352 



COMPOSITAE. 



Disk about 2" broad; leaves linear. 

 Disk 3" -6" broad; leaves lanceolate. 



Leaves narrowed at the base, sessile, not decurrent on the stem. 

 Involucre-bracts lanceolate, acute. 

 Involucre bracts spatulate, obtuse, or mucronate. 

 Stem leaves, and sometimes those of the branches decurrent, sagittate. 



[Vol.. III. 

 1. B. diffusa. 



2. B. asteroides. 



3. B. latisquatna. 



4. B. decurrens. 



i. Boltonia diffusa Ell. Paniclecl 

 Boltonia. (Fig. 3728.) 

 Boltonia diffusa Ell. Bot. S. C. & Ga. 2: 400. 1824. 



Paniculately much branched, 2-7 high, the 

 branches very slender or filiform. Leaves linear, or 

 the lower linear-lanceolate, acutish, the larger i/-2 / 

 long, i]4. ,/ -2 ,/ wide, those of the branches very small 

 and subulate; heads about 1" high; disk about 2 // 

 broad; rays usually white, i // -2 // long; involucre 

 broadly campanulate, its bracts oblong or oblong- 

 lanceolate, acutish or obtuse; achenes obovate, nar- 

 rowly winged; pappus of several short scales and 2 

 subulate bristles shorter than the achene. 



In dry soil, southern Illinois to Texas, east to South 

 Carolina and Florida. Aug.-Oct.J 



2. Boltonia asteroides (I,.) L/Her. 

 Aster-like Boltonia. (Fig. 3729.) 



Matricaria asteroides L. Mant. 116. 1767. 

 Mairicariag r laslifolia'H.i\\,Hort.'Kew. jg.pl.j. 1769. 

 Boltonia asteroides L'Her. Sert. Angl. 27. 1788. 



Rather stout, 2-8 high, somewhat cymosely 

 paniculate. Leaves lanceolate, to oblanceolate, 

 sessile, 2 / -5 / long, 3 // -i2 // wide, the upper linear- 

 lanceolate, smaller; heads 2 // -4 // high; disk 3 // -6 // 

 wide; rays white, pink or purple, 3 // -6 // long; invo- 

 lucre hemispheric, its bracts lanceolate or oblong- 

 lanceolate, acute or acuminate; pappus of setose 

 scales, with or without 2-4 slender bristles nearly 

 as long as the obovate or oval achene. 



In moist soil, New Jersey to Florida, west to Min- 

 nesota, Nebraska and Louisiana. July- Sept. 



3. Boltonia latisquama A. Gray. 

 Broad-scaled Boltonia. (Fig. 3730.) 



Boltonia latisquama A. Gray, Am. Journ. Sci. (II) 

 33-. 238. 1862. 



Similar to the preceding species and perhaps 

 a variety or form of it. Leaves lanceolate, acute, 

 sessile; heads rather larger; rays blue-violet ; 

 bracts of the involucre oblong- spatulate, obtuse 

 or mucronate; pappus of numerous small short 

 broad scales and 2 long bristles. 



Western Missouri, eastern Kansas and Arkansas. 

 Autumn. 



