COMPOSITE. (COMPOSITE FAMILY.) 
219 
ovate, 3 - 5-lobed or angled, petioled ; rays few, oborate or wedge- 
form, shorter than the involucre, whitish-yellow. —Moist shaded ra¬ 
vines, W. New York to Wisconsin. July. 
2. P. Uvctliilia, L. (Large Polymnia. Leaf-cup.) RougA- 
ish hairy, stout (4°-10° high); leaves broadly ovate, angled and 
toothed, nearly sessile; the lower palmately lobed, abrupt y narrow 
ed into a winged petiole ; outer involucral scales very large ; rays 
15, linear-oblong, much longer than the inner scales of the involucre, 
yellow. - Ricli soil, W. New York and Penn., southward. Aug. 
26. SILiPIIIUMr L. Rosin-plant. 
Heads many-flowered ; the rays numerous, pistillate and fertile, 
their broad flat ovaries imbricated in 2 or 3 rows : the disk-flowers 
perfect, but sterile. Scales of the broad and flattish involucre im¬ 
bricated in several rows, broad and with loose leaf-like summits, 
except the innermost, which are small and resemble the ln ® a ^ 
chaff of the flat receptacle. Achenia broad and flattened (P ara e 
with the scales of the involucre), surrounded by a w ing w ic 
notched at the top, destitute of pappus, or with 2 teeth con uent 
with the winged margin : achenia of the disk sterile and sta 1 e 
— Coarse and tall rough perennial herbs, with a copious xesino 
juice, and large corymbose-panicled yellow-flowered hea s. 
<f>tou, the ancient name of a plant which produced some gum 
(assafoetida “?), was transferred by Linnaeus to this m 
genus.) 
* Stem terete , naked above , alternate-leaved near the a 
1. S. laciniatum, L. (Ros.n-weeo.) Very 
throughout / stem stout; leaves pinnately parte , pe io e acU te 
and clasping at the base; their divisions lanceolate or ; 
cut-lob,J or pinnatifid, rarely entire; heads few (large),*;omewhat 
racemed; scales of the involucre ovate, tapering into on _ 
ing rigid points; achenia broadly winged an eep y _ %oot 
Prairies, Michigan and Wisconsin, thence soul war . leaves 
very thick, s£m high ; heads 1' - 2- broad. 
12'-30' long, ovate in outline, said to presen oil Comvass- 
north and south (which is not the case), and hence c 
plant . c 
2 S. terebintlftiiiaceiiiYi, L. (Pbairi* Burdoc* ) 
smooth , tall, panicled at the summit and bearing man gome- 
leafless except next the base; leaves orate ^.ovate-oblong,^ 
what heart-shaped, serrate-toothed, rough, especial , winged, 
of the involucre roundish, obtuse, smooth; ac enta n 
