bus, foliis oblongis integris basi attenuatis pubescentibus. DC.—Schlecht. in Herb. Willd.
—De Cand. Syst. Veget. v. 2. p. 355. Ejusd. Prodr. v. 1. p. 174.
TTab, Rocky places in Unalaschka. {Herb. Willd.)—Chamisso, who did not find this plant in Una»
lasnhka, says of it, that it is very nearly allied to the preceding, differing only in the entire lanceolato-oblong
leaves and longer silicidce.
T rib. III. T hlaspideas seu Pleurorhizeae Angustiseptse. Silicida dehiscens, septo angus-
tissimo, valvis carinatis navicularibus. Semina ovalia, interdum marginata. Cotyledones
planes, accumbentes (o= ), septo contraries.—Tribus distinctissima, cum Lepidineis solum
con/erenda, sed distincta seminibus magis compressis et cotyledonibus accumbentibus. DC.
15. THLASPI. Linn.
Silicida apice emarginata, valvis navicularibus dorso alatis, loculis 2-poly-spermis.
Petala sequalia. Cal. basi aequalis.—Flores albi. DC.
1. T. arvense; foliis oblongis dentatis, caulibus erectis, siliculis obovato-orbiculatis
pedicello brevioribus. DC.—Linn. Sp. PI. p. 901. Engl. Bot. t. 1659. Pursh, FI. Am.
v. 2. p . 435. De Cand. Prodr. v. 1. p . 175.
H ab. Canada. Mrs. Shepherd; but not general in the country.
2. T. montanum; foliis subcarnosulis integris, radicalibus obovatis petiolatis, caulinis
oblongis sagittato-amplexicaulibus, petalis calyce majoribus, siliculis obcordatis 4-spermis,
stylo filiformi. DC.—Linn. Sp. PI. p. 902. De Cand. Prodr. v . l . p. 176.—(T. prsecox.
Wulf. et T. alpinum. Jacq.)'
H ab. Shores of the Arctic Sea, to the westward of the Mackenzie River; Capt. Sir John Franklin and
Capt. Back. One specimen was sent with T. alpestre, from Canada, by Mrs. Percival.
3. T. cochleariforme; foliis subcarnosulis, radicalibus petiolatis ovatis subdentatis,
caulinis cordato-amplexicaulibus, petalis calyce majoribus, siliculis oblongis subemargin-
atis 8-spermis, stylo brevi filiformi.—De Cand. Syst. Veget. v. 2. p. 381, Prodr. v. \ . p. 176.
De Less. Ic. v. 2. t. 52.
■ H ab. Common on the subalpine ridge of the Blue Mountains, and those of the Flat-head River, on the
south branches of the Columbia. Douglas.—Except in the larger size of this plant, and in the more
numerous seeds of the cells, it scarcely differs from the preceding.
4. T. alpestre; foliis integris vel obscure dentatis, radicalibus ovatis petiolatis, caulinis
oblongis amplexicaulibus, petalis calyci subsequalibus, siliculis obcordatis 8-12-spermis,
stylo filiformi. DC.—Linn. Sp. PI. p. 903. Engl. Bot. t. 81. De Cand. Prodr. v . l . p. 176.
Hab. Canada. Mrs. Percival.
16. HUTCHINSIA. Br.
Silicula elliptica, valvis navicularibus apteris, loculis 2-spermis, rarius polyspermis.
Cal. aequalis. Pet. sequalia. DC.
H. calycina; cano-pubescens, foliis plerumque radicalibus profunde pinnatifidis longe
petiolatis, calycibus persistentibus, siliculis oblongis utrinque attenuatis stylo acuminatis.
(T ab. XVII. f . B.)—Desv. Joum. Bot. v. 3. p. 168. De Cand. Prodr. v. 1. p. 178.—Lepi-
dium calycinum. Steph. in Willd. Sp. PI. v. 3. p. 433..
/3. foliis inferioribus omnino integris.
Radix lignosa, subfusiformis, longissime descendens, hie illic fibrosa, supeme divisa. Caulis brevis, vix
digitalis, canescens. Folia plerumque radicalia, longe petiolata, profunde pinnatifida, fere pinnata, inferiora
nonnunquam, in var. /3. prsecipue, integerrima, spathulata, incana, pubescenti-tomentosa, juniora prsecipue,
laciniis linearibus acutiusculis vel obtusis; caulina pauca, minora, laciniis paucioribus. Flores albi, suavis-
simi, dense corymbosi, pedicellos longitudine subaequantes. Calyx brevis; sepalis lato-ovatis, valde conca-
vis, albo-marginafis, dorso valde pilosis. Petala obovata, sublonge unguiculata, obscure nervosa. Stamina
edentula. Anther at subrotundse. Germen oblongum, subhirsutum, supeme stylo brevi attenuatum. Stigma
parvum, capitatum. Fructus abest.
Hab. On the Rocky Mountains, between lat. 52° and 57°.—/3. Cape Mulgrave in Behring’s Straits. Lay
and Collie in Capt. Beechey's Collection.—Our specimens from the Rocky Mountains agree in every particular
with the Altai plant, which I have received from Dr. Fischer. Those from Cape Mulgrave have
sometimes all the radical leaves, and occasionally some of the cauline ones, entire.
T rib. IV. Cakilineae seu Pleurorhizeas Lomentaceee. Siliqua aut silicula transverse
in articulos \-2-loculares, \-2-spermos secedens. Semina immarginata. Cotyledones
planes, accumbentes (o—), septo (dum adsit) par alleles. DC.
17. CAKILE. Linn.
Silicula biarticulata, compressa, articulo superiore ensiformi aut ovato. Semina in
loculis solitaria, superioris erectum, inferioris pendulum. DC.
1. C. edentula; siliculae articulo superiore ovato acuto edentulo.—Bunias edentula.
Bigel. FI. Bost. ed. 1. (1814,) p. 157, ed. 2. p . 251.—Cakile segyptiaca. Tussac, FI. des
Antilles, v. 1. p. 17. (fide De Cawd)—C.americana. Nutt. Gen. Am. (1818,). v. 2. p. 62.
De Cand. Prodr. v. 1. p . 185.—Bunias maritima. Pursh, FI. Am. v. 2. p. 434.
Hab. Canada. Pursh. Strand of the sea coast, and also on the shores of the great northern lakes of the
St. Lawrence. Nuttall.—First distinguished in North America by Professor Bigelow, whose name I therefore
retain. I have never seen specimens. According to De Candolle, it extends to the West Indian Islands.
Subord. II. Notorhizeas (o J|). Cotyledones planes, incumbentes. Radicula dorsalis,
nempe medio dorso cotyledonum incumbens. Semina ovata. DC.
T rib. V. Sisymbreas seu Notorhizeas Siliquosae. Siliqua bilocularis, longitudinaliter
dehiscens, valvis conoavis carinatisve. Semina ovata aut oblonga, immarginata. Cotyledones
planes, incumbentes, septo contraries.— Tribus distinctissima ex characteribus sper-
micis, sed habitu ad Arabideas accedens. DC.
18. HESPERIS. Linn.
Siliqua teretiuscula aut subtetragona (vel compressa). Stigmata duo, erecta, conniventia.
Cal. basi bisaccatus. Semina subtriquetra. Stamina edentula. DC.
1. H. matronalis; pedicellis calycis longitudine, petalis obovatis, siliquis erectis torosis
glabris margine non incrassatis, fpliis ovato-lanceolatis dentatis, caule erecto subsimplici.
DC.—Linn. Sp. PI. p. 927. (et H. inodora. Ejusd. et Engl. Bot. t. 731.) De Cand. Prodr.
v. 1. p. 189.
Hab. Shores of Lake Huron. Dr. Todd.
h 2