The Flora of the Cayuga Lake Basin 247 



c. Petals 16-22 mm. long ; lower pedicels 27^40 mm. long ; calyx 7-9 mm. in 

 diam. to curve of sepals, the sepals 3-5 mm. long; anthers 1-1.2 mm. long; 

 leaves more glaucous and more quickly glabrate; plant scarcely stolonif- 

 erous ; stems solitary or few. 2. A. amabilis 



b. Leaves oblong, with more irregular veins and less prominent teeth ; calyx 

 4-5 mm. in diam. to curve of sepals, the sepals 2-3 mm. long ; petals 7-10 mm. 

 long; plant 1.5 m. high or less, stoloniferous. 3. A. humilis 



a. Leaves finely toothed, generally blunt ; hypanthium prominent or often incon- 

 spicuous on the young fruit; sepals revolute; summit of ovary woolly; low 

 stoloniferous shrubs 1.5 m. high or less (see also 3d a). 4. A. stolonifera 



a. Leaves finely toothed, often acuminate ; hypanthium inconspicuous on the fruit ; 

 sepals revolute or more commonly reflexed; summit of ovary glabrous, or with 

 a few hairs in no. 5. 

 b. Leaves oblong or oblong-obovate, acute, hairy when young, often with a tinge 

 of red; petals 6-8 mm. long; tall shrubs with an alder-like habit, growing in 

 clumps ; sepals ascending, spreading, or irregularly revolute. 5. A. intermedia 

 b. Leaves ovate or obovate, short-acuminate; petals 10-18 mm. long; small trees 

 when mature, not in clumps. 

 c. Foliage and inflorescence tomentose when young; petioles and often the blade 

 hairy at maturity; hypanthium 2.5-3 (3.5) mm. in diam.; sepals broad, 

 strongly reflexed. 6. A. canadensis 



c. Foliage and inflorescence glabrous from the first, the foliage, when young, 

 bronze-red or rarely bright green; hypanthium larger, (3) 3.5-5 mm. in 

 diam. ; sepals narrower, reflexed. 7. A. laevis 



1. A. sanguinea (Pursh) DC. (A. spicata of Gray's Man., ed. 7. A. canadensis, 



var. rotundi folia, in part, of Cayuga Fl.) 



In dry open fields and on ledges, in sterile noncalcareous soils ; frequent. May 

 15-25. 



Characteristic of the chestnut soils and sandstone ledges of the hills s. w., s., and 

 s. e. of Ithaca, and found more sparingly on the cliff crests along the lake shore from 

 Esty to Willets : hilltop, North Spencer ; hill crests and rocks, Thatcher Pinnacles 

 (£>.!) and White Church (£>.!); Connecticut Hill; Enfield Glen; Turkey Hill; 

 toward McKinneys and Esty Glen; lake cliffs, Ledyard ; Elm Beach, Romulus; dry 

 woods, Vandemark Pond. 



Me. to Wis., southw. in the mts. to Ala. 



2. A. amabilis Wiegand. (A. canadensis, var. rotundifolia, in part, of Cayuga Fl. 



A. sanguinea, forma grandiflora Wiegand. A. grandiftora Wiegand not Rehder.) 

 Dry cliffs in the ravines and along the lake shore, on more calcareous rocks than the 

 preceding; frequent. May 15-25. 



Enfield Glen ; Fall Creek Gorge ; Taughannock Gorge ; lake shore slopes near 

 Esty Glen and McKinneys ; Portland Point ; Genoa ; Ledyard ; Romulus ; and else- 

 where. 



Cent, and w. N. Y. to Ont. A plant of limy regions. 



3. A. humilis Wiegand. 



Dry calcareous ledges and talus; rare. May 15-20. 



Along the railroad just n. of McKinney Twin Glens (type station) ; cliffs of 

 Cayuga Lake at Willets, and just s. 

 Vt. to Minn, and Mackenzie, southw. to e. and cent. N. Y., Ohio, and Nebr. 

 Hybrids of this species with A. sanguinea are frequent. 



4. A. stolonifera Wiegand. 



Dry sandy or gravelly noncalcareous soils; rare. May 15-25. 



Roadside and barren field s. w. of Pout Pond, 1919 (K. M. W ., A. J. E., & L. F. 

 Randolph) ; roadside and fence rows s. of Waterloo, 1924. 



