248 Karl M. Wiegand and Arthur J. Eames 



Newf. to Va. along the coast, and up the rivers in N. E. ; also around the Great 

 Lakes from the city of Quebec to Michigan. 



In its dwarf substoloniferous habit this species resembles A. humilis, but the leaf 

 margin is distinctive. 



5. A. intermedia Spach. {A. canadensis, form, no. 298 of Cayuga Fl.) 

 Thickets, in boggy calcareous or noncalcareous soils ; scarce. May 10-20. 

 Michigan Hollow Swamp ; South Hill Marsh ; Freeville Bog ; Mud Pond, McLean 



Bogs ; Lake Como ; Lowery Ponds ; Junius peat bogs ; Miller Bog, Spring Lake ; 

 Featherbed Bog. The stations are all more or less calcareous except the South Hill 

 and Junius peat bog stations. 

 Vt. to w. Pa., southw. to N. C. ; not reported from the Coastal Plain. 



6. A. canadensis (L.) Medic. {A. c, var. Botryaphwi, of Gray's Man., ed. 7. A. c, 



var. oblongifolia, of Cayuga Fl.) Shadbush. 



Dry exposed hedgerows, ravine crests, and slopes, in gravelly or sandy neutral 

 soils ; common. May 1-15. 



Less abundant on the chestnut soils w., s., and s. e. of Ithaca. 



N. S. and e. Me., and from w. N. E. to Wis., southw. to Ga., La., and Mo.; rare 

 in e. N. E. and on the Coastal Plain. Not a plant of acid sands and granitic soils. 



7. A. laevis Wiegand. {A. canadensis of Gray's Man., ed. 7, and of Cayuga Fl.) 



Shadbush. June Berry. Service-berry. 



Damp or rather dry woodlands and thickets, usually in more acid soils than the 

 last preceding species; common. May 1-15. 



Especially common on the hills of Newfield, Danby, Spencer, and Caroline, and 

 around the peat bogs ; in the ravines, usually confined to the south slopes. 



Newf. throughout N. E. to Mich., southw. to Ga., Ala., and Kans. ; rare on the 

 southern Coastal Plain, probably because of the climate. A plant of more northern 

 distribution and of more acid soils than A. canadensis. 



Hybrids of this and of A. canadensis are frequent. 



The fruit of all local species of Amelanchier except A. canadensis is dark, juicy, 

 and edible; that of A. canadensis is red, dry, and mealy, and falls early. 



11. Crataegus L. 21 



a. Leaves deeply pinnately lobed, the lobes few-toothed ; spines 0.5-3 cm. long ; sepals 

 short, broad, and blunt ; style and nutlet 1 ; fruit 4-7 mm. in diam. 



1. C. monogyna 

 a. Leaves serrate, often also incised or shallowly lobed; spines if present usually 

 longer than in no. 1 ; sepals acute ; styles and nutlets 2-5, rarely 1 in no. 2 ; fruit 

 usually larger than in no. 1. 

 b. Leaves conspicuously cuneate, in outline oblanceolate, obovate, or oval ; veins 

 ascending ; winter buds not glutinous, or slightly so in no. 5 ; styles and nutlets 

 (1) 2-3 (4). 

 c. Stamens 7-10 22 ; leaves glabrous, or hairy only on the veins, or strigose above. 

 d. Petioles slender, when young 0.7-0.9 mm. in diam., when old 0.7-1.6 mm. in 

 diam.; veins not prominent, often irregular, little impressed; (fruits 7-15 

 mm. in diam.). 



21 The forms here listed are those which seem to be unquestionably good species, together with 

 several others which, though having the appearance of hybrid origin, cannot readily be so inter- 

 preted. Many other forms also occur, but these are mostly of more erratic distribution and can 

 usually be interpreted as crosses between species present in the same locality. Such hybrid 

 individuals are not given special mention in the text. Much remains to be done before the 

 species in the Cayuga Lake Basin are fully understood and their nomenclature is satisfactorily 

 worked out. The present treatment, therefore, must be considered provisional. Much informa- 

 tion about soils and distribution has been contributed by William Moore. 



22 Seen on the fruit as well as in the flower. 



