OF ARTS AND SCIENCES. 211 



beak of the achenium is funnel-like or tubular ! Also, that Dr. 

 Palmer's plant from southern Utah appears to be of a second nearly- 

 related species. The diagnoses of the two may be expressed as fol- 

 lows : — 



G. MARGiNATA Eaton. Foliis insigniter scarioso-limbatis, summis 

 bracteisque (involucrum circiter 12-phyllum 15-18-florum ajquanti- 

 bus) lacinulis fere filiformibus pectinato-marginatis ; ligulis (an sem- 

 per ?) parvis ; acheniis cinerasceutibus, rostro infundibulari. — Nevada 

 Desert, on the borders of California. 



G. SETULOSA. Foliis margine parum callosis, dentibus superiorum 

 calloso-setiferis ; bracteis calyculatis involucro angusto 8-12-iloro 7-8- 

 phyllo dimidio brevioribus ; acheniis glabris, rostro usque ad basim 



producta. — Calais Lindleyi DC. 1. c. Uropappus heterocarpus Nutt. 1. c. ex char. 

 Tliis occurs, mixed with the succeeding, in various collections, with which 

 it has naturally been confounded, and it has sometimes been named Calais 

 Douglasii. 



15. M. LiNEARiFOLiA. FoHis junioribus nunc pubescentibus seu villosulo- 

 ciliatis ; acheniis plerisque rostrato-attenuatis ; pappi albi paleis achenio ssepius 

 brevioribus lineari-lanceolatis apice raox acute bifidis, costa tenui ex sinu in 

 aristam capillarem ipsa plus dimidio breviorem producta. — Calais Umarifolia 

 DC. 1. c. excl. syn. Uropappus linearifolius & tjrandijloriis Nutt. 1. c. 



16. M. MACROCH^TA. Fappi paleis oblongis arista sua tenuissima ex sinu 

 exserente achenioque rostrato-attenuato 2-3-plo brevioribus. — Calais macrochceta 

 Gray PI. Fendl. & in Bot. Whipp. 1. c. 



* * Pappi paleaj 20-24, angustissimae, in aristam scabridam sensim attenuatfe ! 



17. M. TROxiMOiDES. Troximo cuspidato similis, fere acaulis ; radice perenni 

 crasso nigricante ; foliis crassiusculis linearibus sursum attenuatis integerrimis 

 vel margine undulato ; scapo spithamreo ad pedalem foliis 1-2 parvulis nunc 

 instructo ; involucro cylindraceo vel subturbinato 20-30-floro e squamis lanceo- 

 latis sensim acuminatis subasqualibus ; pappo albido achenio lineari sursum 

 parum angustato longiore. — Two forms are known: one from hills on the 

 Clear Water River, Oregon (now Idaho Terr.), collected by Mr. Spalding, and 

 mistaken for Troximon cuspidatum, also Montana Territory, from an unknown 

 collector. This has a little pubescence about the head, unripe akenes rather 

 strongly 10-striate-ribbed, and hardly "apering upwards. The other is no. 600 

 in the collection distributed by Kellogg and Harford, probably from the ncrthem 

 part of the coast of California. The single specimen I have seen of this has a 

 wholly naked scape, a narrower and glabroub involucre, a whiter papi)us, the 

 achenia more lightly costate, and apparently more tapering upwards. This and 

 Troximon cuspidatum indicate a clear transition between the two rather widely 

 separated genera. The akenes of the present anomalous plant are about four 

 lines long, glabrous : the pappus half an inch long, of uniform awnllke paleae, 

 which are flat and about a quarter of a line long to near the middle, thence 

 gradually tapering into the slightly rigid and scabrous awn. Calyculate scales 

 of the involucre hardly any. 



