Gaiatella.] COMPOSITE. 



15 



Hab. Columbia River, Dr. Scouler. Abundaat on undulating, dry, gravelly soils near Fort Vancouver 

 and low hills of the interior. Douglas. —The leaves are remarkably acute, almost mucronate, and they 

 and the stems are quite rough with minute elevated dots. " S. conyzoidi proximus." LindL To me this 

 species, though very distinct, appears to approach nearest to S. tortifolius, 



56. TRIPOLIUM. Dod. Nees, 



Radius fmnineus fertilis. Involucri foliola interiora ainpliora membranacea, colorata, ap- 

 pressa, exteriora in pednnculi foliola decrescentia. Achenia cuneifonnia, conipressa, gla- 

 briuscula. Pappus simplex, capillaris, densus, noduloso-scaber, Receptaculwn alveolatam. 



Herbse annu(B vei perennes, glabrae, in solo salsuginoso crescentes. Folia anyusta, succu- 

 lenta, margine scBpe scabra, tripliiiervia vel subavenia. Flores corymbosi albi vel cmruleL In- 



volncra smpe color ata.Species Europce, Asim Caucasicm, Americw septentrionali indigent. 



Nees. 



I. T. pauciflorum ; foliis linearibus subcarnosis glabris caulinis snbnlatis amploxicaulibus, 



caule paucifloro (3~6-floro) raiiiis subunifloris viscido-pubescentibus, involucri hemis- 



phaericifoliolissuba^qualibus acutis. Nees, Ast p, 157.— Aster pauciflor us. NutL Gen. Am. 

 V. 2. p. 154. 



Hab. Marshes of the Saskatchawan. Drummond, 



2. T.angustuni {LindL); fuliis linearibus serrulato-scabris glabris, caule angusto strictissi- 

 mo, ramis rectis racemosis, involucri hcniisphujrici imbricati foliolis linearibus acutis, radio 

 inconspicuo.— a. ramis oligocephalis.— /S. ramis polycephalis.— Z/wt//, MSS. 



Hab. «. Banks of the Saskatchawan. Drummond.—/5. Slave Lake. Dr. Richardson.—" This species 

 differs essentially from T. subulatum, Nees (Aster subulatus, Mich.) in its stem not being ilexuose, in its 

 serrulated leaves, in the form of the leaflets of the involucre, and in the flowers being twice as large." 

 LindL 



57. GALATELLA. Cass. 



Radiusfcemineus stcrilis. Involucri angusti foliola inibricata angustn, nervo lierbaceo sub 

 apice non expanso. Achenia conoidea, dense liirsuta vel sericea. Pappus rigidulus, densus, 

 scaber. Receptaculum lacero-alveolatum. — Folia couformia angusta;vii{i\cs\m minora, sessiiia, 



subverticaliGi nervosa vel enervia solaque casta media, venis autem nullis divisa, rigidula sea- 

 bra plerisque punctata, punctis in superjicie stiperiori prcesertim obviis insculptis glandu- 

 laque granuliformi nitidula viridi fundo foveolm immersa prceditis, qtice glandules, in aliis 

 magis in aliis minus conspicucB, nonnullis omnino deesse videntur, caulis inferne simplex. 



apice distincte corymbosus, ramis dichotomis, rarius subtrichotomis. Radii ligulce distanfes, 

 neutrcB. Nees. 



1. G. nemoralis; foliis lanceolato-lincuribus integerrimis enervibus impunctatis scabris, 

 caule apice corymboso, radio elongate. Nees, Ast. p. 173. — Aster nemoralis. Ait. Ilort, 

 Kew, ed. 1. v, 3. p. 198. — A. ledifolius. Pursh, FL Am. v. 2. p. 544. — !3. uniflorus. — Aster 

 uniflorus. Mich. Am. v. 2. p. 110. 



Hab. Canada. Pursh. Kewfoundland. Mr, Cormack. Dr. Morrison. 



2. G. graminifolia ; foliis angusto-Iinearibussubtrinervibus margine costaque pilosiusculis 

 impunctatis, ramis terminalibusgracilibus subapliyllis unifloris, involucri foliolis laxls discum 



