226 THE FLORA. 



25 S. Canzden'sis. Canada 0. Leaves pointed, rough. Panicle broad, c. 



26 S. Short'ii. STiores G. Leaves acute, very smooth. Panicle long, narrow. W. 



27 's.-pilo'sa. Saiiy S. Hairy, 4r-7f. high. Leaves remotely serrnlate. N.-J. S. 



28 S. odo'ra. Sunet S. Stem downy in lines, slender, 2-8f. high. Leaves very en- 



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



29 S. tortifo'lia. Twut-U). S. Stem rough. Lvs. often twisted, not punctate. S. 



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



81 S.'DToiamon'dii. BrummoncPsS. Stem l-2f. Lvs. velvety. Scales obtuse. W. 



S2 S. rad'nla. Hasp-lv. S. Stem rough-downy. Lvs. oblong-spatulate. W. 

 88 S. ulmifo'lia. Mm iS. Branohlets hairy. Scales acute. Eays 3 or 4, disk flow- 

 ers 8 or i. N. W. 

 84 S. Boot'ii. BootPs S. Branchlets hairy. Scales obtuse. Eays 2-5, disk flowers 



8-12. «. 

 35 S. linoi'des. Flax S. Smooth all over. Scales obtuse. Eays 1-4. 12-20'. N. 



36 S. Muhlenber'gii. Muhlenberg'' s S. Lvs. large, thin, notched, smooth both 

 sides. Heads 15-flawered. N. 



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

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



38 S. ellip'tioa. Mars/i S. Very leafy. Lvs. elliptic. Panicle dense, pyramidal. 



39 S. argu'ta. Saw-bi. S. Leaves few, elliptic, sharply serrate. Panicle spreading. 



40 S. neglec'fa. Neglected S. Leaves few, serrate, lin. -lanceolate. Panicle narrow. 



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



42 S. Hiddel'Ui. SiddelVsS. Branches, &o., dust-downy. Lvs. acute, concave. 



Heads corymbed. W. 



43 S. corymbo'sa, Corymbed S. Branches corymbed, hirsute. Outer secund. 



44 S. Houghto'nii. Houghton^ sS. Hds. few, very large. Otherwise like No. 41. N.-W. 



45 S. rig'ida. SUff S. L vs. rigid. Heads very large. Scales obtuse. Height 8-5f. 



46 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. Eays 



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



48 S. tenuifo'lia, Lmear-h). S. Leaves narrow-linear, one-veined. Eays short, 



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



2. HELIAN'THUS. 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 y, rough. Leaves opposite, the 

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

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

 Oet. (Figs. 498, &o.) 



