110 FOUNDATIONS OF BOTANY 



V. AMELANCHIER, Medic. 



Shrubs or small trees with smooth gray bark. Leaves 

 simple, sharply serrate, petioled. Flowers white, in racemes. 

 Calyx-tube 5-cleft, adnate to the ovary. Petals oblong. 

 Styles 5, united below. Ovary 5-celled, 2 ovules in each cell, 

 often only 1 maturing. Fruit small, berry-like.* 



1. A. canadensis, Torr. and Gr. Service Berry, June Berry, 

 Shad Bush, Sugar Tlum, Sugar Pear, Wild Pear. A small 

 tree, branches downy when young, soon becoming smooth. Leaves 

 ovate to elliptical, finely and sharply serrate, acute at the apex, 

 usually obtuse or cordate at the base. Racemes slender, many- 

 flowered, appearing before or with the leaves. Flowers showy. 

 Petals 4 or 5 times the length of the smooth sepals. Fruit globose, 

 dark red, edible. In rich woods ; extremely variable in height, and 

 in shape of leaves.* 



VI. CRAT^GUS, L. 



Shrubs or small trees, mostly with numerous strong spines, 

 wood very hard. Leaves serrate, lobed or deeply incised, 

 petioled. Flowers white or pink, in terminal corymbs or 

 sometimes solitary. Calyx-tube urn-shaped, 5-cleft, the limb 

 persistent. Petals round. Stamens few or many. Styles 

 1-5, distinct ; ovules 1 in each cell. Fruit a small pome with 

 bony carpels.* [The species are hard to distinguish and are 

 not very perfectly defined. At present the genus is under- 

 going a careful revision by Professor C. S. Sargent.] 



1. C. coccinea, L. Scarlet-fruited Thorn, Red Haw. A tall 

 shrub or small tree, with smooth, reddish branches, but the young 

 shoots downy. Leaves thin, roundish-ovate, cut-lobed or sharply 

 toothed, slender-petioled. Flowers large, in a many-flowered corymb. 

 Fruit bright red, nearly globular or obovoid, ^ in. long. 



Var. mollis, Torr. and Gr., has the young shoots densely covered 

 with down and fruit twice the length of the preceding, sweet and 

 edible. Common in the Mississippi valley. 



2. C. tomentosa, L. Pear Thorn. A small tree, the young 

 shoots, peduncles, and calyx downy or soft-hairy. Leaves large, 

 thickish, ovate or ovate-oblong, downy beneath, doubly serrate or 

 cut-lobed. Flowers later than No. 1, sometimes 1 in. in diameter. 

 Fruit scarlet or orange, rather less than 1 in. long, edible. 



3. C. Crus-Galli, L. Cockspur Thorn. Small trees with spread- 

 ing branches ; spines usually numerous, long and stout, but some- 



