee. 



23. DITHYRAEA Harv. 



Ours an annual herb with finely pubescent herbage. Sepals stellate-tomentose, 

 connivent above, forming a closed tube. Petals white or tinged with purple, con- 

 spicuous, broadly spatulate, with spreading limbs and slender claws. Stamens 6 ; 

 anthers linear, sagittate. Pods strongly obcompressed and didymous, that is 

 notched both above and below, the lobes suborbicular, with a distinct cord-like 

 margin. Style almost none, crowned by a large helmet-shaped stigma. — Species 3, 

 southwestern United States and Mexico. (Greek, dis, two, and thureos, shield, 

 referring to the flattened twin fruit.) 



1. D. californica Hai*v. Spectacle Pod. Stems several from the base, spread- 

 ing or ascending, 4 to 18 inches high, very brittle at the joints; leaf -blades thick- 

 ish, ovate or oblong-ovate, shallowly and somewhat sinuately few-toothed, 1 to 2 

 inches long, the basal on petioles nearly as long, the cauline nearly sessile and 

 somewhat cuneate at base; racemes very dense; flowers sweet-scented, 4 to 5 lines 

 long, on pedicels scarcely 1 line long; fruit with a tomentose-margined border, 

 3 to 4 lines broad. 



Sandy soil in the deserts, 300 to 4000 feet: Inyo Co.; Mohave and Colorado 

 deserts. South to Mexico and east to Nevada. Mar.-Apr. 



Locs. — Inyo Co.: Olancha; Keeler. Mohave Desert: Needles, Parish 9603; Goolgardie, Jep- 

 son 6633 ; Lancaster, Los Angeles Co., Davy 2277 ; Barstow, Jepson 5356 ; Stoddard Well, Jepson 

 5900. Colorado Desert: Palm Sprs., Mt. San Jacinto, Parish 4107; Borrego Spr., Jepson 8875; 

 San Felipe Narrows, C. V. Meyer 48; Blair Valley, e. San Diego Co., Jepson 8674; Vallecito, 

 Jepson 8912; Coyote Wells, Newlon 411; Indian Wells, Newlon 423; Holtville, Jepson 11,716. 



Var. maritima Dav. Leaf -blades mostly orbicular, sinuate to entire, thicker, distinctly 

 fleshy, more densely caneseent-tomentose ; racemes very dense; pods more densely pubescent. — 

 Coast sand dunes from Los Angeles Co. to San Luis Obispo Go. 



Locs. — Hermosa Beach, Los Angeles Co., Braunton 285; Playa del Eey, Braunton; Surf, 

 Santa Barbara Co.; Oso Flaco Lake, San Luis Obispo Co., W. S. Cooper 167. 



Eefs. — DiTHYRAEA CALIFORNICA Harv.; Hook. Lond. Jour. Bot. 4:77, t. 5 (1845), type from 

 Gal., Thos. Coulter 37; Jepson, Man. 436, fig. 422 (1925). Biscutella californica B. & W. Bot. 

 Gal. 1:48 (1876). Var. maritima Dav.; Eob. in Gray, Sjti. PI. r:123 (1895). Biscutella cali- 

 fornica var. maritima Dav. Erythea 2:179 (1894), type loc. Eedondo, Alice J. Merritt. D. mari- 

 tima Dav.; Dav. & Mox. Fl. S. Gal. 151 (1923). 



24. THLASPI L. 



Herbs with undivided leaves, the cauline ones auriculate-clasping. Flowers 

 in ours white. Sepals short, oval, obtuse. Petals obovate or oblanceolate. Anthers 



