62 CRUCIFER^:. cobonopus. 



LEPIDIUM. 



or only 4 or 2. Anthers short, somewhat didymous. Stigma 

 sessile, nearly or quite simple. Pods more or less distinctly did- 

 ymous, the valves thickish, often sculptured or tuberculate fall- 

 ing off as 1-seeded closed or nearly closed nutlets. Embryo fold- 

 ed above the base of the incumbent cotyledons. 



0. diyymus Smith Fl. Britt. ii, 691. Annual or biennial : stems num- 

 erous and slender : leaves short an inch or less long pinnately parted with 

 7-9 lanceolate entire or sparingly toothed segments: flowers very small, 

 greenish white : petals minute or none : pods small, 1-1 K lines broad 

 notched at both ends, thus appearing transversely 2-lobed; valves turgid 

 and finely wrinkled. In moist soil and ditches, California to Vancouver Is- 

 land near the coast, and along the Atlantic seaboard. Introduced from 

 Europe. 



C. Ruellii All. Ped. n. 634. Annual or biennial : stems rather stout : 

 leaves an inch or more long pinnatifid with narrow lanceolate entire or 

 sparingly toothed segments : pods flattened 1)^-2 lines broad, not notched 

 above nor divided into 2 lobes, strongly roughened and somewhat crested 

 by radiating prominences. Roadsides and rubbish heaps, Poriland Ore- 

 gon, and the Atlantic States. Introduced from Europe. 



31 LEPIDIUM Tourn. Inst. 215, t. 109. L. Gen. n. 801. 



Low herbs with small pinnatifid leaves and small white or yel- 

 low flowers in terminal racemes. Sepals short, ovate or elliptic- 

 oblong, obtuse, equal at base, more or less spreading. Petals en- 

 tire, rounded at the apex : sometimes abortive or none. Stamens 

 free, unappendaged, all 6 present or by abortion only 4 or 2 pre- 

 sent, these representing the two larger pair. Style slender and 

 more or less elongated, or none. Pods orbicular or ovate, emargin- 

 ate or deeply notched at the apex, strongly compressed contrary 

 to the narrow partition. Valves acutely carinate ; the cells 

 1-seeded. Seeds not winged. Cotyledons incumbent or rarely 

 accumbent. 



§ 1 Style slender, sometimes rather short but distinctly de- 

 veloped and persistent. Cotyledons incumbent. 



L. moiitanum Nutt. T. & G. PI. i, 116. Puberulent or nearly gal- 

 brous : stems several from a perennial, somewhat ligneous root, 8-15 inches 

 long, decumbent and spreading in a somewhat circular manner : radical 

 leaves more or less bipinnatifid with short-oblong acute segments ; upper- 

 most leaves trifid or linear and entire : petals nearly twice as long as the 

 oval oblong sepals : style conspicuous : pods a line broad elliptical, slightly 

 emarginate, wingless or obscurely winged above, with short acutish teeth. 

 Plains and mountain valleys, Washington to California and the Rocky 

 Mountains. 



L. integrifolia Nutt. 1. c. Glabrous or puberulent: stems several 

 from a single stout root, branching from the base: leaves oblong, oblan- 

 ceolate or spatulate, acute or apiculate, thickish, 1-2 inches long, 2*4-3% 

 lines broad, entire: racemes single and terminal, or more commonly sev- 

 eral, 1-2 inches long : pedicels spreading, 3-4 lines long: petals obovate, 

 white, about twice the length ot the broad membranaceous sepals, indis- 

 tinctly and broadly clawed, deciduous with the sepals: stamens 2: capsule 

 ovate-oblong l)o-2 lines long, barely retuse inconspicuously reticulated 

 when quite ripe. Southeastern Washington to the Rocky Mountains. 



L. campestrb R. Br. in Ait. I. Kew ed. 2, iv, 88. Pubescent : stems 

 erect, simple and very leafy up to the inflorescence, a foot or more high: 



