2-3 GRUCIFERM. [BARBAREA. 



Lower leave? pinnate, rarely piunat'fid, terminal leaflet usually largest, 

 cordate ; upper subentire or pinnatifid with amplexicaul auricled bases. 

 Flowers small, bright yellow. Pod* f-1 in., broader than their slender 

 pedicels; style ^j-J iu.--DiSTRiB. Europe (Arctic), temp. Asia, Himalaya 

 to 17,0 10 ft., S. Africa, Australia, and N. America. 



B. VULGA'RIS proper ; raceme about as long as broad, petals twice as long as' the 

 sepals, pods in a dense raceme 3-6 times as long as their pedicels, erect 

 rarely spreading, seeds 1| times as long as broad. Common. VAR. arcua'ta, 

 Beichb. ; raceme elongate, petals rather more than twice the length of the 

 sepals, pods in a lax raceme arched and spreading when young 5-8 times as 

 long as their pedicels, seeds more than twice as long as broad. Bare, 

 Loughgall, Armagh. 



Sub-sp. B. STRIC'TA, Andrz. ; upper leaves entire, terminal lobe of lower 

 oblong, flowers smaller, pods in a dense narrow raceme with erect pedicels. 

 B.parmJU/ra, Friss. Chester, York, S.E. counties. 



S'ib-sp. B. INTEBME'DIA, Boreau ; leaf-segments many, petals twice as long as 

 the sepals, pods in a dense raceme erect 4-6 times as long as their pedicels, 

 seeds nearly as long as broad. Cultivated fields, rare. Intermediate 

 between B. stric'ta and pr a' cox. 



B. PR^'COX, Br. ; leaves pinnatifid, segments narrow, petals 3 times as 

 long as the sepals, pods long and distant scarcely thicker than their very 

 stout short pedicels, style very short. American Cress. 

 Roadsides, &c., a garden escape; (an alien, Wats^)\ fl. April-Oct. Very 

 similar to B. vulya'ris, of which I suspect it is a cultivated form. Seeds J 

 longer than broad, twice as large and more ellipsoid than in B. vulya'ris. 

 DISTRIB. All Europe ; introd. in U. States. An excellent salad. 



4, AR'ABIS, L. ROCK-CRESS. 



Annual or perennial herbs, glabrous or with forked or stellate hairs. 

 Radical leaves spathulate ; cauline sessile. Flowers usually white. Sepals 

 short, equal, or the lateral saccate at base. Petals entire, usually clawed. 

 Pods linear, compressed ; valves flat, keeled, veined or ribbed ; stigma 

 simple or 2-lobed. Seeds 1- rarely sub-2-seriate, compressed, often mar- 

 gined or winged ; radicle acciimbent. DISTRIB. N. temp, zone ; species 

 60. ETYM. From Arabia, -the native country of various species. Differs 

 from Cardami'ne in the more keeled less elastic pod-valves. 



1. A. petrse'a, Lamk. ; leaves petioled radical lyrate-pinnatifid, 

 cauline subsntire, petals spreading broadly clawed, pods spreading. A. 

 his'pida, L. fil ; Cardami'ne has tula' ta, Sm. 



Alps of Wales and S3otland, ascending above 4,000 ft. ; Grlenade Mt., Leitrim ; 

 fl. June- Aug. Glabrous or hairy, perennial. Stem 3-6 in., branched below. 

 Leaf-segments short. Flowers corymbose, white or purplish. Pods -1 in. ; 

 valves 3-nerved ; seeds hardly winged. DISTRIB. Alpine and Arctic 

 Europe, N. Asia and N. America. 



2. A. stric'ta, Huds. ; hispid, radical leaves subpetiolate small obtuse 

 sinuate-lobed'vcauline few ^-amplexicaul, petals narrow cuneate suberect, 

 pods suberect. 



