Diplopappus.] COMPOSITiE. 



* Pappus conformis, utrinque setaceus. 



2\ 



1. Z). albus; foliis lineari-lanceolatis subiniegcrrimis scabris basi longe angustatis inferiori- 

 bus petiolatis, caule simplici corymboso scabro ramulis subunifloris sabaphyllis, involucri 

 foliolis oblongo-linearibus glabriusculis obtusis. — a. radiis albis. D. albus. Lindl MSS. 

 Chrysopsis alba. NntL Gen. Am, v. 2. p. 152. — Docllingeria? ptarnilcoides. Nees, Ast 

 p. 183.— /9. radiis luteis. D. lutescens. Lindl MSS. {in Herb. nostrJ) 



Hab. On the banks of the SaskatchaAvan; but rare. Br. Richardson. Drummond. — Lake Superior. Dr, 

 Pitcher y in Herb, Torrey.^oL. and^. Banks of the Red River, Douglas. — The outer pai>pus consists of very 

 few and indistinct hairs; the inner has the hairs by no means clavate at the extremity, and therefore it can- 

 not be a Doellingeria of Nees von Esenbeck. — Dr. Pitcher finds a single-flowered var. at Lake Superior. 



2. Z). canescens; pubescenti-canus, foliis lineari-lanceolatis integerrimis basi valde angus- 

 tatis inferioribus longe petiolatis, caule simplici corymbose, ramulis unifloris elongatis folio- 

 losis, involucri foliolis angustis acutissimis hirsuto-scabris, 



Hab. Between Carlton House and Edmonton House on the Saskatchawan. Di-ummond. — Perhaps a variety 

 of the following. 



3. D. grandijlorus ; canescens, caule subdecumbente infra basin ramoso, foliis lineari- 

 oblongis inferioribus spathulatis, ramis plerumque simplicibus unifloris nudiusculis involu- 

 cri foliolis angustis acutissimis birsuto-scabris. 



Hab. 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 ; suflFruticosus, ramis subcoi'ymbosis unifloris, foliis linearibus patenti- 

 bus scaberrimis serrulato-ciliatis, involucri foliolis sublaxe imbricatis lineari-lanceolatis obtusis. 



Diplostepbium linariifolium. Nees^ Ast p. 199. — Aster linariifolius* Linn. — Mich. Am. 

 V. 2. p. 110. Pursh^ PL Am. v. 2, p. 345, — Aster rigidus. Linn. — Mich. Am. v. 2. p. 110. 

 Pitrshy PL Am. v. 2. p, 544. Elliott^ Carol, v. 2. p. 365. 



Hab. Canada. Mrs. Sheppard. Newfoundland. Mr. Cormack. * 



5. Z>. incamis; totus incanus, foliis linearibus mollibus distantibus acutis mucronulatis, 

 ramis longis corymbosis monocephalis apice nudis, involucri ovati glandulosi foliolis lineari- 

 bus multiseriatis exterioribus squarrosis. Lindl. MSS. 



Hab. California and N.W. Coast of America. Douglas^ in Herb. Lindlep.—** D. rigido (linariifolio) 

 proxiraus. Caulis 2J 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 yery slender, an inch and a half long, almost filiform. Pappus white, exterior 

 ' very short; ovar^ hairy, 



7. Z). linearis; humilis, caulibus subcsespitosis erectissimplicibus apice nudiusculis unifloris, 



