256 



SYNOENESIA ^QUALIS. 



niculatis, foliis radica- ! late; leaves of the root 

 libussubruncinatisjcau- slightly runcinate, of 

 linis ovatis, acumina- | the stem ovate, acumi- 



tis, 



denticulatis. 



petiolatis, medio i 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, ovatej 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 m a loose terminal panicle, peduncles bearing a 

 few ovate, ciliate, scales. Involucruni imbricate. Florets about fifteen. 

 Corolla purple. 



This plant is probably, as suggested by Wjlldenow the Lactuca Villosa of 



unlike 



of our other species of Lactuca. 

 Grows in shady rich soils. 



Flowers August — September* 



PRENANTHES. Gen. Pl. 1236. 



Invjolucrum 



basi 



Involucruni 



imbricatiim, Flosculi cate at base. 



serie simplici. Pappus in a 



simple 



i mb ri- 



Florets 



series. 



simplex, subsessilis. Pappus simple, nearly 

 Receptaculiim nudum, sessile. * fteceptcick 



naked. 



1. Altissiiwa. 



Lin. 



P. caule ramoso; fo- 



Stem 



branching; 



liis trilobis, petiolatis, 1 leaves 3-Iobed, petio- 

 angulatis, denticulatis, I late, angled, denticu 



margine scabrisj race 



late, 



scabrous alon_g 



mis axillaribus; flori- 1 the margin; racemes 



bus nutantibus 

 lucris sub 5-floris. 



• 



? 



mvo- 



flowers no 



axillary 



ding; mvolucrum 



erally 5.flowered. 



d 



en 



Sp. pl. 3. p. I53r. Pursh, %. p. 4S>8. 



