GENUS 31. 



THISTLE FAMILY. 



19. Aster Lowrieanus Porter. Lowrie's 

 or Fall Aster. Fig. 4300. 



Aster cordifolius var. laevigatus Porter, Bull. 



Torr. Club 16 : 67. 1889. Not A. laevigatus 



Lam. 1783. 

 Aster Lowrieanus Porter, Bull. Torr. Club 21 : 



121. 1894. 



Glabrous, or very nearly so throughout ; 

 stem branched, i-4 high. Leaves thickish, 

 firm, a little succulent, the basal slender-peti- 

 oled, ovate to ovate-lanceolate, mostly cordate, 

 acute or obtusish, serrate, or sometimes in- 

 cised, 2'-6' long, those of the stem ovate to 

 oblong, often cordate, contracted into winged 

 petioles, the uppermost lanceolate ; heads usu- 

 ally not very numerous, 2i"-3" high, loosely 

 panicled ; involucre turbinate, its bracts obtuse 

 or obtusish, appressed; rays light blue, 3"~4" 

 long, but variable in length. 



In woods, Connecticut and southern New York 

 to Pennsylvania, Ontario, North Carolina and 

 Kentucky. Races differ in leaf-form and serration. 

 Sept.-Oct. Bee-weed. Blue-devil. 



20. Aster Lindleyanus T. & G. Lindley's Aster. Fig. 4301. 



As er Lindleyanus T. & G. Fl. N. A. 2 : 122. 1841. 

 A. Wilsoni Rydb. Bull. Torr. Club 37: 138. 1910. 

 Aster Lindleyanus eximius Burgess; Britt. & Brown, 

 111. Fl. 3: 364. 1898. 



Stem usually stout, glabrous, or sometimes pu- 

 bescent, i-6 high, branched above. Leaves 

 rather thick, glabrous, or slightly pubescent, espe- 

 cially on the veins, the lower and basal ones cor- 

 date at the base, sharply serrate, ovate, acute or 

 acuminate, 2'-^' long, with slender naked peti- 

 oles ; upper leaves ovate, ovate-lanceolate, or lan- 

 ceolate, less serrate, or entire, sessile, or with 

 margined petioles, those of the branches lanceo- 

 late or linear-lanceolate, smaller; heads usually 

 not numerous, 4"-$" high; involucre broadly 

 turbinate or nearly hemispheric, its bracts linear- 

 lanceolate, acute, rather loosely imbricated, gla- 

 brous, or nearly so, their tips green; rays 10-20, 

 blue or violet, 3"-5" long; pappus nearly white. 



In open places, Labrador to Mackenzie, Alberta, 

 Maine, New York, Michigan and Montana. Aug.- 

 Oct. 



21. Aster Drummondii Lindl. Drummond's 

 Aster. Fig. 4302. 



Aster Drummondii Lindl. in Hook. Comp. Bot. Mag. I : 



97- 1835- 

 Aster hirtellus Lindl. in DC. Prodr. 5: 233. 1836. 



Stem usually stout, finely and densely canescent, 

 branched above, 2-s high. Leaves mostly thin, 

 ovate or ovate-lanceolate, acuminate, rough above, 

 canescent beneath, the lower and basal ones cordate, 

 with slender naked petioles, sharply toothed, 2'-^' 

 long, the upper cordate or rounded at the base, usu- 

 ally on margined petioles, those of the branches 

 sessile and entire or nearly so, much smaller; heads 

 3"-4" high, rather numerous on the racemose 

 branches ; involucre turbinate, its bracts linear, 

 slightly pubescent, acute or acuminate, their green 

 tips appressed; rays 8-15, blue, 3"~4" long; pappus 

 whitish. 



In dry soil, borders of woods and on prairies, Ohio 

 to Minnesota, Kentucky, Arkansas and Texas. Perhaps 

 not specifically distinct from the following. Sept.-Oct. 



