24 CRUCIFERJE. [BARBAREA. 



\ longer than broad, twice as large and more orbicular than in B. vulgaris. 

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



4. ARAB IS, L. ROCK-CRESS. 



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

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

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

 Pod 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 ; cotyledons accumbent. DISTRIB. N. temp, zone ; 

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

 Differs from Cardamine chiefly in the more strongly keeled non-elastic 

 pod. 



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

 cauline subentire, petals spreading broad clawed, pods spreading. A. 

 his'pida, L. ; Cardani-Hne hastula'ta, Sm. 



Alps of N. Wales, Shetland, Skye, Cairngorm Mts. and Braemar, ascend- 

 ing above 4,000ft., Glenade Mt. Leitrim ; fl. June-Aug. Glabrous or 

 hairy, perennial. Stem 8-6 in., branched below. Lenf-segments short. 

 Flowers corymbose, white or purplish. Puils 4-1 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, cauline few 4-amplexicaul, petals narrow cunuaU' 

 suberect, pods suberect. 



Rocks, Bristol and Cheddar, very rare; fl. March-May. Perennial. ,V./ 

 5-10 in., ascending or erect. Radical teares ciliate, hairs forked and 

 simple ; lobes oblong or triangular, pointing upwards. Flowers rather 

 large, cream-coloured. Pods 1 in., 3-6 times as long as their pedicels ; 

 valves 1-nerved ; style short ; seeds oblong, slightly winged above. 

 DISTRIB. Central Europe, from Spain to Hungary. Habit of .SV..< /,/>. 

 Tkalia'na. 



3. A. cilia'ta, Br. ; ciliate or hairy, stem leafy, radical leaves entire 

 <ifn-'-ssile obovate-oblong obtuse slightly toothed, cauliue sessile, petals 

 suberect white, pods erect. 



Sandy and rocky shores, Galway and S. Wales ; fl. July-Aug. Rootstock short, 

 stout, perennial, titun 4-6 in., strict, rigid, quite erect. Leaves ^-1 in., 

 cauline sessile. Flowers in. diam. Pods few, 1-1 j in., & in. broad, strict, 

 beaded ; pedicels short ; valves 1-nerved ; seeds contiguous, narrowly winged 

 all round. DISTRIB. Central Europe. Perhaps a sub-species of A. /</;.<//-/, 

 as considered by Syme. 



VAR. 1, cilia'ta proper; leaves ciliate. Seashore, Connemara, Kerry, and 

 Cork. VAR. 2, hiJpida, Syme ; leaves hispid, hairs forked. Teiiby in 

 S. Wales. 



4. A. hirsu'ta, Br. ; hispid, stem leafy, radical leaves subpetiolate 

 toothed, cauline sessile or 4-amplexicaul, petals spreading white, pods 

 many slender erect A. sagitta'ta, DC.; Turrit'is hirsu'ta, L. 



Dry places, ascending: to 2,700 ft. in Scotland, local in Ireland ; fl. June-Aug. 

 Rootitock biennial or perennial. Ktems 1-2 ft., many, slender. Leaves 1 j- 



