56 Introduction to Botany. 



or MISSOURI CURRANT. Flowers several in leafy-bracted racemes, yellow, spicy- 

 scented, ^ to i inch long. Calyx tube cylindric, about 3 times as long as the lobes. 

 Fruit smooth, yellow, becoming black. Along streams. 



ROSACES. ROSE FAMILY. 



Herbs, trees, or shrubs with alternate, mostly stipulate, leaves. 

 Flowers regular ; sepals 5, often subtended by as many sepal-like 

 bractlets ; petals 5, apparently inserted on the calyx ; stamens usually 

 indefinite, apparently inserted on the calyx (expanded border of the 

 base of the receptacle). Pistils i-many, distinct or united. Some of 

 our most beautiful flowers and best fruits belong to this family. 



Longitudinal diagrams of type flowers of the Rosaceae. A t plum; 

 B, rose ; C, strawberry. 



Ovary superior or half superior. 



Ripened pistil a drupe or drupelet. 



Fruit consisting of a single pistil. PRUNUS I. 



Fruit consisting of several pistils cohering over an elongated receptacle. RUBUS IV. 

 Ripened pistil a few- to several-seeded pod. 



Pistils 5-8; pods not inflated. SPIRAEA II. 



Pistils 1-5; pods inflated. PHYSOCARPUS III. 



Ripened pistil an achene. 



Carpels distinct and numerous on a convex receptacle, which becomes fleshy and edible 



in fruit. FRAGARIA V. 



Carpels distinct on a dry feceptacle; styles not lengthening in fruit; bracts conspicuous 



at the sinuses of the calyx. POTENTILLA VI. 



Carpels 2-6 on a short receptacle; styles not lengthening in fruit; bracts at the sinuses 



of the calyx minute or wanting. WALDSTEINIA VII. 



Carpels numerous on a dry conical or cylindrical receptacle; style persisting as a hairy 



or jointed tail to the achene. GEUM VIII. 



Ovary inferior. 



Pistils several, inclosed in an urn-shaped receptacle. ROSA IX. 



Pistil single, compound, its cells as many as the styles (2-5). 



Fruit a pome; ovary s-celled, its carpels 2-seeded. PVRUS X. 



Fruit a small, berrylike pome; ovary becoming lo-celled, its carpels 2-seeded. 



AMELANCHIER XI. 

 Fruit a small, drupelike pome with 1-5 bony stones. CRATVEGUS XII. 



