Frankl. ls£ Joum. ed. 2. App. p. 25. Cham, et Schlecht. in Linnaa, v. 1. p . 15.—Erysimum
prsecox. Engl. Bot. t. 1129.
Hab. Banks of rivers; abundant from Canada to lat. 68°. Drummond. Dr. Richardson.—Pods 2-3 inches
long, linear, compressed, with a dorsal nerve to the valve. Stigma short, nearly as broad as the valve.
4. TURRITIS. Linn.
Siliqua linearis; valvis planis. Semina in quoque loculo biserialia.—Flores albidi vel1
purpureo-rosei.
1. T. glabra; erecta, foliis radicalibus petiolatis dentatis pilis ramosis pubescentibus,
superioribus lato-lanceolatis sagittatis glabris semiamplexicaulibus glaucis, siliquis anguste
linearibus erectis strictis, petalis vix calyce longioribus.—Linn. Sp. PI. p. 930. Engl. Bot.
t. 777. De Cand. Prodr. v. 1. p. 142. Rich, in Frankl. 1st Joum. ed. 2. App. p. 26.
Hab. Hudson’s Bay to the Rocky Mountains, and as far north as lat. 64®. Dr. Richardson. Drummond.—
Two or three feet high, often much branched. Leaves 4-6 inches long, broadly lanceolate, with two blunt
points at the base pointing downwards; hence they are sagittate, entirely glabrous, and mostly quite entire.
Flowers small, pale sulphur-colour. Pods 4 inches long, very slender. Style short, stigma two-lobed, seeds
in two series.
2. T. mollis; erecta, foliis inferioribus spathulatis sinuato-dentatis, superioribus lanceo-
lato-sagittatis integerrimis, omnibus eaule erecto ramoso pedicellisque pilis numerosis
patentibus molliter hirsutis, siliquis lineari-elongatis erectis strictis.
Radix annua, subfusiformis, ramosa. Caulis erectus, superne ramulos plurimos proferens, molliter hirsutus.
Folia radicalia patentia, spathulata, petiolata, obtusa, grosse sinuato-dentata: caulina lanceolato-sagittata,
basi semiamplexicaulia, obtusa, integerrima, pubescenti-hirsuta, pilis ramosis stellatisque. Flores albi, dense
capitato-corymbosi. Pedicelli fructus longiusculi, pilosi, pilis patentibus. Calyx etiam pilosus. Petala
cuneata, calyce subduplo longiora. Siliquee, vix mature, anguste lineares, unciam et ultra longse, rectse vel
leviter curvate. Stylus perbrevis, angustatus. Stigma minutum, obscure bilobum. Semina biserialia.
H ab. Shores of the Arctic Sea, between long. 107° and 130°. Dr. Richardson.—A foot and more high;
stem stout. Habit of some states of Arabis hirsuta, but the seeds are unquestionably in two rows, and the
whole plant is clothed with soft hairs, rather short on the leaves, much longer on the petioles, stem, branches,
and pedicels. This plant exists only in Dr. Richardson’s collection from the shores of the Arctic Sea. It is
perhaps allied to T. hispidula of D C. (Arabis andicola of Dumb, et Kunth) : ljut that plant has the leaves
rough with flocculose down, and is an inhabitant of the Andes of Quito.
3. T. stricta; erecta, glabra, foliis lanceolatis, radicalibus petiolatis dentatis, caulinis
sagittatis semi-amplexicaulibus subdentatis, floribus siliquisque linearibus elongatis erectis
strictis.—Graham in Edin. New Phil. Joum. July, 1829. p. 7.
Habitus precedentis, sed gracilior. Radix annuus. Caules 1-plures ex eadem radice, erecfee, glabra.
Folia omnia (ut et tota planta) glaberrima, nisi quandoque in parte inferiore foliorum radicalium et petiolis,
ubi obscure pilosa et ciliata. Flores albi. Petala obovata, emarginata, calyce duplo longiora. Siligua' 2-3
uncias longa, sublato-linearis, stylo brevi, valvis multo angustiore. Stigma vix incrassatum, minutum, obscure
bilobum.
H ab. Prairies of the Rocky Mountains, between lat. 52° and 56°. Drummond. About Fort Vancouver
on the Columbia. Douglas.—Flowers pure white, erect as well as the fruit.
4. T.patula; erecta, foliis lanceolatis, radicalibus petiolatis dentatis, caulinis sagittatis
semi-amplexicaulibus glabris subdentatis, floribus siliquisque linearibus elongatis paten-
tissimis.—Graham in Edin. New Phil. Joum. July, 1829. p . 7. (not Ehrh. nor Willd.)
x. foliis radicalibus parce pubescentibus.
p. foliis radicalibus pubescenti-incanis subintegris.
Facies T. stricta; differt insigniter, etiam in cultu, floribus siliquisque patentissimis.
Flores majusculi, pulcherrime purpureo-rosei.
H ab. *. From Canada to lat. 68®, and from Hudson’s Bay to the Rocky Mountains. Dr. Richardson.
Drummond; and even to Fort Vancouver on the Columbia. Douglas. Scouler. 0. Highest summits of the
Rocky Mountains. Drummond.—Pods long, curved. Professor Hornemann has sent me the var. 0. from
Greenland.
5. T. retrofraota; erecta, incano-pubescens vel glaber, foliis lanceolatis, radicalibus
petiolatis dentatis, caulinis sagittatis semi-amplexicaulibus glabris subdentatis, floribus
cernuis, siliquis linearibus elongatis pedicellisque retrofractis.—Arabis retrofracta. Graham
in Edin. New Phil. Joum. July, 1829. p. 1.
H ab. Hudson’s Bay to the Rocky Mountains; and from Canada to lat. 68° ; at the Mackenzie River.
Dr. Richardson. Drummond.—This is at once distinguishable from the two preceding species, which are its
near allies, by the deflexed flowers, (which are mostly pure white, or with a faint purplish tinge,) and by the
retrofracted pedicels and pods. The seeds are in two rows, or series, in a young state, and are then quite
pendent; afterwards, by their enlargement, they lie more horizontally in the cell, and form but one series as
Dr. Graham remarks: but it would be better to abolish one of the two genera, than, by putting this into
Arabis, to separate it from T. stricta and T. patula, with which it is so closely and so naturally allied.
6. T. ? diffusa; glaberrima, glauca, caulibus ramosis diffusis, foliis radicalibus spathulatis
subintegris, caulinis sagittatis vix dentatis, siliquis linearibus patentibus pedicello
duplo longioribus.
Radix parva, subfusiformis, ut videtur, annua. Caules plurimi ex eadem radice, diffusi, glabri, ramosi,
subspithanuei. Folia radicalia plurima, in rosulam expansa, parva, spathulata, subintegerrima, petiolo lon-
giusculo: caulina majora, subunciam longa, oblonga vel lanceolata, basi dilatata, sagittata, apice obtusa, mar-
gine integerrima, vel, hie illic, dente instructa, glaberrima, glauco-viridia. Flores, parvi. Calyx glaber
sepalis ovalibus, sequalibus, pedicello glaberrimo triplo brevioribus. Petala calyce dimidio longiora, alba,
obovata, unguiculata. Siligua vix unciam longse, patentes, lineares, obtusse, stigmate parvo subsessili terminate,
nondum mature sernina seu ovula in duas lineas disposita, exhibentes.
H ab. Shores of the Arctic Sea. Dr. Richardson.—This may probably prove an Arabis; but in the
scarcely mature seed-vessels two rows of ovules are evident, which, however, may, as in T. retrofracta,
when ripe, arrange themselves in one series. But whether an Arabis or a Turritis, I know of no species
with which it can be confounded. It is probably scarce, as few specimens exist in the collection, and those
only in Dr. Richardson’s portion of it.
5. ARABIS. Linn.
Siliqua linearis; valvis planis medio uninerviis. Semina in quoque loculo 1-seralia
ovalia aut orbicularia, compressa. Cotyledones planse. (o==;) Flores albi, aut rarius
rosei. DC. ■
* Semina immarginata, seu parva ala membranacea cincta. DC.
1. A. alpina; subdiffusa, ramosa, foliis pluri-dentatis pube ramosa villosis lanceolatis
acutis, radicalibus subpetiolatis,. caulinis cordato-amplexicaulibus, pedicellis calyce