23. THLASPI, Limi. 

 Pod ciniciito-oblong or obcordato, lalorally compressed, usually craarginate at this 

 apex, few-seeded ; valves acutely cariuato or winged. Seeds somewhat turgid, not 

 winged ; cotyledons accunibent. Style rather long. — Low glabrous herbs with 

 simple stems ; lower leaves rosulate, entire or toothed ; the caulinc oblong, auricle;! 

 and clasping ; flowers white or pinkish. 



About 2.') or 30 fl]ipcies, iiilmbitiiig tlio toiiipcrnto nnd coldor ropions cliinny of tlio northern 

 lioniiM[ili(Mo. Hut a single sprcioa is indigenous to Anicricn, cojninon ulao to tlio nionntnins of 

 iMiKijin nnd Asia. 



I. T. alpestre, Linn. Stems seveml from a branching perennial rootstock, 1 to 

 15 inclics hi;,'ii : radical leavo.s obovato. or elliptical, an inch long including the 

 slendcir ptitiule, entire or .sparingly toothed ; (winlino leaves ovate to oblong, entire, 

 obtuse or acutisli : flowers white, 2 or 3 lines long : ])ods (jbovate to cuneatc-oblong, 

 3 or 4 lines long, emarginate or truncate or rounded at the summit, 4 - 8-seeded, 

 tipped by a style a line long, horizontal on short pedicels. — Watson, Bot. King 

 Exp. 3L T. cochlear if or me, DC, and T. montannm, Hook. Fl. i. 58 ; Torr. & 

 Gray, Fl. i. 114. T. Fendleri, Gray, PI. Wright, ii. 14. 



Alpine in the Rocky Mountains from New Mexico to British America, in Oregon and in tlio 

 moimtains of Nevada and Arizona. Probably to be found in N. California and perhaps southward 

 in the Sierra Nevada. 



24. LEPIDIUM, Linn. PF.rrKU-GRAs.s. 

 Pod orbicular or obovato, strongly flattened laterally, omarginately 2-winged at 

 the summit; valve.s acutely (jarinato ; tho cells l-secded. Seeds not winged ; coty- 

 ledons incumbent (very rarely accumb(Mit). — Low herbs ; with pinnatifid or toothed 

 leaves, and small white (in one species yellow) flowers. The petals in many of our 

 species are often wanting, and the stamens only 2 or 4. 



A genus of nearly 100 species, of both temperate zones. Of the Ifi North American species a 

 single one is found on tho Atlantic Coast, the rest being limited chiefly to the southwest and 

 to the region west of tho Rocky Monnt.ains, and mostly low annuals of peculiar habit. 



* Loiv annuals: pedkeh fattened : petals rrinte, often vantinp : stamens 2 to A : 



st}/le none. 

 -t- Pod reticulated. 



1. L. latipes, Hook. Hispid with short spreading hairs or the leaves glabrous : 

 stems several, stout, simple, 1 to 3 inches hmg : leaves exceeding the stems, irregu- 

 larly and coarsely jiinnatilid, tho segments linear and entire or lolied : racemes short 

 and capitate, in fruit an inch long or less ; pedicels 1 or 2 lines long : sepals very 

 unequal : petals broadly spatulate, ciliate, greenish, 1 to 2 lines long, much exceed- 

 ing the sepals : pod broadly oval, 2 lines broad, sparingly pubescent, strongly reticu- 

 lated, tho broad acute wings nearly as long as the pod. — Tc. PI. t. 41 ; Torr. it 

 Gray, Fl. i. IIG. 



In snline soils near tlie coast, from Martinez to San Luis Rey. 



2. L. dictyotum, <>ray. Pubescent throughout with short spreading hairs or 

 the leav(!s glabrous : stems 1 to ."^ inches liigh, ascending, slender, branching: leaves 

 narrowly linear, 1 or 2 inches long, entire or ))innatilid with a few linear lobes : 

 petals l)ut little exceeding the sepals or wanting : stamens 4 : jmds rounded, \\ lines 

 broail, emarginntn with two short actite wings, lincly reliculnt'Ml and pubescent, ex- 

 ceeding tlio thick erect pedicels. — J'roc. Am. Ai-ad. vii. HJ'.t ; Watson, Hot. JCing 

 Exp. 30, t. 4. 



Under sage-brush in early spring at Carson City and Steamboat Springs, Nevada, Andfrson, 

 Watson, Mann. 



