S e c t . II. S o r b u s . DC.
-P' Americana; foliis pinnatis, foliolis oblongis acutis subæqualiter serratis demum
glabris, pomis globosis (purpureis, Ph., fulvis, Torrey.)—De Cand. Prodr. v. 2. p. 637._
Sorbus Americana. Pursh, FL Am. v . l .p. 241. Bigel. Fl. Bost. ed. 2. p. 194. Taney, Fl. of
Un. St. v. 1. p . 476.—Sorbus aucuparia, 13. Mich. Am. v. 1. p. 290.
Hab. Canada, (Michaux,) and throughout the woody country. Dr. Richardson. Newfoundland. Dr.
Morrison. North-West coast of America as far north as Observatory Inlet, (Menzies, Dr. Scouler,) and in
the subalpine regions of the high mountains. Douglas.—In the leaves and flowers I can perceive no difference
between this and the Europæan P. aucuparia : in the former plant they are doubtless very conspicuously
downy when young. Pursh says the berries are purple, not scarlet, as in the Europæan species. Torrey
says they are fulvous.. From the garden of the Horticultural Society of London, I possess a Pyrus of
North America, which appears to hold the same relation to P. Americana, that P. pinnatifida, Sm. and De
Cand., does with P. aucuparia, where the pinnules axe combined so as to form a lobed or pinnatifid and
simple leaf. Whether the P. microcarpa of Torrey, (P. aucuparia, «. of Michaux,) which has red fruit,
be different from this or its Europæan prototype, I am unable to say.
S e c t . III. A d e n o r a c h i s . DC.
3. P. arbutifolia ; foliis obovato-oblongis lanceolatisve crenato-serratis subtus pallidis reti-
culatim venosis costa supra glandulosa, floribus corymbosis.—a. foliis subtus præcipue ju-
nioribus calycibusque tomentosis, fructu rubro. P. arbutifolia^ Linn. fil. Suppl, p . 256.
Pursh, FI. Am. v. 1. p . 339. Bigel. FI. Bost. ed. 2. p . 195. De Cand. Prodr. v. 2. p. 637.
—Cratægus pyrifolia. Lam.—Mespilus arbutifolia. Linn. Sp. PI. p. 685.—a. erythrocarpa.
Mich. Am. v. 1. p. 292.—Aronia arbutifolia. Elliott., Carol, v. 1. p. 356. Torrey, FI. o f
Un. St. v. 1. p. 478.—A. pyrifolia. Pers.—/3. melanocarpa; foliis calycibusque glabris,
fructu nigro. Willd. Sp. PI. v. 2. p. 1013.—Mespilus arbutifolia, j8. Mich. Am. v. 1. p.
292.— Pyrus melanocarpa. Willd. Enum. p. 525. De Cand. Prodr. v. 2. p. 637. Pursh, FI.
Am. v. 1. p. 339.—Aronia arbutifolia, 13. Torrey, FI. o f Un. St. v. 1. p. 479.—Aronia
melanocarpa. Elliott, Carol, v. 1. p. 557.
Hab. Throughout Canada, from Lake Huron to the Saskatchawan. Newfoundland. Sir Alexander
Cochrane, Dr. Morrison.—I can by no means consider the P . arbutifolia, and melanocarpa of authors as
really distinct species.
Ord. X X X . ONAGRARIiE. fuss.
T rIB. I. ONAGRE2E.
1. EPILOBIUM.* Linn.
Calyx 4-phyllus deciduus. Petala 4. Stamina 8. Capsula linearis obtuse tetragona 4-
locularis 4-valvis polysperma. Semina numerosa, pendula, comosa. Lehm.—Herbte. Folia
opposita vel altema. Flores axillares, solitarii aut terminales, spicati, in spicis altemi et uni-
bracteati. Corollas purpurea, rosea, subcamea, rariter lutea. DC.
* The arrangement of the individuals of this and the two following genera, Gaura and (Enothera, together with
the descriptions of the new species, have been kindly undertaken by Professor Lehmann of Hamburgh.
S e c t . I. C h a m æ n e r io n . Petala integra, genitalia declinala.
1. E. angustifolium ; caule erecto subsimplici glabro, ' foliis subsessilibus angusto-lanceo-
latis subintegerrimis undulatis pellucido-venosis, floribus spicato-racemosis bracteatis, stylo
reflexo basi piloso staminibus breviore. Linn. Sp. PI. p. 493. Engl. Bot. t. 1947. Pursh,
FI. Am. v. 1. p . 259. Rich, in Frankl. ls£ Joum. ed. 2. App. p . 12.—E. spicatum. Lam.
Diet. v. 2. p . 373. Torrey, FI. o f Un. St. v. 1. p . 391. Bigel. FI. Bost. ed. 2. p. 147. De
Cand. Prodr. v. 3. p. 40.
H ab. From Lake Huron (Dr. Todd) to north lat. 69°, (Dr. Richardson,') and from Newfoundland on
the east, (Sir Alex. Cochrane, Dr. Morrison,) to the shores of the Pacific, at the mouth of the Columbia,
(Douglas, Scouler.) Unalaschka and Bay of Eschscholtz. Chamisso.—Dr. Richardson says that the young
leaves, under the name of II Herbe Fret, are used by the Canadian voyagers as a pot-herb.
2. E. opacum, (Lehm.); caule erecto pubescente, foliis subsessilibus anguste lanceolatis
subintegerrimis opace venosis, floribus axillaribus solitariis pedunculatis, stylo reflexo glabro
staminibus breviore.
Medium fere inter E. angustifolium et latifolium, floribus capsulisque cum E. latifolio, foliis cum E. an-
gustfolio magis convenientibus. Coulis erectus 1-1£ pedalis, teres, laxus, pubescens, simplex, ramulis sterili-
bus in axillis foliorum. Folia subsessilia, sparsa, approximate, anguste lanceolata, acuminata, subintegerrima,
pellucido-punctata, opace nervoso-venosa, venis multo rarioribus quam in E. cingustifolio, supra saturate
viridia pilis brevissimis sublente conspicuis obducta, subtus pallidiora, glabriuscula. Folia ramulorum semper
opposita. Flores pauci, in axillis foliorum superiorum pedicellati. Calycis foliota lineari-lanceolata,
nervosa, tenuissime subciliata. Petala obovata, integerrima vel supeme erosa. Stylus reflexus, glaber, staminibus
adscendentibus brevior: stigmate 4-partito, revoluto. Germen incanum, pollicare. Capsulam
maturam non vidi.
Hab. Banks of the Columbia, North-West coast of America, particularly about Fort Vancouver. Douglas,
Dr. Scouler.
3. E. latifolium ; caule suberecto subramoso, foliis ovato-lanceolatis subintegerrimis
rigidis aveniis, floribus axillaribus pedicellatis, stylo suberecto glabro staminibus breviore.—
Linn. Sp. PI. v. 1. p. 494. FI. Dan. t. 565. Pursh, FI. Am. v. 1. p. 259. Rich, in Frankl.
lstf Journ. ed. 2. App. p. 12. De Cand. Prodr. v. 3. p. 40.—E. venustum. Douglas, MSS.
apud Herb. Hort. Soc. Lond.
H ab. Banks of rivers in the Rocky Mountains, between lat. 5 2 ° and 5 6 °, (Drummond, Douglas,) to the
shores and islands of the Arctic Sea, in every degree of longitude. Labrador. Dr. Morrison. Behring’s
Straits. Chamisso, Lay and Collie.—The figure given in the Flora Danica represents very exactly the North
American plant, which differs from the Siberian only in the less copious pubescence of its leaves. Amongst
the specimens sent by Mr. Douglas, there is one with the name of E. venustum, which, however, cannot be
separated from the above plant, the differences consisting only in the smaller size of all the parts. In
regard to its leaves, it is between E. latifolium «. and /3. Pursh.
S e c t . II. L y s im a c h io n . Petala obcordata, genitalia erecla.
4. E. alpinum ; caule basi repente bifariam pubescente paucifloro, foliis sessilibus oblongis
obtusis subintegerrimis, stigmate indiviso, capsulis sessilibus glabris.—Linn. Sp. PI. v. 1. p.
495. FI. Dan. t. 322. Engl. Bot. t. 2001. Pursh, FI. Am. v. 1. p. 260. Bigel. FI. Bost. ed.
2. p. 147. De Cand. Prodr. v. 3. p. 41.—13, nutans, caule majori apice nutante, foliis oblongis