15. D. crassifolia; scapo nudo vel unifoliato, pedicellis ealyceque glaberrimis, foliis
lineari-spathulatis suibcarnosis, pilis simplicibus ciliatis, petalis apice retusis calycem paulo
superantibus.^—Graham in Edin. Phil. Joum. 1829. p . 182.
cc. petalis,albis.
/S. petalis pallide flavis.
Radix parva, gracilis, descendens, fibrosa, superne multiceps. Folia rosulata, fere omnino radicalia, vix
unciam longa, lineari-spathulata, subcarnosa, pallide viridia, integerriraa vel paucideutata, glabra, margine
pilis simplicibus albis ciliata, basi non raro iu petiolum longiusculum attcnuata. Scapi 2, 3, nonnunquam
4 uncias longi, flexuosi vel curvafi, aphylli, vel folium unicum liueare basin versus gerentes, glaberrimi.
Flores laxe corymbosi, pauciflori. Pedicelli subcurvati vel flexuosi, demum patentissimi. Calycis sepala
ovato-rotundata, glaberrima,. viridia ad marginem pallidiora. Petala alba, in /3. pallide flava, obovata, basi
attenuata, apice retusa vel obtusissime emarginata. Siliculce glaberrima*, clliptico-ovata. Stigma sessile,
parvum.
Hab. Summits of the Rocky Mountains, between lat. 52° and 57?.—The small size of the whole
plant, frequently not rising more than 2 inches above the surface of the soil, the absence of pubescence, its
waving scapes and pedicels, and small flowers, would seem to constitute a distinct character: yet the larger
specimens offer many points in common with the D. glabella. Ph. The general habit is that of Erophila
vulgaris, but its petals are by no means bipartite, but simply notched.
* * Caidis foliosus. Annua vel Biennes.
16. D. ? laevigata; caulibus foliosis simplicibus glabris strictis, foliis radicalibus et
caulinis inferioribus peliolatis ovatis basi attenuatis carnosiusculis margine obsolete ciliatis,
siliculis oblongo-lanceolatis, pedicellis brevibus quadruplo sextuplo longioribus glabris.—
Cham, et Schlecht. in Linncea, v. 1. p. 25.
H ab. Island of St. Lawrence. Chamisso.—Of this plant, with which I am wholly unacquainted, Chamisso
and Schlechtendal say that it has a very peculiar habit in the absence of the radical tufts of leaves, the simple
stem, and in its smoothness and fleshiness.
17. D. glabella; foliis radicalibus oblongo-spathulatis, caulinis 2-4 ovatis dentatis vel
integris, omnibus caule pedicellisque laeviter substellato-pubescentibus, petalis (albis) calyce
glaberrimo plusquam duplo longioribus, siliculis— ?—Pursh, FI. Am. v. 2. p. 434 ? Rich,
in Frankl. ls£ Joum. ed. 2. p. 27.
H ab. Margins of alpine rivulets in the Rocky Mountains, between lat. 52° and 57°.' Drummond; and
north in the plains. Dr. Richardson. Hudson’s Bay. Pursh.—This has more the habit of D. crassifolia
than of the following; but it is three or four times the size, and has flowers as large as any in the genus.
The siliculse I have not seen.
18. D.confusa; caule folioso subramoso pube stellata. breyi velutino, foliis oblongis
subdentatis, siliculis oblongis pubescentibus pedicello longioribus. DC.—“ Ehrh. Beitr. 7.
p. 155.” De Cand. Prodr. v. 1. p. 170.
Hab. Rocky Mountains, from lat. 52°; and north in the plains, nearly to the mouth of the Mackenzie
River. Drummond. Richardson.—This too is a very variable plant, in respect to the number of leaves on its
stem, their shape and margin, (entire or toothed,) and the pubescence of the whole plant. It insensibly
passes into the following species.
19. D. incana; caule folioso simplici vel ramoso ;pube stellata velutino, foliis ov.atis
dentatis, siliculis oblongis glabris vel pubescentibus contortis yel strictis.
*. caule erecto stricto.—D. incana. Linn. Sp. PI. p. 897, Engl. Bot. t. 388. FI. Dan.
t. 130. Pursh, FI. Am. v. 2. p. 434.—D. contorta. Ehrh.—De Cand. Prodr. v. 1. p. 170.
/3. caule flexuoso.
Hab. *. Labrador. Pursh. Mr. Morrison. Bear Lake and the Mackenzie River. Dr. Richardson.
•0- North-West coast of America. Mr. Menzies. Islands of St. Lawrence and Unalaschka. Dr. Fischer._
The more usual state .of D. incana, such as we find it in the north of England and in Scotland; we have only
from Labrador and about Bear Lake. The specimens from the N. W. coast, gathered by Mr. Menzies, will
probably prove distinct, both from it and D. confusa; for their habit is very different. I possess the same
plant from the stations above quoted, sent by Dr. Fischer, with the name “ D . borealis. DC.?” This latter
is a Kamtschadale plant, communicated by the same liberal Botanist to De Candolle, who, however,
describes it as having only one leaf upon the stem, whereas the plant in question has several. I have seen
no fruit.
20. D.arabizans; caule folioso subramoso subpuberulo, foliis lanceolatis aciitis dentatis,
siliculis linearibus glabris pedicello longioribus.—Mich. Am. v. 2. p. 28. Pursh, FI.
Am. v. 2. p . 134.
H ab: Lake Champlain. Michaux. Canada.Pursh? Goldie?—What I possess, under this name, gathered
in the neighbourhood of Montreal by Mr. Goldie, is, I think, only D. incana, and I strongly suspect such
to be the plant of Michaux. Pursh seems to have confounded Michaux’s D. arabizans with the Alyssum
dentatum of Nuttall, as already noticed.
21. D. TJnalaschkiana; caule folioso simplici pubescente, foliis ovato-oblongis integris
pubescentibus, siliculis oblongis hirsutulis.—De Cand. Syst. Veget. v. 2. p . 350, Prodr. v.
1. p . 170.
H ab. Unalaschka. Dr. Fischer in De Cand.—“ Petala calyce duplo longiora, limbo obovato emar-
ginato.” D C.
■ 22. D. aurea; pubescens, caule erecto folioso, foliis lanceolatis ovato-lanceolatisve
acutis integris dentatisve, corymbis terminalibus axil'laribusque, siliculis oblongo-lanceolatis.
pubescentibus pedicello triplo longioribus, petalis (flavis) emarginatis, stylo Iono-ius-
culo. Vahl—Fl. Dan. t. 1460. De Cand. Prodr. v. 1. p. 170. Hook, in Bot. Mag. t. 2934.
Hab. Alpine prairies of the Rocky Mountains. Drummond.—Well distinguished by its bright conspicuous
yellow flowers and lateral pedunculated corymbs, springing from several of the upper leaves of the stem.
One specimen in the collection has white flowers.
23. D. lutea; pubescens, caule ramoso folioso, foliis ovalibus caulinis lanceolatis dentatis,
siliculis elliptico-oblongis glabris sub 30-spermis pedicello sub-triplo brevioribus,
(floribus luteis.)—« Gilib. FI. Lith. in TJst. del Op. 2. p. 357.” Nutt. Gen. Am. v. 2. p. Q2.
De Cand. Prodr. v. 1. p. 171.
/3. longipes. -DC.—-Pedicellis silicula 4-plo longioribus.'—D. gracilis. Graham in Edin.
Phil. Joum. 1828. p. 172.
H ab. Low grounds from lat. 56° to 66° ; Dr. Richardson; Drummond; both «. and 0.—It has been
correctly observed that this differs from the following species only in its glabrous capsules.
24. D. nemoralis; pubescens,. caule ramoso, foliis ovalibus caulinis lanceolatis dentatis,
siliculis elliptico-oblongis pubescentibus. sub 30-spermis pedicello subtriplo brevioribus.
Ehrh.—De Cand. Prodr. v. 1. p . 171.—D. muralis, /3. nemorosa. Linn. Sp. PI. p. 897.