180 Order CAMPANULALES 
2. Townsendia exscapa (Richards) Porter. 
In dry soil in the western part of the state. Deuel county; Foster; 
Halsey; McCook; North Platte; Sidney. 
10. Boltonia. 945. 
1. Boltonia asteroides (L.) L’Her. False Aster. 
In low, wet places mostly in the eastern part of the state. Hast- 
ings; Kearney; Lincoln; Loup City; Minden; Nebraska City; Weep- 
ing Water. 
11. Aster. 946. 
Basal, and sometimes also the cauline, leaves both cordate and 
petioled; no cordate-clasping leaves. 
Plants glandular; heads 10-12 mm, high. 1. A. macrophyllus. 
Plants not glandular; heads 5-10 mm. high. 
Leaves thick, usually all entire. 2. A. azureus. 
Leaves thinner, serrate. 
Involucre 4-6 mm. high; bracts obtuse. 3. A. cordifolius. 
Involucre 6-10 mm. high; bracts acute. 
Glabrous or nearly so; involucral bracts awn-pointed. 
4. A. sagittifolius. 
Pale with fine gray pubescence; bracts acute. 
5. A. drummondii. 
Leaves, if cordate, sessile or nearly so, some of them often cordate- 
clasping. 
Stems hirsute or hispid-pubescent. 
Leaves entire. 
Rays 40-50, 10-15 mm. long. 6. A. nove-anglie. 
Rays 20-30, 6-10 mm. long. 7. A. oblongifolius. 
Leaves sharply serrate. 8. A. puniceus. 
Stems glabrous or slightly pubescent in streaks. 
Leaves densely silvery-white pubescent on both sides. 
13. A. sericeus. 
Leaves not silvery pubescent. 
Rays blue, violet or purple, rarely white. 
Stem leaves, at least the upper, cordate-clasping, lanceolate 
or oblanceolate. 
Outer bracts of the involucre shorter than the inner, not 
foliaceous. 9. A. levis. 
Outer bracts of the involucre as long as or longer than 
the inner, foliaceous. 12. A. phyllodes. 
Stem leaves, if clasping, linear or linear-lanceolate. 
Rays purple, about 12 mm. long. 15. A. nebraskensis. 
Rays white, violet or purplish, 6-10 mm. long. 
Leaves narrowly linear. 
Leaves with ciliate margins. 14. A. fendleri. 
Leaf-margins not ciliate. : 18. A. junceus. 
Leaves linear-lanceolate to oblanceolate. 
Heads few; leaves entire or nearly so. 
Involucral bracts in 3-5 series. 10. A. adscendens. 
Involucral bracts in 1-2 series. 11. A. longifolius. 
Heads numerous, leaves usually serrate. 
Disk 1 cm. wide; rays rarely white. 
16. A. salicifolius. 
Disk 6-8 mm. wide; rays generally white. 
17. A. paniculatus. 
