proxima.” Br.— What I have taken for this plant in Captain Parry’s collection, is smaller than D. alpina,
lias fewer flowers upon the scape, and much smaller and narrower petals.
6. D. micropetala ; scapis aphyllis pedicellisque pilosis, foliis lato-lanceolatis subvenosis
integerrimis pilis furcatis simplicibusque, petalis (albis) anguste-spathulatis calycem pilosi-
usculum vix superantibus, siliculis ellipticis, stigmate sessili emarginato.—Hook, in Parry’s
2d Voy. App. p. 385.
p. .minor.
H ab. Island of Igloolik. Copt. Sir JE. Parry. 0. Sea coast between the Coppermine and Mackenzie
Rivers. Dr. Richardson.—This has the habit of D. alpina, but its flowers more nearly resemble those
of D. pauciflora. They are, however, white, their petals smaller and still narrower than in the latter
species, collected into a dense corymb, or almost head of flowers, which scarcely changes its appearance even
when in fruit. Dr. Richardson gathered only two specimens of this, one in flower, which differs only from
Capt. Parry’s plant in its smaller size, and one in fruit. The sïliculoe are elliptical, purplish brown, glabrous,
veiny, crowned (as is the germen) with the sessile and deeply notched stigma.
7. D. muricella; scapo nudo velutino, foliis oblongis integris pube stellata cæsio-velu-
tinis, siliculis oblongo-lanceolatis glabris. DC.—Wahl. Lapp. p. 178. t. 11. f „2. De Cand.
Prodr. v. 1. p. 168. Brown in Boss’s Voy. App. p. 193. Rich, in Frankl. 1st Jowrn. ed. 2.
App. p. 27. Hook, in Parry’s 2d Voy. App. p. 387.—D. nivalis. Liljab. (not Willd.)—
Pursh, FI. Am. v. 2. p. 433?
H ab. Labrador. Colmaster, (in Pursh.) Arctic shores of America. Ross. Parry. Woody country
between lat. 54° and 64°. Dr. Richardson.—I scarcely see how this may be discriminated from D. nivalis and
hirta. De Candolle has placed it among the Chrysodraboe, or those species which have yellow flowers ; but
he expressly says the blossoms are white, though his var. 0. cæsia has yellow ones.
8. D. oblongata ; scapis nudis, pube floccosa subhirsutis, foliis cæspitosis oblongo-line-
aribus integris ciliatis velutinisque, siliculis elliptico-oblongis velutinis. DC.—Brown in
Boss’s Voy. App. (without descr.) De Cand. Prodr. v. 1. p. 169.—D. hirta, var. 2. Hook,
in Parry’s 2d Voy. App. p . 386.
Hab. Shores of Arctic America. Ross. Igloolik and Barrow River. Parry. I have not seen this
species, nor is it known to Botanists except by De Candolle’s description. It seems very closely allied
to D- hirta.
9. D. corymbosa ; scapis nudis hispidulis, foliis dense cæspitosis oblongis basi attenuatis
ciliatis subhispidisque, siliculis ellipticis corymbosis hispidulis. DC.—Brown in Boss’s
Voy. App. — De Cand. Prodr. v. 1. p. 169.
H ab. Shores of Arctio America. Capt. Boss.—This is mentioned by Mr. Brown as being extremely
similar to JO. oblongata and rupestris ; and De Candolle says of it, “ JO. oblongata et hirta affims.
10. D. hirta; scapis puberulis, folia pauca plerumque dentata gerentibus, foliis radi-
calibus oblongis subintegris puberulis, siliculis oblongis pedicellisque glaberrimis, stylo
subnullo.— Linn. Sp. PI. p. 89T. Wahl. Lapp. p. ITS. t. 11. f . 3. Hook, in Parry's 2d
Voy. App. p. 385. (var. 1.) Bich. in Frankl. lsf. Joum. ed. 2. p. 21.
S. siliquosa, siliculis 9 lineas longis. Cham, et Schlecht. in Dimum, v. 1. p. 23.
I. foliis glabriusculis, scapo omnino glabro.
H ab. Arctic and subarctic America, as well as upon the Rocky Mountains; frequent. S. Unalaschka.
Chamisso. i. Sea shores between the Coppermine and Mackenzie Rivers. Dr. Richardson.—A most
variable plant, differing, as do the rest of the genus, in the length and breadth of the foliage, in the degree of
pubescence, in the form of the silicuke, and in the absence or presence of leaves upon its stem; so that to me
it appears, on the one hand, readily to pass into D. rupestris of Mr. Brown, which here (out of respect to
such high authority,) I have ventured to keep distinct; while, on the other, it is difficult to distinguish it from
some of the slender states of D. incana.
11. D. rupestris; scapo nudo vel unifoliato pubescente, foliis oblongo-spathulatis subhirsutis
ciliatisque, siliculis oblongis pubescentibus vel glabris, stylo perbrevi, stigmate
emarginato.
u.. siliculis pubescentibus. Br. in Hort. Kew. ed. 2. v. 3. p . 91. Hook. FI. Scot. 1.
p. 197. Cham, et Schlecht. in Linncea, v. 1. p. 23. De Cand. Prodr. v. 1. p. 169.—D. hirta.
Sm. in Engl. Bot. t. 1338. (not of Linn, nor of FI. Dan.—Br.) Sm. in Engl. FI. v. 3. p. 159.
H -D . hirta, /3. alpicola. Wahl. Lapp. p . 175. t. 11. f . 1. Hook. FI. Scot. 1. p. 197.—D.
hirta, var. 4. Hook, in Parry’s 2d. Voy. App. p . 386.
fi. siliculis glabris.
H ab. 0. Rocky Mountains, in stony places, between lat. 52° and 57°. Drummond.—This species was
founded by Mr. Brown, on specimens, I believe, from Ben Lawers, in Scotland; where I have gathered
for many successive years in great abundance, and it assuredly varies in the pubescence being more or less
dense, and more or less branched and stellated. The siliculse are generally pubescent; but sometimes, as is
the pedicel, quite glabrous. The latter is the state of the Rocky Mountain plant, and it is probably identical
with A. nivalis of Willdenow.
12. D. lapponica; scapis nudis glaberrimis, foliis lanceolatis integerrimis pilosiusculis,
siliculis ovato-lanceolatis pedicellisque glaberrimis. DC.—Willd. — De Cand. Prodr. v. 1.
p. 169. Br. in Parry’s ls£ Voy. App. p. 266. Cham, et Schlecht. in Linncea, v. 1. p. 22.—D.
hirta, var. 3. Hook, in Parry’s 2d Voy. App. p . 386.—D. androsacea. Wahl. Lapp. p.
174. t. 11. f . 5.
Hab. Shores and islands of Arctic America. Ross. Parry.
13. D. stellata; scapis 1-phyllis pubescentibus, foliis ovali-oblongis pube stellata brevi
tomentosis, pedicellis puberulis, siliquis oblongis. DC.—Jacq.,Hort. Vindob. p. 113. Obs.
n. 54. t. 4. f . 3. De Cand. Prodr. v. 1. p. 169. Cham, et Schlecht. in Linncea, v. 1. p . 22.—
D. hirta. Jacq. Austr. t. 432.
0. hebecarpa; siliculis undique velutino-pubescentibus. DC.
Hab. Unalaschka. Chamisso. 0. Arctic America. Dr. Richardson.—The figure referred to in Jacquin’s
Flora Austriaca, I have always conceived to be admirably characteristic of our Scottish D. rupestris, especially
the upper figure. The var. 0. is very hairy, and more disposed to be leafy on the stem than the
D. rupestris of this country.
14. D. Icevipes; scapis nudis monophyllisve pubescentibus, foliis ovatis pube stellata
brevi tomentosis, siliculis elongato-linearibus pedicellisque glaberrimis. De Cand. Syst.
Nat. v. 2. p. 346. De Less. Ic. Sel. v. 2. t. 46. f . a. De Cand. Prodr. v. 1. p. 169.
Hab. Rocky Mountains, between lat. 52° and 57°. Drummond.—A few specimens, well according with
De Candolle’s description and De Lessert’s figure, are in Mr. Drummond’s collection.