Genus 31. 



THISTLE FAMILY 



67. Aster parviceps ( Burgess ) Mackenzie & 

 Bush. Small-headed Aster. Fig. 4348. 



Aster ericoides parviceps Burgess; Britt. & Brown, 111. 

 Fl. 3:379. 189S. 



Aster parviceps Mackenzie & Bush, Fl. Jackson Co. 196. 

 1902. 



A. depauperatus parviceps Fernald, Rhodora 10 : 94. 

 1908. 



Pilose, sometimes slightly so, much branched above, 

 l-2i c high, the branches ascending. Basal leaves 

 spatulate; stem leaves linear to linear-lanceolate, 

 1' 3' long, often with short leafy branches in their 

 axils, those of the branches very small; heads many, 

 paniculate ; involucre about 2" high, turbinate, its 

 linear-subulate bracts imbricated in several series ; 

 rays 10-12, white, about 2" long. 



Dry prairies and open woodlands, Illinois, Iowa and 

 Missouri. Aug. -Sept. 



68. Aster depauperatus (Porter) Fernald. 

 Serpentine Aster. Fig. 4349. 



Aster ericoides pusillus A. Gray, Syn. Fl. i 2 : 184. 1884. 



Not A. pusillus Horn. 

 Aster ericoides depauperatus Porter, Mem. Torr. Club 



5: 323. 1894. 

 Aster depauperatus Fernald, Rhodora 10 : 94. 1908. 

 Aster parviceps pusillus Fernald, Rhodora 11 : 59. 1909. 



Glabrous, slender, widely branched, 4'-l5' high. 

 Basal leaves spatulate or oblanceolate, obtusish, i'-li' 

 long, narrowed into petioles ; stem leaves linear to 

 linear-subulate, 1' long or less, i"-l" wide, those of 

 the branches minute ; heads many, terminating short 

 branchlets ; involucre turbinate, about 2" high, its 

 bracts linear-subulate, acute, rays white, about 2" 

 long. 



On serpentine barrens, southern Pennsylvania and 

 West Virginia. Aug.-Oct. 



69. Aster paludosus Ait. Southern 

 Swamp Aster. Fig. 4350. 



Aster paludosus Ait. Hort. Kew. 3: 310. 1789. 



Heleastrum paludosum DC. Prodr. 5: 264. 1836. 



Stem roughish, or rough-pubescent, slen- 

 der, simple, or somewhat branched above, 

 l-2h high. Leaves linear, entire, glabrous, 

 but margins rough or ciliate, rigid, 2 -6' long, 

 z"-4" wide, mostly 1 -nerved, acute, the lower 

 part commonly sheathing the stem ; heads 

 few or several, racemose or paniculate, ii'-2' 

 broad ; involucre broadly campanulate or 

 hemispheric, its bracts imbricated in about 5 

 series, foliaceous, ciliate. the outer lanceolate, 

 acute, the inner oblong or spatulate; rays 

 20-30. deep violet, 5"-/ long, pappus tawny ; 

 achenes 8-10-nerved, glabrous, or nearly so. 



In swamps. Kansas and Missouri to Texas, east 

 to North Carolina and Florida. Aug.-Oct. 



