The Flora of the Cayuga Lake Basin 397 



c. Bristles simple, often serrate. page 



d. Achenes spiny or strongly papillose near the summit, beaked. 



c. Plant tall and branched; heads many 43. Chondriu.a 428 



e. Plant scapose, unbranched ; head solitary 44. Taraxacum 428 



J. Achenes smooth, rugose, or papillose throughout, beaked or beakless. 

 e. Achenes flat. 



/. Body of achene truncate at summit ; heads large, 12-40 mm. in 



diam., subcorymbose 45. Sonchus 428 



/. Body of achene beaked or with a narrow neck ; heads small, 4-10 



mm. in diam., paniculate 46. Lactuca 429 



c. Achenes not distinctly flattened or beaked. 

 /. Flowers pale purplish white, brownish, or cream color; heads 



pendulous 48. Prenanthes 431 



/. Flowers yellow or reddish ; heads erect. 



g. Pappus white; basal leaves usually runcinate 47. Crepis 431 



g. Pappus tawny ; none of the leaves runcinate or pinnatifid. 



49. Hieracium 432 



1. Eupatorium (Tourn.) L. 



a. Florets pale purple ; bracts of the involucre purple-tinged, numerous, very unequal, 

 several of the lower ones very short ; leaves whorled. 

 b. Florets 9-15, scarcely exserted; corolla 5 mm. long; inflorescence with divisions 

 generally flat-topped, purple ; stem usually conspicuously speckled with dark 

 purple, scarcely glaucous, not more purple at the nodes ; leaves finely crisp- 

 puberulent beneath. 1. E. maculatum 



b. Florets 3-6 (7), much exserted; corolla (5) 5.5-7 mm. long; inflorescence 

 convex, pale purple; stem scarcely speckled, glaucous, deep purple at the nodes; 

 leaves with looser pubescence beneath. 2. E. falcatum 



a. Florets white ; bracts greenish, fewer, less unequal ; leaves opposite. 

 b. Leaves sessile ; bracts unequal. 



c. Leaves connate ; bracts acute. 3. E. perfoliatum 



c. Leaves separate; bracts obtuse. 4. E. sessilifolium 



b. Leaves petioled ; bracts nearly equal. 5. E. urticaefolium 



1. E. maculatum L. (See Rhodora 22:57. 1920. E. purpureum, in part, of Cayuga 



Fl.) Joe-Pye Weed. 



Open grounds and the borders of thickets, along streams and in wet sedgy meadows, 

 in rich, often mucky, scarcely sandy, soil, generally in calcareous regions ; common. 

 Aug.-Sept. 



Newf . and Que. to Mich, and B. C, southw. to s. Pa., 111., and N. Mex. ; rare or 

 absent on the Atlantic Coastal Plain. 



2. E. falcatum Michx. (See Rhodora 22 : 57. 1920. E. purpureum, in part, of 



Cayuga Fl.) Joe-Pye Weed. 



Open woods and wood borders, in damp or rather dry rich light soil ; frequent. 

 Aug.-Sept. 



Enfield Glen, midway, and below the lower falls ; s. crest of Buttermilk Glen ; 

 Beebe Lake; Glenwood Road; North Lansing; Paine Creek; Utt Point; Big Gully; 

 w. of Lowery Ponds ; s. w. of Spring Lake. 



E. Mass. to Wis., southw. to Ga. and Okla. ; rare or absent on the Coastal Plain. 



3. E. perfoliatum L. Boneset. Thorough wort. 



Low open grounds, apparently without much soil preference ; common, and generally 

 distributed. Aug.-Sept. 



N. S. and N. B. to Man., southw. to Fla., Tex., and Nebr., including the Coastal 

 Plain. 



