Melville Island ! Shore of the Arctic S e a ! Kotzebue’s Sound.—Flowers
large, fine yellow, rarely white. Our specimens from Melville Island have
the scape and sepals nearly glabrous, and the leaves very sparingly hirsute.
3. D. glacialis (Adams): scape naked, stellately pubescent or glabrous;
leaves linear-lanceolate, entire, rigid, stellately pubescent; petals (yellow)
twice the length of the calyx; silicles racemose, oblong-ovate, the cells 5-6-
seeded; style short.—“Adams, in mem. soc. nat. Mdse, ex DC. prodr. 1. p.
167; Hook.! fl. Bor.-Am. 1. p. 51.
a. scapes, pedicles, and silicles [nearly] glabrous; flowers pale yellow.
Hook.! 1. c.
0. scapes and pedicels pubescent; silicles glabrous. Hook.! 1. c.
y. scapes, pedicels, and silicles strongly hirsute-pubescent. Hook.! 1. c.
S. smaller; scapes numerous and, with the pedicels, glabrous; flowers very
pale yellow. Hook.! 1. c.
c. smaller; scapes and pedicels glabrous; flowers deep yellow. Hook. 1. c.
Rocks on the loftiest of the Rocky Mountains, lat. 52°-57°, and on the
shores of the Arctic Sea.—Leaves narrow and more rigid than in the preceding
species, furnished with a strong midrib. Style short, but distinct.
4. D. oligosperma (Hook.): scape naked, slightly pubescent; leaves
erect, linear, rigid, ciliate, stellately pubescent on both sides, especially
towards the apex; petals (white) twice as long as the slightly hairy calyx;
silicles pubescent, racemose, elliptical, rather acute at each end, 4-8-seeded,
four times the length of the style. Hook.! jl. Bor.-Am. 1. p. 51.
__0.7 Andina (Nutt.! mss.) : “ densely csespitose; leaves imbricated, linearoblong
; silicle ovate, rather obtuse at the base ; cells about 2-seeded.”
Mackenzie’s River, lat. 68°. 0. Summits of lofty hills towards the sources
of the Platte, within the Rocky Mountain range. Nuttall!—Stems or scapes
in a. 3 inches ; in 0. 2 inches high. Leaves about 3 lines long. Pedicels a
little longer than the fruit.—The var. 0. differs in its more densely imbricated
leaves, as well as in the shorter and fewer-seeded silicles. The flowers have
not been seen. It will perhaps prove to be a distinct species.
5. D. densifolia (Nutt.! mss.): “ densely csespitose in somewhat globose
tufts; leaves closely imbricated, oblong-linear, strongly ciliate, and hirsute
with nearly simple hairs; scapes naked, hirsute; silicle ovate, pubescent,
with a style about one-third its length; cells mostly 2-seeded.
“ On the central chain of the Rocky Mountains towards Lewis’s River.—
Resembles the preceding, but differs in the pubescence being nearly simple,
and in the remarkable density of the foliage.” Nutt.
6. D. pauciflora (R. Brown) : scapes and pedicels hairy ; leaves lanceolate,
entire, hairy (the hairs simple or branched); petals (yellow) spatulate,
scarcely exceeding the hirsute calyx. R . Br. in Parry's 1st voy. app. p.
266; Hook. fl. Bor.-Am. L p. 51.
Melville Island.—A doubtful species : near D. alpina. R. Brown.
7. D. micropetala (Hook.) : scapes and pedicels hairy ; leaves broadly
lanceolate, veiny, entire, covered with a simple or branched pubescence; petals
(white) linear-spatulate, scarcely exceeding the slightly hairy calyx; silicles
elliptical, glabrous; stigma sessile, emarginate. Hook.! in Parry's 2d
voy. app. p. 385, f fl. Bor.-Am. 1. p. 52.
Island of Igloohk, and (0. minor) sea coast of Arctic America.—Habit of
D. alpina. The flowers resemble those of D. pauciflora, but are white.
8. D. muricella (Wahl.): scape naked, velvety; leaves oblong, entire,
canescent with a soft stellate pubescence; silicles oblong-lanceolate, glabrous
(flowers white.) DC.— Wahl. fl. Lapp. p. 178. t. 11. f . 2; DC.
prodr. 1. p. 168; Hook.fl. Bor.-Am. 1. p. 52. D. nivalis, Liljeblab.P ursh,
fl. 2. p. 4337
Labrador and Arctic America.—Not well distinguished from D. nivalis
and D. hirta. Hook.
9. D. oblongata (R. Brown) Escapes -naked, somewhat floccosely hirsute;
leaves csespitose, oblong-linear, entire, ciliate and velvety-; silicles oblong-
elliptical,-velvety. DC.—R. Br. in Ross's voy. app. (without descr.); DC.
prodr. 1. p. 168; Hook.fl. Bor.-Am. 1. p. 52. D. hirta, var. 2. Hook,in
Parry's voy.
Shores of Arctic America.—Flowers unknown : style very short.
10. D. corymbosa (R. Brown): scape naked, minutely'hispid; leayes
densely csespitose, oblong, attenuate at the base, ciliate and somewhat hispid;
silicles elliptical, corymbose, minutely hispid. DC.—R. Br. 1. c .; DC.
prodr. l.p . 169; Hook.fl. Bor.-Am. l.p .5 2 .
Shores of Arctic America.—Very near D. oblongata and D. rupestns.
R. Brown.
11. D. hirta (Linn.): scape puberulent, often bearing one or two toothed
leaves; radical leaves oblong, mostly entire, minutely pubescent; silicles ob-
long, and, with the pedicels, glabrous; style almost „ S’ none (flowers white). „1 . . n . T \ n __1 m 1 RQ . TTr.nl. a
Bor.-Am. 1. p. 52.
S. siliquosa: silicles 9 lines long. Hook. 1. c.
c. leaves almost,glabrous; scape entirely glabrous. Hook.! 1. c.
Arctic and Subarctic America! Rocky Mountains; .Kotzebue’s Sound.
A variable plant, appearing to pass into D. rupestris on the one hand, and
into D. incana on the other. Hook.
12. D. rupestris (R. Brown): scape naked, or with a single leaf, pubescent
; leaves oblong-spatulate, ciliate and somewhat hirsute; silicles oblong,
pubescent or glabrous ; style very short; stigma emarginate (flowers white).
Hook.! fl. Bor.-Am. l.p . 53. , .
o. silicles pubescent. Hook.! 1. c.—D. rupestris, R. B r .m h o r t. Kew.3.
p. 91; DC. prodr. l.p . 169. D. hirta, Eng. bot. t. 1338. D.hirta, var. 4.
Hook, in Parry's 2nd voy. app.p. 386.
0. silicles glabrous. Hook..' l.c.
Rocky Mountains, lat. 52°-57°—Not well distinguished from D. hirta.
The var. 0. Hooker supposes to be identical with D. nivalis, Willd. -If so,
as is not improbable, that name being the older by several years, must be
adopted instead of the one here employed.'
13. D. Lapponica (Willd.): scapes naked,'glabrous; leaves lanceolate,
entire, slightly hairy; silicles ovate-lanceolate, and (with the pedicels) glabrous.
DC. prodr. 1. p. 169; R. B r .! in Parry's 1st voy. app. p. 266;
Hook. ft. Bor,-Am. 1. p. 53. D. hirta, var. 3. Hook, in Parry's voy. 1. c. D.
androsacea, Wahl. fl. Lapp. p. 174. t. 11. f 5.
Melville Island !—Flowers white. ‘
14. D. stellata (Jacq.): scape with a singleleaf, pubescent; leaves oblong-
oval, tomentose with a short stellate pubescence ; pedicels puberulent; si-
liques oblong. DC.—“ Jacq. hort. Vindob. p. 113,. 06s. n. 54. t. 4 ./. 3.” ;
DC. prodr. l . p . 169; Deless.ic. 2. t.A&.f. B ; Hook.fl. Bor.-Am. l.p . 53.
D. hirta, Jacq.
0. hebecarpa: silicles entirely clothed with a velvety pubescence. DC.
1. c .; Hook, l.c.' . . ' . •_
Unalaschka and Kotzebue’s Sound. /?. Arctic America!—Lower.leaves
lanceolate-obovate, ciliate.. Flowers white.
15. D. Icevipes (DC.): scapes naked or with a single leaf, pubescent;
leaves ovate, tomentose with a short woolly pubescence; silicles long and