DIIABA.] CRUCIFER^. 35 



3. D. inca'na, L. ; erect, stellately hispid, often branched, leaves 

 oblong cauline amplexicaul, petals white, pods linear or oblong-lanceolate 

 usually twisted, pedicels erecto-patent. D. confu'sa, and D. contor'ta, 

 Ehrh. 



Alpine rocks, N. England, Wales, Scotland ; ascends above 3,000 ft. ; mountains 

 and maritime sandhills of W. Ireland; fl. June-July. Rootstock often 

 woody and long. Stem 6-14 in. Radical leaves short, -1 in., densely 

 rosulate, usually much toothed ; cauline many, suberect. Racemes much 

 elongated after flowering, many-fld. Flowers as in D. rupestris. Pods -| 

 in., variable in length breadth and twisting, glabrous or hairy, obtuse or 

 subacute ; pedicel short ; stigma subsessile ; seeds many. DISTBIB. Alpine 

 and Arctic Europe, Asia, and N. and S. America. Yery variable ; small 

 specimens with few stem-leaves resemble D. rupestris. 



4. D. mura'lis, L. ; suberect or prostrate, slender, branched, stellately 

 hispid, stem-leaves broadly ovate or cordate obtuse coarsely toothed, petals 

 minute white, pods linear-oblong horizontal, pedicels spreading. 

 Limestone rocks and walls in W. England ; from Yorks. (ascending to 1,200 ft.) 



to Somerset ; introd. in Scotland and N.W. Ireland ; fl. April-May. Root- 

 stock annual or biennial, slender. Stem 1-2 ft., flexuous. Radical leaves 

 small, f-1 in., obovate ; cauline few, distant, broader. Flowers in. diam. 

 Racemes short, fruiting long. Pods ^ in., flat, obtuse, on pedicels longer 

 than themselves; style ; seeds 10-12, minute. DISTEIB. Europe, temp. 

 Asia to the Himalaya, N. Africa. 



12. EROPH'ILA, DC. YERNAL WHITLOW-GRASS. 



Small annual or biennial herbs. Radical leaves entire, spreading. Scapes 

 slender, leafless. Flotvers few, small, white. Sepals spreading, equal at 

 the base. Petals obovate, 2-lobed or 2-partite. Pods oblong, compressed ; 

 valves 1-nerved, membranous, flat or convex ; septum membranous. Seeds 

 2-seriate, very many and minute ; funicle capillary ; radicle accumbent. 

 DISTRIB. Europe, W. Asia, and 1ST. India ; species 2-3. ETYM. cap and 

 $zAo>, from flowering in spring. 



E. vulga'ris, DC. ; leaves oblong-lanceolate toothed. Dra'ba 

 ver'na, L. 

 Abundant on walls, paths, &c., N. to Orkney ; Ireland ; Channel Islands ; fl. 



March-June. Subglabrous or delicately pubescent. Leaves f-1 in., all 



radical, rosulate. Scapes 1-16 in., flexuous. Flowers j in. diam., homo- 



gamous. Pods f J in., on spreading pedicels. DISTRIB. Europe, temp. 



Asia to the Himalaya, N. Africa ; N. America (perhaps introd.). Seventy 



forms have been cultivated by M. Jordan as specific, with more or less 



constancy. 

 E. VULGA'RIS proper ; pods compressed obovate-oblong twice or more as long 



as broad, cells 20-40-seeded. Ascends to 1,200 ft. in Yorkshire. 

 Sub-sp. E. BRACHYCAR'PA, Jord. ; pods compressed orbicular-oblong 1-1J as 



long as broad, cells 12-20-seeded. From Fife southd., scarce. 

 Sub-sp. E. INFLA'TA, Wats.} pods turgid ovoid-oblong twice as long as broad, 



cells 20-40-seeded. D. verna /3 Hook.- Alpine rocks, Ben Lawers and Glen 



Shee, alt. 2,200-3,000 ft.; fl. June-July. 



D 2 



