496 SYNGE^fESIA, 



phyllus, 3-dentatus. Cal. S-phyllus. S-em. caly- 

 culo 4-phyllo involuta. 



663. BALTIMORA. /?ece/)/. paleaceum. Pappus n\i\\ns. 



Flosc. radii 5. Cal. cylindricus, polyphyllus. Sein. 

 3-quetra. 



664. PARTHENIUM. Recept. paleaceum, planum. Pap- 



pus nullus. Cal. 5-phyllns. Sem. obovata. 



665. I VA, i?ece/3^ pilosnm. Pappus wuWus. Cor, radii 5. 



Antherce approximatse^ non coalitse. Styli 2. longi. 

 Cor. radii 5. femineis minimis. Ca/. 3- phyllus. 



666. AMBROSIA. Monoka. Masc. Recept. nudum. An- 



therce approximatae, non coalitse. Cal. l-phyllus, 

 hemisphaericus,. multiflorus. Fern. Cal. l-phyllus, 

 subinteger aut 5-dentatus, 1-florus. Cor. nulla. Sty- 

 li 2. Nux e calyce indurato, 1-sperma. 



667. XANTHIUM. Monoicum. Alasc. Recept. paleace- 



um. Antherce approximatae, non coalitae. Cat po- 

 lyphyllus, imbricatus, hemisphaericus, multiflorus. 

 Fern. Cal. involucrum 2-phyllum, 2-florum. Cor. 0. 

 Sligm. 2. Drupa sicca, muricata, 2-lida. Nucleus 

 2-loculariSp 



V. SEGREGATA. 



668. ELEPHANTEPUS. Recept. nudum. Pappus seta- 

 ceus. Calyculus 4'florus. Corollulce ligulatae, her- 

 maphroditae. 



I. MCiUALlS, 



593. CICHORIUM. Gen. pi. 1251. 



Intyius. i. C, fioribus axillaribus geminis subsessilibus, foliis runcU 



natis. Willd. sp.pl. 3. p. i624. 



Icon. Fl. dan. 907. Engl. lot. 53g. 



Ih fields and on road sides : Pensylvania, near Philadel- 

 phia. Most certainly introduced from Europe. %. 

 July, Aug. V. V. Flowers beautiful blue. 



