410 Karl M. Wiegand and Arthur J. Eames 



blunt erose petaloid tips ; corollas 5.5-7 mm. long ; longest pappus hairs 

 8-9 mm. long; achenes 1.5-1.8 mm. long; staminate plants very rare, the 

 tips of the involucral bracts very broad, firm, petaloid, scarcely erose, the 

 pappus hairs dilated at the summit, and there merely undulate or entire. 



6. A. occidentalis 



d. Rosette leaves somewhat rhombic-obovate, with rounded apex ; pistillate 



plants with 8-20 cauline leaves ; outer involucral bracts with narrowly 



oblong blunt petaloid or more attenuate scarious tips ; corollas 5-6 mm. 



long; longest pappus hairs 6-8 mm. long; mature achenes 1.3-1.6 mm. 



long; staminate plants frequent, the involucral bracts with broad, firm, 



petaloid, obscurely erose tips, and the pappus hairs moderately or not at 



all dilated, barbellate to the tip. 7. A. fallax 



b. Rosette leaves, especially those of the stolons, bright green and glabrous above, 



or at most with a few evanescent arachnoid hairs, and in size and outline 



resembling those of no. 7 ; bracts of the pistillate heads attenuate, subscarious ; 



corollas 5-6.3 mm. long ; longest pappus hairs 7.5-8.5 mm. long ; achenes 1.6-2.2 



mm. long ; staminate plants rather rare, the involucral bracts broadly dilated, 



erose or subentire, and the pappus hairs more or less dilated, barbellate to the 



tip. 8. A. Parlinii 



1. A. neglecta Greene. Ladies' Tobacco. Pussy's Toes. 



Damp or rather dry gravelly pasture-lands and fields usually deficient in lime ; 

 locally frequent. May 6-30. 



Frequent in the valleys s. w., s., and e. of Ithaca, along the lake cliffs, and n. of 

 the lake ; also in the McLean region. Staminate plants frequent or common. 



Me. to N. Y., 111., and Nebr., southw. to D. C, Ind., Mo., and Kans., including 

 the Coastal Plain. 



2. A. canadensis Greene. Ladies' Tobacco. Pussy's Toes. 



Damp or more often dry gravelly or stony fields, pastures, and wood borders, in 

 soil usually deficient in lime ; generally common. May 8-30, mostly May 10-25. 



Common on the hills s. w., s., and e. of Ithaca, in the McLean region, along the 

 lake cliffs, and on the Ontario plain. Staminate plants not reported. 



Que., N. S., and Me., to Man., southw. to Conn., N. Y., Ont., Mich., and Wyo., and 

 in the mts. to Va. ; infrequent or rare on the Coastal Plain. 



3. A. petaloidea Fernald. Ladies' Tobacco. Pussy's Toes. 



Damp or dry gravelly pastures and fields and in ravines, in the more calcareous 

 regions; generally common. May 15-23, more rarely May 9-30. 



Common in the hills s. w. and s. of Ithaca, along the e. shore of Cayuga Lake, on 

 the Ontario plain, and especially eastw. to the McLean region. Staminate plants 

 not reported. 



Que. and Me. to Wis., southw. to Mass., n. Pa., Ont., and Mich. ; rare or absent on 

 the Coastal Plain. 



3a. A. petaloidea Fernald, var. noveboracensis Fernald. ( See Rhodora 23 : 296. 

 1921.) 



In soils similar to the preceding, or possibly more sterile. 



Frequent in the hills s. w., s., and e. of Ithaca, and in the McLean region. Stami- 

 nate plants not known. 



Cayuga Lake Basin, and near Rochester, N. Y. 



4. A. neodioica Greene. Ladies' Tobacco. Pussy's Toes. 



Drv gravelly or stony sterile pastures and fields, in noncalcareous soils ; frequent. 

 May "15-25. 



