GENUS I00. THISTLE FAMILY. 537 
2. Mesadenia atriplicifolia (L.) Raf. Pale Indian Plantain. Fig. 4607. 
Cacalia atriplicifolia L. Sp. Pl. 835. 1753. 
Senecio atriplicifolius Hook. Fl. Bor. Am. 1: 
332. 1833. 
eee atriplicifolia Raf. New Fl. 4: 79. 
1836. 
Stem terete, glabrous and glaucous, 
3°-6° high. Leaves thin, angulate-lobed, 
palmately veined, glaucous beneath, the 
lower and basal ones slender-petioled, 
sometimes 6’ wide, the upper reniform, 
fan-shaped, or triangular with a nearly 
truncate base, the uppermost commonly 
small, lanceolate or oblong and entire; 
heads very numerous, about 12” broad, 
in large, loose compound corymbs; invo- 
lucre 3’-4” high, its bracts linear-oblong, 
scarious-margined, with or without 1-3 
minute outer ones. 
In woods, New Jersey to Indiana, Minne- 
sota, south to Florida, Tennessee, Missovri 
and Kansas. Recorded from Ontario. Called 
also wild caraway. July—Sept. 
Gf 3. Mesadenia tuberdsa ( Nutt.) Britton. 
yj Tuberous Indian Plantain. Fig. 4608. 
Cacalia tuberosa Nutt. Gen. 2: 138. 1818. 
Mesadenia plantaginea Raf. New Fl. 4: 79. 1836. 
Senecio Nuttallii Sch. Bip. Flora 27: 499. 1845. 
M. tuberosa Britton in Britt. & Brown, Ill. Fl. 3: 
474. 1898. 
Glabrous and green throughout; stem angled, 
stout, 2°-6° high. Leaves thick, strongly 5-0- 
nerved, the lower and basal ones oval, ovate, 
or ovate-lanceolate, obtuse or acutish, usually 
quite entire, but sometimes repand, long-peti- 
oled, narrowed at the base, or rarely subcordate, 
4-8’ long, 1-3’ wide; upper leaves ovate to 
oblong or cuneate-obovate, sessile or short-peti- 
oled, much smaller, sometimes toothed toward 
+} the apex; heads very numerous in a compound 
corymb, about 2” broad, mostly 5-flowered; 
involucre 3’-4” high, its bracts linear-oblong, 
obtuse or obtusish, scarious-margined. 
On wet prairies and in marshes, Ohio and west- 
ern Ontario to Minnesota, Kansas, Alabama, Louisi- 
ana and Texas. June—-Aug. 
ror. SYNOSMA Raf.; Loud. Gard. Mag. 8: 247. 1832. 
A perennial leafy herb, glabrous or very nearly so, with triangular or hastate, alternate 
leaves, the lower petioled, the upper sessile, and several or numerous, corymbose or corym- 
bose-paniculate, discoid heads of white or pinkish flowers. Involucre nearly cylindric, its 
principal bracts 12-15, linear, acute, usually with some subulate outer ones. Receptacle flat, 
naked. Flowers perfect; corolla 5-lobed. Style-branches not appendaged. Pappus of very 
numerous white soft capillary bristles. [Greek, perhaps signifying a fragrant composite.] 
A monotypic genus of eastern North America. 
