AMYGDALACEAE 569 



185. Crataegus Bushii Sarg. A large shrub, or a small tree 4-7 m. tall, with a 

 trunk sometimes 2-2.5 dm. in diameter covered with dark brown fissured and scaly bark. 

 Leaf-blades pbovate or elliptic, or on leading shoots sometimes suborbicular, 2-7 cm. long, 

 1-3.5 cm. wide, glabrous or glabrate in age, either rounded or pointed at the apex, wedge- 

 shaped or more abruptly contracted at the base, the margins serrate above the middle ; 

 petioles 5-15 mm. long, eventually glabrous : corymbs broad, compound, glabrous, many- 

 flowered : pedicels and hypanthium glabrous : sepals 4-5 mm. long, mostly entire : corolla 

 2-2.5 mm. wide : stamens 20, the anthers bright rose-color : fruit oblong, 7-10 mm. long, 

 at maturity green tinged with dull red, the flesh thin and firm : nutlets 2-3, about 6 mm. 

 long. 



Upland woods, Fulton, Arkansas. 



7. COTONEASTER Medic. 



Shrubs, with much branched stems. Leaves alternate, stipulate : blades simple. 

 Flowers in corymb-like cymes or rarely solitary. Sepals 5, persistent. Corolla white. 

 Petals 5, scarcely clawed. Stamens numerous. Ovary 2-5-celled, the carpels more or less 

 distinct above : styles 2-5. Ovules 2 in each cavity or carpel, erect. Pome ovoid, globose 

 or turbinate, the carpels bony at maturity. 



1. Cotoneaster Pyracantha (L. ) Spach. An evergreen shrub, 1-2.5 m. tall, with 

 slender spines, 1-2.5 cm. long. Leaves persistent ; blades oval or slightly oblanceolate, 

 2-5 cm. long, obtuse, crenulate, glabrous, short-petioled : cymes many-flowered : pedicels 

 and hypanthium pubescent : sepals ovate : corolla about 6 mm. broad : pomes depressed- 

 globose, about 4 mm. high, scarlet, bitter. 



In thickets and cultivated grounds, Pennsylvania to Tennessee and Alabama. Naturalized from 

 Europe and Asia. Spring. 



FAMILY 14. AMYGDALACEAE Reichenb. PLUM FAMILY. 



Shrubs or trees more or less manifestly imbued with prussic acid, with a 

 smooth or flaky bark which often exudes gum. Leaves alternate, deciduous or 

 persistent, with deciduous stipules : blades various, simple, leathery or mem- 

 branous, mostly toothed. Flowers perfect, in clusters, corymbs or racemes. 

 Calyx of 5 sepals, inferior, deciduous. Corolla of 5 distinct petals inserted on 

 the hypanthium. Disk annular. Audroecium of numerous stamens inserted 

 with the petals. Anthers 2-celled. Gynoecium of a single carpel or rarely of 2 

 or 3 carpels. Ovary 1 -celled. Style simple. Stigmas truncate or peltate. 

 Ovules 2, pendulous. Fruit a drupe. Seed solitary. Endosperm wanting. 

 Embryo with fleshy cotyledons. 



Style basal : ovules erect. 1. CHRYSOBALANUS. 



Style terminal : ovules pendulous. 



Drupe with a pulpy exocarp : leaves deciduous : flowers in clusters or terminal 



racemes. 



Calyx sessile or nearly so : stone coarsely wrinkled and pitted. 2. AMYGDALUS. 



Calyx manifestly pedicelled : stone neither wrinkled nor grooved. 



Flowers in corymbs from scaly buds of the branches of the preceding 



year, before the leaves. 3. PRUNUS. 



Flowers in racemes terminating branches of the year, after the leaves. 4. PADUS. 

 Drupe with a dry exocarp : leaves persistent : flowers in axillary racemes. 5. LAUROCERASUS. 



1. CHRYSOBALANUS L. 



Shrubs or trees, with erect or underground stems. Leaves alternate : blades simple, 

 leathery, often lustrous. Flowers perfect, white or greenish, in cymes, pedicelled. Hypan- 

 thium campanulate or turbinate. Sepals 5, nearly equal, imbricated. Petals 5, deciduous. 

 Stamens numerous, sometimes 15, inserted with the petals : filaments distinct or united at 

 the base, glabrous or pubescent. Ovary inferior, 1-celled, sessile : style basal, filiform. 

 Ovules 2, erect. Drupe pulpy, often edible, the stone 5-6-ridged. Seeds solitary. 



Leaf-blades several times longer than broad : inflorescence terminal : filaments and ovary glabrous. 



1. C. oblongi/olius. 

 Leaf-blades as long as broad or nearly so : inflorescence axillary : filaments and 



ovary pubescent. 2. C. Icaco. 



1. Chrysobalanus oblongif olius Michx. A low shrub, forming wide patches by the 

 spreading of underground stems, the branches erect, 1-3 dm. tall, simple or sparingly 

 branched. Leaf -blades oblanceolate to oblong, or cuneate, 3-12 cm. long, subulate-tipped, 



