﻿trans. Amer. phil. soc. 1. c. p. ill. 



Upper Missouri, Nuttall, Mr. Nicollet ! /?. Plains of the Platte towan 

 the Rocky Mountains, Nuttall! May-June— Stem 12-18 inches hig 

 Radical leaves 3-5 inches long, and 1-2 wide. Heads 6-20, rather Iarg( 

 the caiyculate bracts nearly equalling the involucre. 



15.^ S. hydropUlus ^ (Nutt.) :^ very ^glabrous ;^ stern simple, terete, st^riat 



others sessile, partly clasping; heads (small) numerous, in a comVun*^ ^^^^ 

 corymb; the pedicels and involucre scarcely bracteolate; scales of the cylii 



a. stem stout f the corymbs (not fufly developed) thyrsoid-paniculate.- 

 S. hydrophilus, Nutt. ! in trans. Amer. phil. soc. I. c. 

 13. stem slightly striate ; corymbs fasiigiate. 



Margin of ponds, Sec., in the Rocky Mountains along Ham's Fork of tt 

 Colorado of the West, Nuttall ' ^ Borders of a laki in the Wind R.v^ 

 Chain of the Rocky Mountains, Lieut. Fremont ! Aug.— About 2 feet hig 



scattered. Brac\eoles''few" and 'vefy mSme.— Heads sm"albr than in i 

 integerrimus. Achenia not striate. Receptacle alveolate. 



cent) ; stem tall, virgate, angled! simple or somewhat branched above, vei 

 leafy to the^summit; cauline leaves uniform (thin), lanceolate,^entire, mu 



terminal and from^^the ixfls u^ppe? leavesrpSicuEte*; the slend 



peduncles and pedicels and the small heads sparingly bracteolate ; bracteoli 

 filiform^-setaceous ; scales of the cylindrical 15-20-flowered involucre 8-1 



^ Along the North Fork of the Platte, Lieut. Fremont /—Stem 3 feet hig 

 slender, inclined to branch from the axils of the upper leaves, terminated t 

 a narrow corymbose panicle. Lower cauline leaves wanting; the upp 

 much longer than the internodes, 4-5 inches long, one-half to three-fourti 



17. S. ampullaceus (Hook.): very glabrous; stem grooved, branched 

 bove ; leaves fleshy, oblong, obtuse, entire or denticulate, partly clasping by 



cordate base ; the lowest spatulate ; panicle corymbose ; the peduncles m 

 ™ew""^^ ijicrassated and turbinate at the base of the^heads ; '^^^^}^"^J^lx, 

 irigose-canescent.— Hoo^. hot° mag^^JlAQT LK^^pro^r. 6. p. 428. _ 



Texas, Dmmmond !-P\an\. 2-3 feet high. Involucre at first cylindrical. 



