25 CBUCIFERJE. [Barbarea. 



Lower leaves pinnate, rarely piunatifid, terminal leaflet usually largest, 

 cordate ; upper subentire or pinnatifid with amplexicaul auricled bases. 

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

 pedicels; style T^-g in. r -Distrib. Europe (Arctic), temp. Asia, Himalaya 

 to 17,0i 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. arvua'ta, 

 Reichb. ; 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.— Rare, 

 Loughgall, Armagh. 



Sub-sp. B. stric'ta, Andre.*, upper leaves entire, terminal lobe of lower 

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

 B. parvijio'ra, Fries. — Chester, York, S.E. counties. 



Sub-sp. B. intkrme'dia, Boveau-; 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 prce'cox. 



B. precox, 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. vulga'ris, of which I suspect it is a cultivated form. Seeds j 



longer than broad, twice as large and more ellipsoid than in B. vulga'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-lobe'd. Serds 1- rarely sub-2-seriate, compressed, often mar- 

 gined or winged ; radicle accumbent. — 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 subentire, petals spreading broadly clawed, pods spreading. A. 

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



Alps of Wales and Scotland, ascending above 4,000 ft. ; Glenade Mt., Leitrim ; 

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

 Leaf-segments short. Floivers 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, Buds. ; hispid, radical leaves subpetiolate small obtuse 

 sinuate-lobed, cauline few ^-amplexicaul, petals narrow cuueate subercct, 

 pods suberect. 



