1889.] BOTANICAL GAZETTE. I47 



C. gladiata Walt, and C. angustifoUa Ait. are two very 

 closely related species, and many intermediate forms are 

 very puzzling. The achenia do not give very reliable char- 

 acters, for they vary much even in the same head, and have 

 nothing very constant about them. Fig. 2, perhaps, repre- 

 sents a tvpical achenium of C. gladiata as considered by Gray 

 in Synopt. Fl., with its short awns and pectinate fringe. Fig. 

 3 is a good representation of C. angustifolia, with its narrow 

 fimbriate wings and slender setiform awns. Fig. 4 does not 

 look much like the last, but is from the same head near the 

 center. Fig. 5 represents the other extreme, with wing 

 broader than body. The achenia of these species are linear- 

 oblong to obovate-oblong, 1+-2 lines long, smooth or papillose- 

 roughened. Fig. 2 is from J. D. Smith's collection ot 1883, 

 near Columbia, S. C. Figs. 3 and 4 are from Dr. A. P. 

 Garber's S. Fla. collection, distributed as C. gladiata. Fig. 

 5 is from G. McCarthy's collection of the past season, near 



Augusta, Ga. 



C. integrifolia Poir. has been referred to this section, but 



has never been collected in fruit. 



** Achenia incurved, with scarious entire wings, minute awns (ex- 

 cept in C. Leavenworthii), smooth to tuberculate roughened. 



C. Leavenworthii Torr. & Gray. Achenia oval, 1 line 

 long ; wings as broad as bodv ; awns slender, prominent. 

 (Fig. 6.) 



Drawing from Curtiss 1480. , 



C. Alkinsoniana Dougl. Achenia oblong, 1 line long by 

 . -ine wide, smooth ; wings very narrow, often a mere mar- 

 gin ; pappus of two small teeth, or obsolete. (Fig. 7.) 



Drawing from Howell's collection. 



C. cardaminefolia Torr . &Gray. Achenia oval to oblong, 

 1 to U lines long, smooth or slightly papillose ; wings almost 

 as broad as bodv, sometimes almost as narrow as the pie- 

 cedincr- nanmia wanfinA or two verv small teeth, (rig. ».;• 



it's New Mexican collection of 185 1. 



*** Achenia minute (smallest of the genus), more or less incurved, 

 wingless, awnless, smooth or slightly papillose. 



C. tinctoria Nutt. Achenia linear to narrowly oblong, a 



line or less long, thinnish. (Fig. 9.) 



The achenia are much like the following, as shown by the 

 figure. Drawing from Wright's collection ot 1840. 



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