COMPOSITAE 327 



16. DOELLINGERIA Nees. 



Achenes terete, ribless, less than i mm. wide. 



Involucral bracts acute or acutish, the inner linear, ciliate at the tip. 



I. D. icmbellaia. 



Involucral bracts obtuse, the inner oblong-, ciliate. 2. D. humilis. 



Achenes much flattened, ribbed, over i mm. wide. 3. D. infirma. 



1. Doellingeria umbellata (Mill.) Nees. Tall FlaT-Top White 

 Aster. (Man. p. 970; I. F. f. 3829.) In moist soil, Newf. to Ga., west 

 to the N. W. Terr., Mich, and Ark. — Pennsylvania : Northampton ; 

 Monroe ; Delaware ; Chester ; Perry ; Franklin ; Huntingdon ; 

 Susquehanna ; Armstrong ; Allegheny. 



2. Doellingeria humilis (Willd.) Britton. Broad-leaved FlaT-top 

 White Aster. (Man. p. 970; I. F. /. j8jo.) In moist soil, southern 

 N.J. and Pa. to Fla. and Tex. — Pgfinsylz'auia : Delaware ; Lancaster. 



3. Doellingeria iafirma (Michx.) Greene. Cornel leaved Aster. 

 (Man. p. 970; I. F./. jSj/.) In dry, usually rock}' soil, Mass. to N. Y., 

 Pa. and Tenn. — Pennsylvania : Northampton ; Bucks ; Chester ; 

 Lancaster ; Franklin ; Huntingdon ; Allegheny ; Perry. 



17. lONACTIS Greene. 



1. lonactislinariifolius (L.) Greene. Savory-lEaved AsTER. (Man. 



p. 971 ; I. F. f. 3832.) In dry or rocky soil, Newf. to Quebec and Fla., 



west to Minn., Mo. and Tex. — Pennsylvania : Northampton ; Bucks ; 



Delaware ; Chester ; Lancaster ; Berks ; Monroe ; Allegheny. 



18. BACCHARIS L. 

 1. Baccharis haUmifolia L. Groundsel-treE. (Man. p. 971 ; I. F. 

 f. 3834. ) Along salt marshes and tidal rivers, extending beyond saline 

 influence, Mass. to Fla. and Tex. — Pennsylvania : Delaware ; Lan- 

 caster. 



19. GIFOLA Cass. 



1. Gifola Germanica (L. ) Dumort. Cudweed. Cotton Rose. 

 (Man. p. 972 ; I. F. /" 383S.) In dry fields, southern N. Y. to Pa. and N. 

 C. — Pennsylvania : Bucks ; Philadelphia ; Delaware ; Chester ; 

 Lancaster ; Franklin ; Allegheny. 



20. PLUCHEA Cass. 

 1. Pluchea camphorata (L. ) DC. Spicy or Salt-marsh Fleaban.^. 

 (Man. p. 973 ; I. F. f. 3S40.) In salt marshes, coast of N. H. to Fla., 

 Tex. and Mex. Also in the W. Indies. — Pennsylvania: Bucks, Bristol. 



21. ANTENNARIA Gaertn. 

 Basal leaves relatively small, mainly less than 5 cm. long, i-ribbed. 

 Blades of the basal leaves spatulate, abruptly pointed. 



1. A. neodioica. 

 Blades of the basal leaves oblanceolate or cuneate, acute or obtusish. 



2. A. neglecla. 

 Basal leaves relatively large, mainly over 5 cm. long, 3-5-ribbed. 



