44 



COMPOSITAE. 



Disk about 2" broad ; leaves linear. 



Disk 3"-6" broad ; leaves lanceolate to oblanceolate. 



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. 1 1 1. 

 i. B. diffusa. 



2. B. asteroides. 



3. B. latisquama. 



4. B. decurrens. 



i. Boltonia diffusa Ell. Panicled Boltonia. 

 Fig- 4275- 



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, ii"-2" 

 wide, those of the branches very small and subulate: 

 heads about 2" 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, narrowly winged ; pappus of several 

 short scales and 2 subulate bristles shorter than the 

 achene. 



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

 lina and Florida. Aug.-Oct. 



2. Boltonia asteroides (L.) L'Her. Aster- 

 like Boltonia. Fig. 4276. 



Matricaria asteroides L. Mant. 116. 1767. 

 Matricaria glastifolia Hill, Hort. Kew. 19: pi. 3. 1769. 

 Boltonia glastifolia L'Her. Sert. Angl. 16. 1788. 

 Boltonia asteroides L'Her. Sert. Angl. 16. 1788. 



Rather stout, 2-8 high, somewhat cymosely 

 paniculate. Leaves lanceolate, to oblanceolate, ses- 

 sile, 2'-s' long, 3"-i2" wide, the upper linear-lanceo- 

 late, smaller; heads 2"~4" high; disk 3 "-6" wide; 

 rays white, pink or purple, 3"-6" long ; involucre 

 hemispheric, its bracts lanceolate or oblong-lanceo- 

 late, 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, Connecticut to Florida, west to Minne- 

 sota, Nebraska and Louisiana. July-Sept. 



3. Boltonia latisquama A. Gray. Broad- 

 scaled Boltonia. Fig. 4277. 



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

 33: 238. 1862. 



Similar to the preceding species and perhaps a 

 race of it. Leaves lanceolate, acute, sessile; heads 

 rather larger; rays violet-blue; bracts of the in- 

 volucre oblong-spatulate, obtuse or mucronate; 

 pappus of numerous small short broad scales and 

 2 long bristles. 



Western Missouri, Kansas, Arkansas and Okla- 

 homa. Autumn. 



