62 



CRUCIFER^. [Sisi^ihrium, 



medio uninerviEe. Semina miiserialia, ferrugiuea, oblonga, ad apicem attcnuata. Cotyledones graciles, in- 

 cumbentes. 



Hab. York Factory in Hudson's Bay, to the shores of the Arctic sea, westward of the Mackenzie River. 

 Br. Kichardson; Dmmmcnd; Capt Sir John Franklin; and Capt Back. Kotzebue's Sound and Bay of 

 Eschschoitz in Behriag's Straits. Chamisso; Lay and Collie in Capt, Beechetfs Collection. ^'Sumoroxis 

 specimens from very diiferent parts of the interior and extreme north and north-west coast of America, all 

 agreeing in the same characters, have induced me to coincide with my friends Dr. Fischer and Dr. Richard- 

 son in considering this species distinct from our European S. SophiOy which has generally more divided 

 leaves, more elongated corymbs or racemes, and shorter pods. I have not seen the true S. Sophia from any 

 part of North America. The species so called by Pursh, Nuttall considers to be a new plant, alUed to S, 

 album of Siberia; while Elliott refers it to S. canescens. Our plant has much longer pods than any of the 

 present division with hipinnatifid leaves, except S.persicum. Dr. Fischer*s specimens of S. sopMoides from 

 Kotzebue's Sound, are precisely the same as ours. 



Tab. XX. Vlant i~7iatural size. Fig, 1, Flower; ^g. 2, Stamen; ^^7. 3, Petal; /^. 4, Pod; Jig. 5, Seed; 

 ^g. 6, Embryo ; ^g, 1, Section of do. : — magnified, 



5, S, canescens ; cano-pubescens, foliis bipinnatifidis, lobis ovatis lanceolatisve obtusis 

 dentatis, petalis calycem aequantibus, siliquis linearibus (brevibus) longe racemosis. 



«. major; foliorum lobis angustioribus. — S. canescens. Nntt, Gen, Am. v, 2, p, 68.? 



Hich, in Frankl. \st Journ, ed, 2, App, p, 27. Elliott^ Carol, v, 2. p, 147. Torrey in PL 



of R, M, in Ami, of Lye. N, Y. p, 166. — Cardamine? Menziesli. De Cand, Prodr, v. 1. 

 p. 153? 



fi. minor ; foliorum lobis latioribus. 



■ 



Hab. a. In the low grounds, from lat. 30° to 60°. Dr. Richardson, Plentiful about the Saskatchawan 

 and Red Rivers. Douglas. — /3. In the Rocky Mountains and about Fort Franklin, lat. 66°. Drummond; Dr, 

 Richardson, California. Mr. Menzies, — I have refeiTed to Nuttall, the original authority, indeed, for this 

 species, with a mark of doubt; because on looking over Dr. Richardson's specimens, he Avas of opinion that 

 they were distinct from his canescens. Nevertheless, his short character sufficiently accords with our plant, 

 save that he describes the pods as clavate, which ours are, only in a slight degree, when the lower seeds in 

 the cells are abortive, occasioning a corresponding contraction in that part of the seed-vessel. I am disposed 

 to think the species has a very extensive range. If Nuttall's and Elliott's plants be the same, it is very com- 

 mon in Carolina and Georgia ; and I possess specimens, which I can by no means distinguish from it, gathered 

 near Rio Quinto, in the province of St. Louis, S. America, by Dr. Gillies. 



6. S. brachycarpum ; subglabrum, foliis bipinnatifidis, lobis lanceolatis obtusis integris 

 vel parclter dentatis, petalis calyce majoribus, siliquis linearibus (brevibus). — Rich, in 

 Frankl. \st Journ, ed, 2. App. p. 27. 



Hab. From Canada to the Arctic Sea, and across the whole width of the Continent. Dr, Richardson, 

 Drummond. Great Falls of the Columbia, in low moist soils. Douglas. — Habit of S. Sophia, but, as Dr. 

 Richardson well observes, easily distinguished by its pods being twice as short, scarcely different from the 

 preceding in that respect, from which again it is separated by its almost glabrous stems and leaves, and in 

 having the petals, in general, but, I think, not always, longer than the calyx. I possess some specimens 

 that I can with difl&culty say to which they should be referred. 



* * # # 



Arabidopsis. SdiqucB Uneares, compressce, stigmate sessili truncato. Flores alhi {vel 



suhrosei) hrevissime pedicellati. Pedicelli ehracteati. DC, 



7. S.humile; incano-pubescens, perenne, caulibus difFusis, foliis integris vel sinuato- 

 dentatis radicalibus spathulatis, caulinis lanceolatis basi attenuatis, siliquis linearibus 



