138 | Rhodora [Још 
which subtend the flowers, is confined to the southern Alaskan and 
Aleutian region, extending by way of the Aleutian Islands to the coast 
and islands of Kamchatka and Amur. ‘This distinct plant, which, 
in the presence of well developed floral bracts suggests the local 
Barbarea bracteosa Guss. of Sicily and the Neopolitan district, differs 
from that southern plant in many details. It seems, with little question, 
to be C. A. Meyer's B. planisiliqua, originally described from the 
region of the Ochotsk Sea but stated by Tiling in his more detailed 
account of the plant to occur also on Unalaska.! The citation of B. 
planisiliqua from Unalaska is significant since, of the numerous 
specimens of Barbarea examined from Alaska, only one species — the 
plant under discussion — has been found from Unalaska. During the 
Jaggar Expedition to the Aleutian Islands in 1907 Dr. Edwin C. 
Van Dyke collected both B. orthoceras and the plant with leafy-bracted 
inflorescence; and it is notable that he, like earlier collectors, found on 
Unalaska only the latter species. 
The conclusions reached in this study of Barbarea in North America 
may be summarized as follows, 
* Beak of the silique slender, 2-3 mm. long: uppermost leaves incised, 
coarsely dentate, angulate, or lobed, but rarely pinnatifid. 
BarBAREA VULGARIS R. Br. Glabrous throughout: radical and 
lower cauline leaves green, rarely purple-tinged, usually pinnatifid; 
the terminal lobe large, suborbicular to elliptic-oblong; lateral lobes 
2-4 pairs (rarely none), the upper pair larger than the lower: middle 
leaves lyrate-pinnatifid: uppermost leaves obovate or oblong, coarsely 
dentate or angulate above the middle, often incised but scarcely pinnati- 
fid below: flowers orange-yellow, showy: siliques 2-3(-4) cm. long, 
subterete to quadrangular, on more or less divergent or spreading- 
"ascending slender pedicels.— R. Br. in Ait. Hort. Kew. ed. 2, iv. 109 
(1812); Am. auth., as to the introduced plant of the East. Eyrsimum 
Barbarea L. Sp. Pl. ii. 660 (1753). Sisymbrium Barbarea Crantz, 
Stirp. Austr. fasc. i. 54 (1769). Erysimum lyratum Gilib. Fl. Lith. 
li. 59 (1782). В. taurica DC. Syst. її. 207 (1821)! B. arcuata 
Reichenb. Flora, v. 296 (1822).! В. vulgaris, y. arcuata Fries, Novit. 
Fl. Suec. 205 (1828); Gray, Man. ed. 2, 35 (1856) in part. B. lyrata 
1 “Ich sah Pflanzen aus verschiedenen Gegenden Ost-Sibiriens, aus Kamtschatka, von 
den Kurilen und aus Unalaschka” — Regel & Tiling, Fl. Ajan. 46 (1858). 
? Barbarea taurica and В. arcuata are treated by Old World students of the genus as 
identical, and by many the plant (under the name B. arcuata) is kept separate from B. 
vulgaris. If such separation is maintained the name B. taurica, it should be noted, will 
have to be used instead of B, arcuata, which was published in the succeeding year, 
