34 CRUCIFER^E. [Dii'LOTAXis. 



Roadsides and waste places, from Roxburgh southd. ; E. Ireland ; Channel 

 Isands ; (a denizen, Wats!) ; fl. Aug.-Sept. A small herb. Leaves usually 

 long-petioled. Scapes 6-8 in., few -leaved. Flowers ^ in. diam., yellow; 

 pedicels as long as the expanded flowers, petals 2-3 times as long as the 

 sepals abruptly obovate, style not narrowed below. Pods 1-2 in., slender, 

 narrowed above and below; valves flat, almost nerveless; style stout, 

 straight, cylindric. DISTRIB. W. Europe, from Belgium southd., N. 

 Africa. 



VAR. Babinyto'niit Syme ; biennial or perennial, stem-leaves several. S. of 

 England, common ; E. of Ireland, very rare ; a denizen, Watson. 



2. D. tenuifo'lia, DO. ; stem branched leafy, leaves pinnatifid, lobes 

 long narrow, pods suberect linear on very long slender pedicels. Sisym'- 

 brium, L. ; Sina'pis, Sm. ; Bras'sica, Boiss. 



Waste places from the Cheviots southd. ; Ireland ; Channel Islands ; (a denizen, 

 Wats.) ; fl. June-Sept. Bushy, glabrous or hispid, glaucous, foetid. Root- 

 stock woody; branches 1-3 ft. Leaves 3-5 in.; lobes distant, very unequal. 

 Flowers in. diam., yellow. Pods -J in., distant, linear, narrowed at 

 both ends ; valves flat ; style stout, straight, cylindric. DISTRIB. Europe, 

 N. Africa, W. Asia. 



11. DRA'BA, L. WHITLOW-GRASS. 



Herbs, usually small, rarely annual, hoary with stellate down. Leaves 

 entire ; radical rosulate ; cauline sessile or 0. Flowers small, racemose or 

 corymbose, white or yellow. Sepals short, equal at the base. Petals 

 shortly clawed, entire. Pods oblong or linear, compressed ; valves flattish, 

 rarely ribbed ; septum membranous ; stigma simple. Seeds 2-seriate, com- 

 pressed ; funicle filiform ; radicle accumbent. DISTRIB. Temp. Arctic and 

 Alpine regions, chiefly of N. hemisphere, and Andes ; a prominent feature 

 in N. Polar regions ; species 80, all very variable. ETYM. SpajS?? , acrid, 

 in allusion to the taste. 



1. D. aizoi'des,Z. ; leaves rigid ciliate, scape leafless, petals yellow. 

 Walls and rocks, Pennard Castle, Glamorgan ; (a native ? Wats.) ; fl. March- 

 May. Perennial, densely tufted. Leaves in., rosulate, glabrous, shining, 

 keeled, margins and tip white cartilaginous ciliate. Scape 1-5 in., rigid. 

 Racemes short, slightly lengthened in fruit. Flowers J in. diam., protero- 

 gynous. Petals hardly notched. Pods oblong, acute, glabrous ; style half 

 its length ; cells 10-12-seeded. DISTRIB. Mountains of Central and S. 

 Europe, W.Asia. 



2. D. rupes'tris, Br. ; erect, small, leaves oblong-lauceolate hairy, 

 scape-leaf 1 or 0, petals white, pods small straight oblong hairy, pedicels 

 straight erecto-patent. 



Alpine rocks, alt. 3-4,000 ft., rare and local ; Ben Lawers, Cairngorm, Ben- 

 hope ; Benbulben in Ireland ; fl. July-Aug. Rootstock slender. Leaves |-J 

 in., ciliate, rarely toothed. Scapes one or more, 1-2 in., slender, flexuous ; 

 their leaf sessile, stellately pubescent. Flowers % in. diam., few, white. 

 Pods J in., oblong, obtuse ; stigma subsessile. DISTRIB. Arctic regions. 



