230 THE FLORA. 
d Stem leaves clasping, with a cordate or anricled base,...¢€ 
d Stem leaves sessile, rarely clasping, never cordate or auricled....19 
e Involuero scales close, in several rows, outer ones gradually shorter....8, 9 
e Involucre scales loose, nearly equal, outer ones often wholly green....10-12 
f Leaves lanceolate and linear-lanceolate, more or less rough....18-15 
f Leaves linear, fleshy, very smooth, entire. Salt-marsh herbs....16-18 
1 A. corymbo’sus. Corymbed S. Slender, with thin, serrate leaves, 
2 A. macrophyl/lus. Big-lod. 8. Stout, with large, thick, ser., rough lvs. 18-rayed, 
8 A. cordifo/lius. Heart-leaved S. Involucre scales close, obtuse. Lvs. sharp-scrrate, 
4 A, sagittifo/lius. Arrow-leaved 8. Scales awl-shaped, long, loose. Lys. blunt-serrate. 
5 A, azu’reus. Azure S. Stem leaves sessile, rough, lanceolate, and linear. 
6 A. undula’tus, Stem lvs. on winged stalks, with rounded clasping bases, wavy. 
7 A. Shor’tii. Short’s S. Stem leaves on naked stalks, all cordate, pointed, entire. 
8 A.patens, Patent S. Plant rough-downy. Leaves entire. Scales pointed. 
9 A.levis. Polished S. Plant smooth and glaucous. Scales broad, acute. 
10 A. prenanthoi’des, Lvs. sharply cut-serrate, with a long, slender, entire base. 
11 A. punic’eus. Aed-st. S. Lvs. sparingly serrate, lance. Stem hairy, often red. 
12 A. Nove-Anglie, Mew-Hngland S. Leaves entire, rough, numerous. Rays 
nearly 100, 3’ long. Stems 4-6f. high. A fine species, often cultivated. 
18 A, acumina’tus. Del] S. Leaves coarsely-toothed, broad-lanceolate, long-pointed, 
often clustered, Rays white. In dark woods. N. 
14 A. nemora’sis, Wood S. Leaves narrow-lanceolate, nearly entire, acute, with 
edges revolute. Heads 1-8. In damp woods. N. M. 
15 A, ptarmicoi’des. Sneezewort S. Leaves entire, stiff, acute. Heads corymbed. 
16 A, flexuo’sus, Zigzag S. Heads large, with showy rays. Stem flexuous. 
17 A, linifo/lius, Flax §. Heads numerous, with very short rays in 2 rows. 
18 A. subula’tus, Heads with showy blue rays. Scales in 2 or 8 rows. S. 
19 May species, very variable, here omitted. (See p. 420, Class Book.) 
6. ERIG'ERON. Fleabane. Whiteweed. 
Heads many-flowered, mostly hemispherical, rays very numerous 
(20-200), narrow, linear, pistillate; disk flowers perfect. Receptacle flat, 
naked (no chaff or pits). Scales of the involucre nearly equal and in one 
row. Pappus generally simple-—Herbs with alternate leaves. Rays 
white, blue, or reddish. Flowering from May to September. 
* Rays showy, longer than the involucre, Heads large (+-1’ broad)....a 
= Rays obscure, shorter than the involucre, whitish. Heads very small....1, 2 
a Rays purple, very numerous. Heads loosely corymbed....3-5 
a Rays white or whitish. Heads loosely panicled....6-8 
1 E. Canaden’se, Canada F. Erect, hairy. Leaves lanceolate. Heads panicled. 
2 HB, divarica’tum, Prostrate F. Low, diffuse. Lvs. linear. Heads corymbed. W. 
