lata; obiusa, inferne pauiulum attenuata, utrinque margineque pilosa, pills plerumque simplicibus. Scapi
plurimi ex eadem radice, vix digitem longi, pubescentes, omnino apbylli. Flores majusculi, albi, fragrantes,
primum in corymbum compactum dispositi, demum racemosi. Pedicelli breves, vix calyce longiores. Sepala
late ovata, concava, sequalia, margine glabro, membranaceo, dorso pubescente. Petala calyce duplo longiora;
ungue angusto calyce breviore, lamina fere orbiculari, subretusa. Stamina calycem vix longitudine exce-
dentia. Antherce breves, subrotundse. Germen fere exacte ovale, dense pubescenti-pilosum, biloculare,
valvis valde convexis, stylo subdimidio breviore terminatum. Stigma dilatatura, obscure bilobum. Semina
seu ovula sub-8, quoque loculo biserialia.
Hab. Found only on the sandy shores of the Arctic Sea, at the mouth of the Mackenzie River, lat. 70°.
Dr. Richardson.—It is much to be regretted that so interesting a plant as the present, found only in one
spot, and that not likely to be again visited by men of science, should be wanting in the very part of the fructification
by which alone its genus can be satisfactorily determined. In habit it agrees almost equally well
with Platypetalum as with Braya; but the flowers are larger and far more showy than either, while the germen,
and, I may add, the remains (a dissepiment) of a former year’s capsule, agrees in its comparative
length and breadth better with the former than with the latter: but the valves of the germen are remarkably
convex, and the style is more than half its length; so that, in all probability, it ought to constitute a new
genus. Dr. Richardson compares the smell of the blossoms to that of Lilac.
Tab. XVII. A. Plant -.—natural size. Fig. 1, Flower; fig. 2, Petal; fig. 3, Stamen; fig. 4, Germen; fig.
5, More advanced germen; fig. 6, The same, with the valve (fig- 7) removed, to show the ovules, or
young seeds; fig. 8, Leaf:—moreorless magnified.
23. PLATYPETALUM. Br.
Silicula ovalis, pblyspefma, valvis convexis. Stylus brevissimus. Ccdyx subpatens. Pet-
alorum lamina dilatatee. Cotyledones incumbentes. Br.
1. P . purpurascens ; stigmate bilobo patenti, stylo manifesto, scapis nudis vunifoliisque
pubescentibus, siliculis glabriusculis. (Tab. X X IIIOfi^-Br. in Parry’s ls£ Voy. App. p.
cclxvii.—Braya arctica. Hook, in Parry's 2d Voy. App. p. 387.
Hab. Arctic shores and islands of America. Capts. Ross, Parry, Sabine; Dr. Richardson; extending
even to Spitsbergen, at Hecla Cove. ( Capt. Parry.')—So completely has this the habit of Braya, that, without
the perfect fruit, it is scarcely possible to distinguish it. Mr. Brown has admirably described it, both
generically and specifically, and there remains nothing for me but give a figure, which I have done, in part from
Melville Island specimens, gathered by Captain James Ross, and in part from Dr. Richardson’s, which are
generally larger, and have the fruit more oblong in most instances, as seen at C, and fig. 6.
T ab. XXIII. A, B, et C. Pitotsi- tia tu r td S iz e : F ig . 1, Flower; f i g . 2, Petal; f i g . 3, Stamen; f i g .A , Germen
; f i g . 5, 6, Capsules; f i g . 7, Seed; f i g . 8, Section of seed; f i g . 9, Embryo:—m a g n ified .
2. P . dubium; stigmate indiviso subsessili, siliculis scapisque pubescentibus.—Br. in
Parry's lsf Voy. App. p . cclxvii.
Hab. Melville Island. Capt. Sabine.—K Floribus ignotis, dubi* generis planta, cujus examplaria tria in
Herb. D. Sabine exstant. Cotyledones certe incumbentes et lineares, basibus tamen crus radiculare embry-
onis vix occupahtibus.” Br.
24. EUTREMA. Br. '
Siliqua (abbreviata) anceps, valvis carinatis, dissepimento (nonnunquam) incompleto.
Cotyledones incumbentes.—(Herba habitu omnino Brayse et Platypetali, quibus maxime
affine genus, distinguendum facile siliqua ancipiti) dissepimento incompleto, et seminum funi-
culis. Br.)
1. E. Edwardsii; siliculis lanceolatis, dissepimento obliterate, foliis ovato-lanceolatis
longe petiolatis.—Br. in Parry's Voy. App. p. cclxvii. t. a. Hook, in P a r r fs 2d Voy.
App. p. 388.
Hab. Arctic Sea-shore and Islands: first found in Melville Island by Mr. Edwards and other officers
of Captain Ross’s Expedition. Coast, eastward of the Coppermine River. Dr. Richardson.—The admirable
description and the inimitable figures of this plant, given by Mr. Brown in the Appendix to Captain
Parry’s First Voyage, leave nothing for me to notice, save that the fructified specimens sometimes attain,
if they do not exceed, a foot in length.
2. E. arenicola; siliculis lato-linearibus, dissepimento completo, foliis obovato-spathu-
latis. (Tab. XXIV.)—Richardson's MSS.
Radix perennis, fiisiformis, inferne fibrosa, superne s*pe multicaulis. Caules plerumque breves, sed non
raro innovationibus elongati, ad apicem dense foliati. Folia in rosulam expansa, obovata, longe petiolata,
subcarnosa, glabra, integerrima vel parce deutata, viridia vel purpurascentia, petiolis subunciam longis, basi
dilatatis, membranaceis. Scapi digitales, foliosi, foliis subsessilibus obovatis, plerumque integerrimis. Flores
in corymbo parvo dispositi. Calyx e foliolis 4, basi sequalibus, erectis, late ovalibus, obtusis, glaberrimis, sub-
vindi-purpureis. Corolla: Petala obovata in petiolum attenuata, alba, calyce duplo longiora. Stamina 6.
Filamenta filiformia, alba: Antherce parv*, subrotund*, didym*, flavae. Siliqua abbreviate, seu silicula 6-8
.tineas long*, in racemum disposit*, pedicello vix duplo longiores, brevissime stipitat*, lato-lineares, aneipiti-
subcompress*, viridi-fusc*, stigmate subcapitato fere sessili terminate. Valva sub lente obscure reticulatim
venQs*, dorso carinate, uninerves. Dissepimentum completion, membranaceum, album, nonnunquam (non
semper) tinea media obscura longitudinali notatum. Semina numerosa, 16-20 singulo loculo, subovalia,
pallide rufo-fusca,' immarginata. Podospermum breve, gracile. Embryo luteus. Cotyledones piano-compress*,
pauiulum canaliculate, incumbentes.
Hab. Deep sand upon the shores of Arctic America, between long. 107° and 150°. Dr. Richardson.
Capt. Sir John Franklin and Capt. Back.—This has so entirely the habit of Eutrema Edwardsii, that, notwithstanding
the absence of Mr. Brown’s most essential character of that genus, namely the incomplete
dissepiment, I cannot hesitate about referring it there. From its place of growth, in deep and moving sand,
the stems, which are naturally short, present a singular appearance. In the spe,cimen here figured, for
example, the stems are remarkably elongated, and exhibit innovations of four years’ growth; each year’s
shoots having been covered with sand, the succeeding shoots were elongated that the leaves and flower-stalks
might rise to the surface. The stalks which produce flowers I consider to be scapes, because, though bear in«1
several leaves, they die down to the root-stems annually.
Tab. XXIV. Plant -.—natural size. Fig. 1, Flower; fig. 2, Petal; fig. 3, Stamens; fig. 4, Pistil; fig. 5,
Siliqua; fig. 6, Section of do.; fig. 7, Do. with a valve removed; fig. 8, Section of a valve; fig. 9,
Seed; fig. 10, Embryo; fig. 11, Section of the embryo:—magnified.
25. OREAS. Cham, et Schlecht.
Cal. basi asqualis, laxus. Pet. integra, unguiculata, aequalia. Filamenta sequalia, eden-
tula. Stylus brevissimus, stigmate capitato. Silicula, lanceolata, compressa, unilocularis,
septo nullo, valvis planiusculis, nervo medio notatis. Semina plura, ovoidea, funiculis
umbilicalibus elongatis e supdra parte nervi placentarii dependentia, cotyledonibus incum-
bentibus. Cham, et Schlecht.
1. O. involucrata.— Cham. et Schlecht. in Linncea, v. 1. p. 29. t. 30.
“ Herba parva, alpina, perennis, habitu Cardamines bellidifolia. Folia radicalia, petiolata, glabra,
caulina nulla; bractea sub pedicellis conferte, inyolucrum mentientes. Flores brevissime racemosi, bratv