Genus 31.] 



THISTLE FAMILY. 



375 



52. Aster Nebraskensis Britton. 

 Nebraska Aster. (Fig. 3786.) 



Stem strictly erect, slender, stiff, rough to the 

 base, simple, or with a few short nearly erect 

 branches, very leafy, \%-2 l / 4 tall. Leaves 

 thick, rather rigid, ascending, lanceoJate to ob- 

 loug-lanceolate, sessile by a subcordate base, 

 acute or acuminate at the apex, l / -3 / long, 

 4 // -6 // wide; very rough on both sides, the mid- 

 vein prominent beueath, the lateral veins ob- 

 scure; heads few, terminating short leafy 

 branchlets, \'-\% f broad; involucre broadly 

 campanulate or hemispheric, about 3" high, its 

 bracts green, oblong, acute, imbricated in sev- 

 eral series, the outer quite foliaceous; rays pur- 

 ple, about 6" long. ] 



Lake shores, central Nebraska. Sept. Lower 

 and basal leaves not seen. Type, Rydberg, No. 

 1 724, 1893, " in the lake region of Grant Co. , 2 miles 

 northwest of Whitman." 



53. Aster paludosus Ait. Southern Swamp Aster. (Fig. 3787.) 



Aster palitdosus Ait. Hort. Kew. 3: 201. 1789. 

 Heleaslru?n paludosum DC. Prodr. 5: 264. 



1836. 



Stem roughish, or rough-pubescent, 

 slender, simple, or somewhat branched 

 above, i~2}4 high. Leaves linear, en- 

 tire, glabrous, the margins rough or ciliate, 

 rather rigid, 2 / -6 / long, 2 // -4 // wide, mostly 

 i-nerved, acute, the lower part commonly 

 sheathing the stem; heads few or several, 

 racemose or paniculate, i^ / -2 / broad; in- 

 volucre broadly campanulate or hemis- 

 pheric, its bracts imbricated in about 5 

 series, foliaceous, ciliate, the outer lanceo- 

 late, acute, the inner oblong or spatulate; 

 rays 20-30, deep violet, 5 // ~7 // long, pap- 

 pus tawny; achenes S-10-nerved, glabrous 

 or nearly so. 



In swamps, Missouri to Texas, east to North 

 Carolina and Florida. Aug.-Oct. 



Bog 



54. Aster nemoralis Ait. 

 Aster. (Fig. 3788.) 



Aster nemoralis Ait. Hort. Kew. 3: 198. 1789. 



Stem puberulent, slender, simple, or corym- 

 bosely branched above, 6 / -2 high. Leaves 

 sessile, membranous, oblong-lanceolate or 

 linear-oblong, acute at each end, pubescent 

 or puberulent on both sides, dentate or entire, 

 i / -2 / long, \%"-\" wide, margins often revo- 

 lute; heads several, or solitary, i'-i^' broad, 

 the peduncles slender; involucre hemispheric, 

 its bracts appressed, linear-subulate, acute or 

 acuminate, imbricated in about 3 series; rays 

 15-25, light violet-purple to rose-pink; achenes 

 glandular-pubescent; pappus white. 



In sandy bogs, New Jersey to northern New 

 York, Ontario, Newfoundland and Hudson Bay. 

 Aug.-Sept. 



Aster nemoralis Blakei Porter, Bull. Torr. Club, 21: 

 311. 1894. 



Stems i-2% high, ascending, leafy from the base; leaves 2"-$%' long, s"-i' wide, oblong-lan- 

 ceolate, remotely and sharply dentate, or nearly entire; heads rather few, sometimes solitary. 

 Maine, New Hampshire and northern New York. Forms resemble the following species. 



