174 STNGENESIA. FRUSTRANEA. 



.florets minutely 5-toothed, viscid. Seed short and obco- 

 ric, shorter than the chaffy calicle. Pappus about 5 or 

 6-leaved, Rwned.f Receptacle hemispherical, naked. H ab. 

 On high gravelly hills near Fort Mandan, Missouri. Flow- 

 ering in June and July. 



Of this genus, which does not appear to have any natu- 

 ral affinity with HymenopappuSy there is a second species 

 indigenous to Buenos Ayres. 



Order III.— POLYGAMIA FRUSTRANEA. 



(Discal florets bisexual; rays neutral, sterile.) 



566. *^LEPT0P0DA4 



Calix simple, many-parted. Rays 20 or more, 

 semitrifid, broader at the summit. Receptaele 

 naked, hemispherical. Pappus paleaceous, 8 to' 

 10-leaved, awnless. 



Herbaceous; stem 1-flowered, peduncle very long; 

 leaves alternate, decurrent, very entire and smooth; flower 

 entirely yellow. 



L. Heknium. Galardia Jimbriata? Mich. Flor. 2. p. 142. 



Obs. Perennial. Very smooth. Stem attenuated, and 

 grooved, about 2 feel long. Peduncle 12 inches, a little 

 enlarged under the calix. Leaves few, linear-lanceolate, 

 entire and very smooth, decurrent, lower ones 6 to 8 

 inches long, attenuated downwards, slightly punctate and 

 thickish, only 3 or 4 lines broad, the uppermost sessile, 

 linear, and not more than 2 inches long. Calix short and 

 simple like that of Ilelenium, segments foliaceous and 



t The number of paleaceous leaflets crowning the seeds of 

 many syngenesious genera, will often be found to constitute 

 more essential generic distinctions, than many others which are 

 constantly adduced; in some genera these leaflets are about 5, in 

 a smaller number 6 to 8, or 8 to 10, and in others 12 to 15. Not- 

 withstanding their minuteness, tliey appear to hold the relative 

 importance of the divisions of the calix, in which number is 

 indisputably important. 



4 So called in allusion to tlie elongated peduncle. 



