15. E. ? hyssopifolius; cauleramis sterilibus paniculato paucis in pedunculos nudos uni-
floros protractis, foliis linearibus integris glabellis ciliatis, radiis involucro cylindraceo multo
longioribus. Mich. Am. v. 2. p. 123. Pursh, FI Am. v. 2. p. 534?
H ab. Hudson’s Bay and near Lake Mistassins. Michaux.—With this I am unacquainted. In some of its
characters, it comes near my E. lonchophytttis, but the involucre is said to be cylindrical, and the rays much
longer than it Pursh refers it to DiU. Elth. t. 806, f 394, (E. Carolinianus, Willd.) evidently no true
Erigeron, the Phalacroloma of Cassini.
16. E. Canadensis; caule hispido, foliis lanceolato-linearibus ciliatis acutis, floribus (parvis)
in paniculam terminalem oblongam foliosam dispositis, ramis quasi racemoso-multifloris,
pedicellis foliolosis, radiis m inutis (albis) pappo copiosovix longioribus.— Linn.—Mich. Am.
v. 2.p. 123. Pursh, FI. Am. v. 2. p. 534.
Hab. Thoughout Canada. From Lake Huron to the Saskatchewan. Columbia River. Dr. Scouler.
17. E. ?fiorifer; caule breviusculo ramoso piloso, foliis omnibus lineari-spathulatis pilosius-
culis integerrimis glaucis, ramis pedunculiformibus unifloris (floribus inter maximos), involu-
cri foliolis exterioribus pubescenti-hirsutis interioribus membranaceis fimbriato-ciliatis, radiis
latiusculis (albis?) patentibus involucro duplo longioribus, pappi pilis albissimis incrassatis
hirsutulis.
Hab. Dry rocks and sandy grounds near Priest’s Rapids of the Columbia, and Lewis and Clarke’s River;
N.W. coast of America. Douglas.—This is evidently no Erigeron, yet it has as little affinity with any Aster.
The hairs of the pappus are unusually thick and white.
(Pappus duplex.\extusperbrevis subpaleaceus.)
18. E. annuus; foliis radicalibus subrotundo-ovatis profunde dentatis petiolatis, caulinis
lanceolatis acutis medio subserratis, corymbo terminali.—Aster annuus. Linn.—Erigeron
heterophyllus. Willd. Sp. PL v. 3. p. 1956. Pursh, FI. Am. v. 2. p. 534.—Diplopappus
dubius. Cass. Bull.—Stenactis dubia. Cass, in Diet, des Sc. Nat. v. 37. p. 485.—S. annuus.
Nees, Ast. p. 273.
Hab. Canada. Cleghom.—Except in the pappus, this is so entirely an Erigeron that I am very unwilling to
separate it from that Genus. The outer pappus consists of several very minute acuminated paleaceous scales.
It has, like the E. Canadensis, been introduced from America into Europe, and thus found a place in our
European Floras.
60. DIPLOPAPPUS.* Cass.
Radius uniserialis $. Discus £ . Pappus biserialis. Cor. disci regularis. Achenium
erostre.— Herbae vel fruticuli Americani, Asiatici vel Africani; foliis alternis, integris; capi-
tulis terminalibus solitariis, colore varie tinctis. Less.
* I follow my own inclination, no less than the valued suggestion of Professor Lindley, in uniting Diplostephium,
Kunth, and Doellingeria, Nees, with Diplopappus.
* Pappus conformis, utrinque setaceus.
1. D . albus; foliis lineari-lanceolatis subintegerrimis scabris basi longe angustatis inferiori-
bus petiolatis, caule simplici corymboso scabro ramulis subunifloris subaphyllis, involucri
foliolis oblongo-linearibus glabriusculis obtusis.—a. radiis albis. D. albus. Lindl. MSS.—
Chrysopsis alba. Nutt. Gen. Am. v. 2. p. 152.—Doellingeria? ptarmicoides. Nees, Ast.
p. 183.— j3. radiis luteis. D. lutescens. Lindl. MSS. (in Herb, nostr.)
Hab. On the banks of the Saskatchawan; but rare. Dr. Richardson. Drummond.—Lake Superior. Dr.
Pitcher, in Herb. Torrey.—«. and/3. Banks of the Red River. Douglas.—The outer pappus consists of very
few and indistinct hairs; the inner has the hairs by no means clavate at the extremity, and therefore it cannot
be a Doellingeria of Nees von Esenbeck.—Dr. Pitcher finds a single-flowered var. at Lake Superior.
2. D . canescens ; pubescenti-canus, foliis lineari-lanceolatis integerrimis basi valde angus-
tatis inferioribus longe petiolatis, caule simplici corymboso, ramulis unifloris elongatis folio-,
losis, involucri foliolis angustis acutissimis hirsuto-scabris.
Hab. Between Carlton House and Edmonton House on the Saskatchawan. Drummond.—Perhaps a variety
of the following.
3. D . grandiflorus; canescens, caule subdecumbente infra basin ramoso, foliis lineari-
oblongis inferioribus spathulatis, ramis plerumque simplicibus unifloris nudiusculis involucri
foliolis angustis acutissimis hirsuto-scabris.
H ab. Plains of the Saskatchawan and Prairies of the Rocky Mountains. Drummond.—This is nearly
allied to the preceding, but the flowers are twice as large, the plant is of more humble and less erect
growth, and the ramification is different, less corymbose.
4. D . linariifolius; suffruticosus, ramis subcorymbosis unifloris, foliis linearibus patentibus
scaberrimis serrulato-ciliatis, involucri foliolis sublaxe imbricatis lineari-lanceolatis obtusis.
__Diplostephium linariifolium. Nees, Ast. p. 199.—Aster linariifolius. Linn.—Mich. Am.
v. 2. p. 110. Pursh, FI. Am. v. 2. p. 545.—Aster rigidus. Linn.—Mich. Am. v.2 . p. 110.
Pursh, FI. Am. v. 2. p. 544. Elliott, Carol, v. 2. p. 365.
Hab. Canada. Mrs. Sheppard. Newfoundland. Mr. Cormack.
5. D. incams; totus incanus, foliis linearibus mollibus distantibus acutis mucronulatis,
ramis longis corymbosis monocephalis apice nudis, involucri ovati glandulosi foliolis linearibus
multiseriatis exterioribus squarrosis. Lindl. MSS.
H ab. California and N.W. Coast of America. Douglas, in Herb. Lindley.—“ D. rigido (linariifolio)
proximus. Caulis 2£ pedalis ab ima basi strictim racemosus, pube brevi mollis, foliis valde denudatus.
Radii amsene violacei.”—Lindl.
6. D.filifolius; incanus, foliis omnibus lineari-filiformibus, ramis longis subcorymbosis
unifloris, involucri foliolis imbricatis angustis acutis pubescenti-scabris, radiis flavescentibus,
pappo albo.
Hab. Common on the Great Falls of the Columbia and barren grounds of the interior. Douglas.—Ten
inches to a foot high. Leaves very slender, an inch and a halflong, almost filiform. P appus white, exterior
very short; ovary hairy.
7. D. linearis; humilis, caulibus subesespitosis erectissimplicibus apice nudiusculis unifloris,