OHDEK 70. ASTERWORTS. 237 



25 S. Canaden'sis. Canada G. Leaves pointed, rough. Panicle broad, e. 



26 S. Short'u. Shot-fs G. Leaves acute, very smooth. Panicle long, narrow. W. 



27 S. pilo'sa. Hairy S. Hairy, 4-7f. high. Leaves remotely serrulate. N.-J. S. 



28 S. odo'ra. Sweet S. Stem downy in lines, slender, 2-3f. high. Leaves very en- 



tire, smooth, punctate with pellucid dots. Fragrant, c. 



29 S. lortifo'lia. Twist-lv.S. Stem rough. Lvs. often twisted, not punctate. S. 



80 S. altis'sima. Tall S. Stem hairy, 4-6f. Lvs. veiny, rough. Scales acute, c 



81 S. Drammon'dii. DrummoncCs S. Stem l-2f. Lvs. velvety. Scales obtuse. \\ 

 32 S. rad'ula. Rasp-lo. S. Stem rough-downy. Lvs. oblong-spatulate. \V. 



88 S. nlmifo'lia. Elm S. Branchlets hairy. Scales acute. Rays 3 or 4, disk flow- 

 ers 3 or 4. N. W. 



84 S. Boot'ii. Bootffg S. Branchlets bairy. Scales obtuse. Kays 2-5, disk flowers 



8-12. S. 



85 S. linoi'des. Flux S. Smooth all over. Scales obtuse. Kays 1-4. 12-20'. N, 



36 S. Muhlenber'gii. Muhl^nberg^s S. Lvs. large, thin, notched, smooth both 



sides. Heads 15-flowered. N. 



37 S. pat'ula. Spreading S. Lvs. large, thick, very rough on the upper side. 



Stem 2-4f, brandies leafy. Heads 20-flowered. N. 



B8 S. ellip'tica. Marsh, S. Very leafy. Lvs. elliptic. Panicle dense, pyramidal. 

 69 S. argu'ta. Saiv-lv. S. Leaves few, elliptic, sharply serrate. Panicle spreading, 

 iO S. neglec'ta. Kegltcted S. Leaves few, serrate, lin. -lanceolate. Panicle narrow. 



41 S. Ohien'sis. Ohio S. Smooth all over. Lvs. obtuse, flat. Corymbed. W. 



42 S. Riddel'lii. RiddeWs S. Branches, &c., dust-downy. Lvs. acute, concave. 



Heads corymbed. W. 



43 S. corymbo'sa. G/rymbed S. Branches corymbed, hirsute. Outer secund. 



44 S. Houghto'nii. llougkton 1 s S. Hds. few, very large. Otherwise like No. 41. N.-W. 



45 S. rig'ida. Stiff S. Lvs. rigid. Heads very large. Scales obtuse. Height 3-5f. 

 i6 S. Spithamae'a. Dwarf S. Leaves thin, sharp-serrate. Scales acute. Height 



6-12'. Mountains. S. 



47 S. lanceola'ta. Lance-lv. S. Leaves linear-lanceolate, 3-5-veined. Raya 



minute, about 17. Corymbs crowded, fragrant, c. 



48 S. tenuifo'lia. Linear-la. S. Leaves narrow-linear, one-veined. Kays short, 



about 10. More slender, with thinner clusters, c. 



2. HELIANTHUS. Sunflower. 



Heads many-flowered, rays neutral, disk-florets perfect Scales of the 

 involucre in several rows, more or less imbricated. Torus flat or convex, 

 the chaff persistent, embracing the 4-sided, flattened achenia. Pappus of 

 2 chaffy awns, deciduous. Herbs, mostly if, rough. Leaves opposite, the 

 upper often alternate, mostly 3-veined. Heads mostly large, the disk 

 from half an inch to If. broad. Rays yellow, disk yellow or purple. July- 

 Oct. (Figs. 498, <fec.) 



