i66 SYNGENESIA. SUPERFLtA. 



late or tubular. Receptacle naked. Pappvss'un- 

 pie, sessile. (Flowers niosth polygamous, dioi- 

 cous.) 



Leaves radical, often large; scapes squamose, l-flowered, 

 or tliyrsoidly spiked, mosUy appearing- before the leaves. 



Sp£ciEs. l.'V . frigutu. '2.sagiUuta. Herb, Banks, mss. 

 3. palmata. r. v. On the islands of Lake Huron, near 

 IMictiilimakinnk, in Fir woods, f.-Jbies Cunadem-isJ). The 

 leaves considerably resemble those of PodophijUum pel- 

 tatian. 



A genus almost exclusively European, with the above, 

 2 species in Siberia and 1 in ratugonia, excepted. 



566. ZINNIA. L. 



Calix ovatc-c^lindric, imbricate. Bavs 5, 

 persistent, entire. Jleccptade paleaceous. Pap' 

 jms 2 erect awns. 



Herbaceous; leaves opposite, rarely verticillate; flowers 

 solitary, terrr.inal; rajs red or yellow. 



Species. 1. Z. muUiJlova. A doubtful native. 



A genus of 5 species, all probably indigenous to Mexi- 

 co, with the exception of Z. paudf.ora of Peru. 



567. BOEBERA. mildenow. 



Calix double, exterior many-leaved; interior 

 8-lcavcd. Bi'ccpiacle naked. Pappus ])ilose. 



Annual; lea\es opposite, pseudopin'nate, and as well as 

 the catix glandular; pcdui.cles 1-fiov/ered, dichotomal and 

 terminal. Iimer calix about 12-Ieaved, exterior or invo- 

 lucell about 8-Ieaved, .spreading. Uays about S. Pajjpiis 

 pilose, shoi't Nearly allied to Tugetes. 



Species. 1. B. c^-icinduhsa. A common weed on the 

 banks of tlie Missisippi and Missouri to the Mountains, in 

 denudated soiiK. — Stem decumbent and much branched. 

 Flowers small and ^ellovv-; calix campanulate, and as well 

 as the leaves, beset with the same fa-tid resinous glands 

 as 'J'L.getes and diffusing a similar Uutaceous odor. — The 

 only species of the genus. 



668. ^TRICHOPHYLLUM. t 



Calix oblong-cylindric, many-leaved, equal. 



fThe copious pubescence, particularly disting-uishinij tlicse 

 plants from the genus ^aje.'cj. 



