256 
SYNGENESIA .E0ITAL15. 
niculatis, foliis radica- 
libussubruncinatis,eau- 
linis ovatis, acumina- 
tis, petiolatis, medio 
denticulatis. 
late; leaves of the root 
slightly runcinate, of 
the stem ovate, acumi- 
nate, petiolate, toothed 
in the middle. 
Sp. pi. 3. p. 1521. Pursh, 2. p. 502. Nutt. 2. p. 125. 
Stem three to four feet high. Lower leaves spathulate, ovate, acumi- 
nate, acutely toothed, sometimes angled, glabrous on the upper surface, 
pale and hairy underneath, attenuated at base, into a winged petiole, two to 
four inches long. Flowers in a loose terminal panicle, peduncles bearing a 
few ovate, ciliate, scales. Involucrum imbricate. Florets about fifteen. 
Corolla purple. 
This plant is probably, as suggested by Willdenow the Lactuca Villosa of 
.Tacquin, for the pappus is certainly stipitate and the habit not unlike that 
of our other species of Lactuca, 
Grows in shady rich soils. 
Flowers August — September. 
PRENANTHES. 
Involucrum basi 
imbricatum. Flosculi 
serie simplici. Pappus 
simplex, subsessilis. 
Receptaculum nudum. 
1. Actissima. Lin. 
P. caule ramoso; fo- 
liis trilobis, petiolatis, 
angulatis, denticulatis, 
margine scabris; race- 
mis axillaribus; flori- 
bus nutantibus; invo- 
lucris sub 5-floris. 
Gen. Pl. 1236. 
Involucrum imbri- 
cate at base. Florets 
in a simple series. 
Pappus simple, nearly 
sessile. Receptacle 
naked. 
Stem branching; 
leaves 3-lobed, petio- 
late, angled, denticu- 
late, scabrous along 
the margin; racemes 
axillary, flowers nod- 
ding; involucrum gen- 
erally 5 -flowered. 
Sp. pi. 3. p. 1537. Pursh, 2. p. 498. 
