— 11 — 
glabra. Sepala 2,5—8,5 mm. lg. Petala alba, rarins 
rosea, 7—10 mm. Ig. Stylus 0,3—6,6 mm. lg. 
Syn. Sisymbrium Tilesii Ledeb. Mdm. Acad. Petersb. 
V. (1815) 548? (part.?).— Arabis petraea (3. floPibH* ma- 
joribus Ledeb. PL Eoss. I (1842)120? (part.?).— 
A. petraea iypiea lusus b: girandiflora Rgl. in Bull. 
Moscou. 34 (1861) 165- 1 
Area Geogr.. Zona arctic a a Novaja Zemlja! usque 
ad ostia LCnae fhiminis! 
OTJiHuaeTCfF ot upyrax pac Bcer^a MUoroaeTBHM 
KQpHGM, noHTH Bcerua coBepmeHBO tojiums cTefwmMH a 
KpyilHHMH UBeTaMH. 
2. A. media N. Busch hoc loco. ®, rarius 4* Cau- 
lis simplex v. plerumque a basi ramosus, glaber v. in¬ 
feme pilosus. Folia, radicalia oblongo * obovata, integer- 
rima y. sinuato - dentata, petiolis saepe ciliatis, caulina 
oblongo .* linearia, integerrima, omnia glabra v. pilosa, 
eis praecedehtis saepe angustiora. Sepala 2,5—$ mm. lg. 
Petala alba v. rosea, 5—7 mm. lg. Stylus 0,3—0,6 mm. lg. 
Syn. A. ambigua D C. Syst. II (1821) 231; Prodr. 
I (1824) 145 (part.).—Turcz. Pi. baic,-dah. I (1842) 
116 (part.).— A. umbrosa Turcz. in Ledeb. Fl. Boss. 
I (1842) 120.— A. petraea Ledeb. 1. c. (part.\ — A. 
Salieri Ledeb. Fl. Eoss. I. 121 (part.) (non L.). 
Area Geogr. Zona aretica! et subarctica! ab ostio 
Lenae! usque ad Anadyr!, montes Sajanenses orientates!, 
monies cis—et transbaicalenses! atque jacutenses! 
OTJiHuaeTca ot upyrux pac to 2-ji6thhm, to MnorojieT- 
hhm KopHeM, 6oJiee ymcHMH h MeHee HaupeaaHHMMH jihctbu- 
mh, crebjiaMH Hepemeo onymeHHUMB h uoBOUbifo mcjikhmh 
UB eTaMH, Hepemco ,po30BHMH. Hpn ycTbe JIeeti apea-iu 
A. septentrionalis h A. media - cTajiKusaioTCH Meacuy co6ok>. 
3. A. kamtschatica (Fisch.) Ledeb. ® v—au- 
les simplices v. numerbsi, glabri y. pilis simplicibus hir- 
suti. Folia radicalia lyrata, lo^o terminals plerumque 
magno, ea Barbarea# generis referentia, Caulina inferiora 
pinnatifida v. dentata, glabra v. pilis simplicibus v. 
2—3-partitis hirsuta, superiora linearia v. oblohga* inte- 
