206 THE JOURNAL OF BOTANY 



The plant published as B. taurica (D. C. Syst, ii, 257) from 

 the description seems undoubtedly B. arcuata Reichb. De Candolle 

 cites as a synonym " Erysivmm Barbarca M. Bieb. 11. taur. 2, 

 p. 116, ex Stev." I have been unable to find any mention by 

 Steven of this plant, but the South Russian specimens which I 

 have seen are all arcuata, and the reference is therefore probably 

 correct although there is nothing in Bieberstein's description to 

 distinguish his plant from E. Barbarea L. It is referred to var. 

 arcuata by Fries, and the identity does not seem to have been 

 disputed. The name taurica is, however, itself antedated by 

 Erysimum arcuatum Presl. (Fl. Cech., 138, 1819). 



The following arrangement of the British forms appears to be 

 the most natural and satisfactory which can be adopted : it follows 

 that of Fries in the work already cited, and that which will be 

 adopted in The Cambridge British Flora. The localities cited are 

 in every case those from which I have seen specimens. 



Barbarea vulgaris [R. Br. in] Alton Hort. Kew. ed. 2, iv, 

 109 (1812). 



Erysiynum Barbarea L. Sp. PI. 660 (1753) excl. vars. 



E. lyratum Gilib, Fl. Lituan. ii, 59 (1782) (nomen abortivum). 



B. lyrata Aschers. Fl. Brandenb. i, 35 (1864). 



Biennial or perennial, dark shining green. Stem erect, angular, 

 branching above, sometimes purplish at the base, glabrous or 

 slightly hairy "^ up to about 8 dm. high. Radical and lov/er leaves 

 pinnately cut, terminal lobe much the largest, elliptic-oblong or 

 suborbicular, entire or undulate in margin, occasionally subcordate 

 at the base ; lateral lobes in 2-4 pairs, oblong-elliptic or linear, 

 upper pair together equalling or exceeding the terminal lobe in 

 width, or occasionally all the lateral lobes small or absent. Lower 

 stem -leaves auriculate, upper ones obovate or elliptic, irregularly 

 toothed or lobulate, or almost entire. Flower-buds glabrous. 

 Flowers variable in size. Petals bright yellow, 4-8 mm. long. 

 Pods variable in direction, erect or more or less spreading, 

 1-2-2-5 cm. long, on pedicels 3-4 mm. long, tapering to a slender 

 style 1-5-3 mm. long. Seeds ovoid to oblong, 1-1|^ mm. in greater 

 diameter. 



VAR siLVESTRis Fries, Nov. Fl. Suec. 205 (1828) ; B. stricta 

 Boreau, Fl. Centre ed. 3, ii. 39 (1857), non Fr. excl. syn. ; B. 

 rivularis Martr.-Don. Fl. Tarn. 44 (1864) ; B. vulgaris sub-sp. 

 eu-vulgaris Syme, Eng. Bot. ed. 3, i, 171 (1863) (partim) ; B. vul- 

 garis race rivularis Rouy & Fouc. Fl. Fr. i, 198 (1893). 



Exsiccata. Billot, 3011 (as B. stricta). 



Plant usually small, with solitary stems. Lateral lobes of 

 lower leaves, very small or wanting. Pods short, about 12 mm. 

 long, appressed. 



Dry roadsides, field borders. Not often recorded though pos- 

 sibly not uncommon. 



* Plants with slightly hairy foliage have been named B. hirsuta (Weihe, 

 apud Reichb. Fl. Germ. 682 (1832)), but some of the specimens issued as this 

 in Reichenbach's exsiccata (no. 679) have glabrous or glabiescent foliage. 



