teati, pedicellati, albi, interdum atro-purpureo-reticulati.—Genus satis distinctum, defectu dissepimenti, funi-
culis elongatis, glandularum absentia, staininibus subsequalibus. Affine Eutremati R. Brown, at uti nobis
videtur, satis ab illo recedens.”
IIah. Among loose stones, on the high alpine mountains of the Island of Unalasohka. Chamisso.
26. PLATYSPERMUM. Nov. Gen.
Silicida ovalis, dorso compressa, plana, stigraate sessili. Semina pauca, latissime mar-
ginata. Cotyledones incumbentes.— Herbae parvoe, annua. Folia radicalia. Scapi
numerosi, uriiflori.
1. P. scapigerum. (Tab. XVIII. B.)
Radix annua, parva, subfusiformis, parce fibrosa. Folia omnia radicalia, patentia, subruncinato-pinnatifi da,
lobis plerumque acutis, inferne sensim minoribus, in petiolum attenuata, subcarnosa, glabra. Scapi plurimi
ex eadem radice, digitales, erecti, simplices, glaberrimi, semper uniflori. Flos parvus, erectus. Cal. e
sepalis quatuor ovalibus, concavis, glabris. Petala oblongo-obovata, alba, vix unguiculata, calyce paulo lon-
giora. Siam. 4, tetradynama: Filamenta filiformia, edentula: Anther a parvse, subrotundatae, flavae. Pistil-
lum: Germen ellipticum, tereti-compressum, stigmate bilobo terminatum. Silicula exacte ovalis, sessilis,
plano-corapressa, bilocularis; dissepimento completo; loculis subtetraspermis. Semina (vix matura) subrotunda,
parva, margine membranaceo, albo, latissimo cincta. Podospermum longiusoulum, gracile. Embryo:
Cotyledones piano-con vexa?, incumbentes.-----
Hab. Moist rocks and in shallow soil at the Great Falls of the Columbia. Douglas. FI. March, April.—
This highly interesting plant cannot be compared with any genus with which I am acquainted. The general
appearance of its silicula is indeed similar to that of Draba ; but the seeds and embryo are widely different,
while the single-flowered scapes are, as far as I know, an anomaly among Cruciferous plants.
Tab. XYIII. B. Plant:—natural size. Fig. 1, Flower; Jig. 2, Petal; fig. 3, Stamen; fig, 4, Pistil; fig.
5, Silicula; fig. 6, Do. with a valve partially removed; fig. 7, Seed; fig. 8, Embryo:—magnified.
T rib. VI. 1/EPiDiNEiE, seu Notorhizeae Angustiseptae. Silicula septo angustissimo, valvis
carinatis aut valde concavis. Semina in loculis solitaria aut pauca, ovata, immarginata.
Cotyledones plana incumbentes (nisi in Lepidiis quibusdam,) septo parallela. DC.
27. LEPIDIUM. Linn.
Silicula ovata aut subcordata, valvis carinatis aut rarius ventricosis, dehiscentibus,
loculis 1-spermis. Semina subtriquetra aut compressa. (Cotyledones nonnunquam accum-
bentes.)—Flores albi. DC.
1. L. ruderale; floribus diandris apetalis, foliis radicalibus caulinis pinnatifidis Incisisve
rameis linearibus integerrimis, siliculis (parvis) lato-ovalibus emarginatis patentibus, coty-
ledonibus incumbentibus.—Linn. Sp. PI. p. 898. Engl. Bot. 1.1595. De Cand. Prodr. v. 1.
p. 205. Rich, in Frankl. Joum. ed. 2. App. p. 27.
Hab. From Hudson’s Bay to the Pacific, and from lat. 50° to 68° ; in waste places. Dr. Richardson ;
Drummond; Scouler; Douglas.—The leaves, even the lower ones, are more incised than pinnatifid, in which
respect alone they differ from the Engl. Bot. figure, and from that in FI. Dan. t. 184. Stems upright, a foot
high, much branched. Petals none. Siliculce small. Cotyledons decidedly incumbent.
2. L . Menziesii; floribus diandris apetalis, foliis radicalibus bipinnatifidis, caulinis
rameisque plurimis pinnatifidis, supremis linearibus integerrimis.
*. foliis radicalibus hispidis. De Cand. Syst. Veget. v. 2. p . 539, Prodr. v. 1. p . 205.
p. foliis radicalibus pubescentibus.
Hab. a. California. Mr. Menzies. fi. Upon the eastern declivity of the Rocky Mountains, lat. 52°, 56°.
Drummond.—This has the pinnatifid stem-leaves of the British L. ruderale; but the radical leaves are bipin-
natifid, and in a. remarkably hispid. De Candolle assimilates it to L. virginicum, which again leads me to
think that he has confounded that plant with the more frequent ruderale, to which the present is, I fear, too
closely allied. Cotyledons decidedly incumbent.
3. L . virginicum i floribus 2—3-andris tetrapetalis, foliis caulinis lineari-lanceolatis in-
ciso-serratis, siliculis ovali-orbicularibus (majusculis) emarginatis patentibus, cotyledoni-
bus accumbentibus. Linn. Sp. PI. p. 900. Mich. Am. v. 2. p . 27. Pursh, FI. Am. v. 2. p.
435. Elliott, Carol, v. 2. p . 140.—L. Iberis. Schkuhr, Handb. v. 2. t. 180.
Hab. Canada ? I have not, it must be confessed, any British American specimens of this plant: nor can
I aver that it is a native of that country: but as I possess it from the New England States, I can scarcely
doubt but it exists in Upper Canada. All that I have yet received from Canada, as L. virginicum, prove,
however, to be L. ruderale; to which, indeed, this plant bears so close a resemblance, that, without an examination
of the embryo, they can scarcely be distinguished. In the present species, the cotyledons are truly
accumbent, as represented by Schkuhr. Hence De Candolle has probably confounded the L. ruderale with
it, for he describes the cotyledons as incumbent. The flowers are extremely small, and bear petals. The
siliculce are larger, and perhaps more nearly orbicular, and the plant is less profusely branched.
28. CAPSELLA. Vent.
Silicula triangularis basi cuneata, valvis navicularibus apteris, loculis polyspermis.
Cotyledones incumbentes.
1. C. Bursa-Pastoris.—“ Mcench, Meth. 271.” De Cand. Prodr. v. 1. p. 177.—Thlaspi
Bursa-Pastoris. Pursh, FI. Am. v. 2. p. 435. Elliott, Carol, v. 2. p. 141. Engl. Bot. t. 1485.
Hab. Frequent to the eastward of the Rocky Mountains, extending as far north as the Great Bear Lake,
or nearly to the Arctic Circle. Dr. Richardson; Drummond; Douglas. Newfoundland. Mr. Cormack.
T r ib . V I I. I satide-®, seu Notorhizeas Nucamentacese. Silicula valvis indistinctis aut indehiscenlibus
carinatis, septo evanido, 1 -hcularis, 1 -sperma. Semina ovato-oblonga. Cotyledones
plana, incumbentes, septo (si adesset) verosimiliter parallela. DC.
29. THYSANOCARPUS. Nov. Gen.
Silicula obovata, plano-convexa, undique latissime marginato-alata, apice emaroinata,
unilocularis, evalvis, monosperma. Semen late obovatum, pendulum. Radicula insertione
dorsalis, obliqua et ad margines cotyledonum applicata.— Flores parvi, albi, racemosi.
Siliculae pendula.—Genus Tauscherise affinis. An vere distinctum ?
1. T. curvipes. (T ab. XVIII. A.)
Radix parva, annua, subfusiformis. Caulis solitarius, plerumque ramosus, erectus, 6- 8-pollicaris ad
pedalem, parce foliosus, inferne subpilosus. Folia plerumque radicalia, patentia, duas uncias longa, pinnati-
fida, hirsuto-scabra, laciniis brevibus, obtusis, basi attenuata. Caulina remota, lineari-oblonga, basi latiora,
subsagittata, superiora sensim minora. Flores racemosi, parvi, ramos terminantes. Pedicelli floribus paulu-
lum longiores, graciles, glaberrimi, patentes, demum, fructiferi, insigniter deflexi et elongati. Calyx: sepala
sequalia, ovalia, convexa, glabra, erecto-patula. Petala minuta, lineari-oblonga, basi attenuata, integra, alba,
sepalis breviora. Stamina 6, tetradynama: Filamenta filiformia, edentula: Antherce subglobos». Germen