SENEBIERA.] CRUCIFER^. 39 



1. S. did'yma, Per soon ; lobes of fruit separating wrinkled, style minute. 

 Coro'nopus, Sm. 



Waste ground from Fife southd., and spreading ; S. and W. Ireland ; Chan- 

 nel Islands ; a colonist ; fl. July-Sept. Annual or biennial, slightly hairy, 

 diffuse, creeping, branched and leafy. Leaves finely cut, 1-2-pinnatifid ; 

 lobes small, obovate, spreading. Flowers very minute, in leaf-opposed 

 racemes, with a solitary one on the internode below, usually apetalous and 

 diandrous. Pods ^ in. broad, pedicels spreading, separating into 2 indehis- 

 cent hard lobes ; seeds reniform, punctate-striate. DISTRIB. Temp. S. 

 America ; a colonist elsewhere. 



2. S. Coro'nopus, Poiret ; lobes of fruit not separating deeply 

 wrinkled, the wrinkles forming a crest, style subulate. Coro'nopus Ruel'lii, 

 Allioni. 



Waste ground from Caithness southd. ; rare in Scotland ; local in Ireland ; 

 Channel Islands ; fl. June-Sept. Habit,Nfcc., of S. did'yma, but glabrous, less 

 branched ; foliage larger, less divided ; petals and stamens usually perfect ; 

 pods twice the size, abruptly narrowed into the subulate style, lobes connate ; 

 pedicels very short, thick, and seeds twice as large. Surface of pod variable 

 as to sculpturing. DISTRIB. Europe, N.Africa, W. Asia; introd. in the 

 U. States. 



17. LEPID'IUM, L. CRESS. 



Herbs, sometimes shrubby at the base, various in habit. Leaves entire 

 or much divided. Flowers small, white, often apetalous. Sepals short, 

 equal. Petals short or 0. Stamens 2, 4, or 6. Pods oblong ovate obovate 

 or obcordate, much laterally compressed ; valves usually keeled, winged 

 or not ; septum narrow ; stigma notched. Seeds 1 in each cell, rarely 2, 

 pendulous from the septum ; radicle incumbent, rarely accumbent. 

 DISTRIB. Temp. 'and warmer regions ; species 60-80. ETYM. \eiri8iov, from 

 the scale-like form of the pods. Stamens sometimes deformed. Cotyledons 

 3-partite in the common Cress (L. sativum, L. ) 



SECTION 1. Nasturtias'trum, Gren. and Godr. Pods much compressed, 

 entire or notched ; valves keeled, not winged ; style minute. 



1. Ii. latifo'lium, L. ; perennial, erect, radical leaves long-petioled 

 oblong serrate, pod ovoid entire. Dittander. 



Salt marshes, N.E. England, and from Wales round to Norfolk; introd. in 

 Fife and Berwick ; S. of Ireland ; Channel Islands ; fl. July-Aug. Glabrous, 

 rather glaucous. Eootstock elongate, stoloniferous. Stem 2-4 ft., much 

 branched, leafy. Radical leaves often 1 ft. ; cauline narrower, upper sessile. 

 Flowers minute, in short densely panicled bracteate corymbs. Pod T ^ in. ; 

 pedicel short ; valves not winged. DISTRIB. Mid. and S. Europe, W. Asia. 



2. L. rudera'le, L. ; annual, erect or prostrate, lower leaves 2-piuna- 

 tifid, pod orbicular-oblong notched. 



Waste places chiefly near the sea, rare and doubtfully native in Scotland ; 

 Ireland ; Channel Islands ; fl. May-June. Glabrous or slightly pubescent. 

 Radical leaves much divided, segments narrow ; upper cauline linear, entire. 



