70 CRUCIFEILE. (MUSTARD FAMILY.) 



on slender pedicels, linear and narrow, bringing the seeds into one row-, style 

 very short. Wet meadows, Mass, to Va. ; rare. (Nat. from Eu.) 



1. N. sinuatum, Nutt. Stems low, diffuse; leaves pinnately cleft, the 

 short lobes nearly entire, linear-oblong ; pods linear-oblong (4 - 6" long), on 

 slender pedicels; style slender. Banks of the Mississippi and westward. 

 June. 



* * Annual or biennial, rarely perennial (?), with simple fibrous roots; flowers 

 small or minute, greenish or yellowish ; leaves somewhat lyrate. 



2 "N. sessiliflorum, Nutt. Stems erect, rather simple ; leaves obtusely 

 incised or toothed, obovate or oblong ; flowers minute, nearly sessile ; pods 

 elongated-oblong (5 - 6" long), thick ; style very short. W. 111. to E. Kan., 

 Tenn., and southward. April -June. 



3. "N. obttisum, Nutt. Stems much branched, diffusely spreading; 

 leaves pinnately parted or divided, the divisions roundish and obtusely toothed 

 or repaud ; flowers minute, short-pedicelled ; pods longer than the pedicels, vary- 

 ing from linear-oblong to short-oval ; style short. With n. 1 and 2. 



4. N. pallistre, DC. (MARSH CRESS.) Stem erect; leaves pinnately 

 cleft or parted, or the upper laciniate ; the lobes oblong, cut-toothed ; pedicels 

 about as long as the small flowers and mostly longer than the oblong, ellipsoid, 

 or ovoid pods ; style short. Wet places or in shallow water ; common. 

 June -Sept. Flowers only l-l"long. Stems 1-3 high. The typical 

 form with oblong pods is rare. Short pods and hirsute stems and leaves are 

 common. Var. nfspiDUM is a form with ovoid or globular pods. (Eu.) 



3. Petals white, much longer than the calyx; pods ovoid or globular ; leaves 

 undivided, or the lower ones pmnatifid ; root perennial. 



5. N. lacustre, Gray. (LAKE CRESS.) Aquatic; immersed leaves 1-3- 

 pinnately dissected into numerous capillary divisions ; emersed leaves oblong, 

 entire, serrate, or pinnatifid ; pedicels widely spreading ; pods ovoid, l-celled, 

 a little longer than the style. Lakes and rivers, N. E. New York to N. J., 

 Minn., and southwestward. July -Aug. Near N. amphibium. 



"N. ARMORACIA, Fries. (HORSERADISH.) Root-leaves very large, oblong, 

 crenate, rarely pinnatifid, those of the stem lanceolate ; fruiting pedicels as- 

 cending ; pods globular (seldom formed) ; style very short. (Cochlearia Armo- 

 racia, L.) Roots large and long; a well-known condiment. Escaped from 

 cultivation into moist ground. (Adv. from Eu.) 



12. BAR BARE A, R. Br. WINTER CRESS. 



Pod linear, terete or somewhat 4-sided, the valves being keeled by a mid- 

 nerve. Seeds in a single row in each cell, marginless. Cotyledons accum- 

 bent. Mostly biennials, resembling Nasturtium ; flowers yellow. (Anciently 

 called the Herb of St. Barbara.) 



1. B. vulgaris, R. BR. (COMMON WINTER CRESS. YELLOW ROCKET.) 

 Smooth ; lower leaves lyrate, the terminal division round and usually large, 

 the lateral 1-4 pairs or rarely wanting ; upper leaves obovate, cut-toothed, or 

 pinnatifid at the base ; pods erect or slightly spreading ; or in var. STRICTA, 

 appressed; in var. ARC u ATA, ascending on spreading pedicels. Low grounds 

 and roadsides ; apparently introduced, but indigenous from L. Superior north- 

 ward and westward. (Eu.) 



