The Flora of the Cayuga Lake Basin 173 



a. Bark of trunk exfoliating in strips or plates ; husk of fruit readily splitting to the 



base. 



b. Leaflets 5 (7), the lower pair much smaller than the others; nut rounded or 



barely pointed at base, whitish, 1.5-2.5 cm. long; twigs gray, or reddish brown. 



c. Nut not plainly ridged, globose or nearly so, ripe Sept.-Oct. ; husk thin, 1-2.5 



(3) mm. thick when dry; leaves glabrous or nearly so. 3. C. ovalis 

 c. Nut ridged or angled, more or less flattened, ripe Oct.-Nov. ; husk (3) 4—15 

 mm. thick when dry ; leaves usually puberulent or downy beneath and on 

 rhachis. 4. C. ovata 



b. Leaflets 7 (5-9), pubescent, the lower pair not very much smaller than the 

 others; nut more" plainly pointed at base, yellowish white, 2.5-5 cm. long; 

 husk thick; twigs buff, or yellowish brown. 5. C. laciniosa 



1. C. cordiformis (Wang.) K. Koch. (C. aniara of Cayuga Fl.) Bitternut. 

 Rich woods and roadsides, in various soils, especially in the ravines ; frequent. 



May 25-June 10. 



Six Mile Creek (£>.!) ; near Renwick (D.\) ; Freeville and McLean (D.\) ; 

 Cayuga Lake ravines (D. !) ; Crowbar Point (D.) ; Paine Creek; Aurora (D.) ; 

 Levanna (D.) ; and elsewhere. 



N. E. and Que. to Minn., southw. to Fla. and Tex.; less frequent on the Coastal 

 Plain. 



2. C. glabra (Mill.) Sweet. (C. p.orcina of Cayuga Fl.) Pignut. 



Dry heavy or medium soil, chiefly acid or neutral; common. May 20-June 15. 

 Cent. N. E. and Ont. to Minn., southw. to Fla. and Tex., including the Coastal 

 Plain. 



3. C. ovalis (Wang.) Sargent. (See Bot. Gaz. 66:245. 1918. C. microcarpa Nutt. 



of Gray's Man., ed. 7, and of Cayuga Fl.) 



In various soils, chiefly heavy; frequent, especially about Ithaca. May 15-June 10. 



Eagle Hill and Snyder Hill (D.) ; C. U. campus (£>.!) ; C. U. farm; Turkey Hill; 

 Cayuga Lake shore ; Canoga. 



Cent. N. E. to Ont. and Iowa, southw. to Va., Ga. (?), Tenn., and Mo., including 

 the Coastal Plain. 



In the Cayuga Lake Basin this species appears much like a hybrid between C. ovata 

 and C. glabra. 



4. C. ovata (Mill.) K. Koch. (C. alba of Cayuga Fl.) Shagbark Hickory. 



In various soils, light or heavy, acid or neutral ; common. May 15-June 10. 

 N. E. and Ont. to Minn., soutbw. to Fla. and Tex. ; less frequent on the Coastal 

 Plain. 



5. C. laciniosa (Michx. f.) Loud. (C. sulcata of Cayuga Fl.) Western Shag- 



bark Hickory. 



Rich lowlands ; rare. May 25-June 10. 



Roadside below Ringwood, probably introduced ; Ithaca-Slaterville road near the 

 6-mile post, probably introduced ; borders of the Cayuga marshes, w. of Cayuga 

 Bridge (D.) ; along the Seneca Canal three or four miles s. w. of Montezuma village ; 

 Clyde River, Galen; occasional in low woods at Junius (D.). [A fine stand in 

 swamp at head of Owasco Lake.] 



Cent. N. Y. and s. w. Ont. to Nebr., southw. to Pa., s. Ind., Tenn., and Okla. A 

 plant of the alluvial soils of the Ohio and Mississippi Valleys, reaching its extreme 

 northeastern limit in the Cayuga Lake Basin (see Dudley's Cayuga Flora for an 

 extended account of this species). 



