344 TENTANDRIA DIGYNlA. 



gins cartilaginous, sometimes slightly cord^e, .tlje base sudtlenly 

 Harrowed, embracinj^ the stem. The stem dichotomous near tlie suni^;^ 

 iTiit with a head of flowers in each division, all on pedicels 1 — 3 aiches 

 long. Involucrum 8 leaved, a little longer than tlie head j leaves li- 

 near lanceolate, with £ or 4 rigid teeth. X'alyx 5 leaved, persistent j 

 leaves ovate, acute, mucronate, green, white or pale blye at base. 

 Fetals linearlanceolate, white or pale blue, contracted at the middle 

 and bent to the germ. Filaments twice as long as the calyx, inserted 

 between the petals. Jnthers incumbent. Styles fUlform, exnanding. 

 S'/i^mfls obtuse. iSget?s 2, united, angular. ^ 



Grows in the damp pine barrens, in the middle country. 



Flowers July — September. 



4. FcEriDCM. 



-I 



E. foliis radicalibiis Ian- I Radical leaves lanceo- 

 ceolatis, serratis, florali- late, serrate, floral leaves 

 biismultifidis; caiiledich- | many cleft; stem dicho- 

 otorao. Sp.pl. 1. p. 1356. j.tomous. 



Mich. 1. p. 163. Pursh, 1. p. 189. 



/Sffem herbaceous, 1 hoi high, slightly angled, divided near the sum- 

 mit ; the small branches flexuous. Root leaves obtuse, with weak, 

 spinelike serratures ; leaves at the forks of the stem opposite, am- 

 plexicaulc, wedge shaped, dentate, 3 cleft to the middle. Involucrum. 

 6 leaved, longer than the head ; leaves rigid, furnished with 1 or « 

 teeth; chaff linear, acute. Linn. 



This species is a native of the West-Indies, and though given to 

 us by all writers, is at least one of our doubtful species. Micha'ix 

 lound it in Florida. 



e> 



5. Aromaticum. Baldwin. 



E. caule folioso ; foliis j Stem leafy ; leaves cUs- 

 cuspidatis, pinnatis, apice I pidate, pinnate, 3 rleft at 

 trifidis, marginibus carti- j the summit, cartilaginous 



lagineis ; tnvolucro pen- | aloi _ 



taphyllo, foliolis trifidis ; [ lucrum 5 leaved, leaves 



paleis tricuspidatis. B. | 3 cleft ; chaff 3 pointed. 



Root perennial, consisting of large woody fibres, very aromatic, 

 Stems ^-^ 10 inches high, many from each root, often dichotomous 

 near the base. Leaves bristly, pinnate, crowded on the stem, and re- 

 markable for_ their silvery cartilaginous margin. Heads numerous, 



on long divaricate peduncles, forming a kind of corymb. Involucrum 

 the length of the head. ^ Bald. 



Grows in dry pine barrens ; Florida, 



Flowers August— November. 



■■h J 



