4' INTRODUCTION TO BOTANY.

flower of the Dog Rose, when taken collectively, are term-ed the Corolla; but when considered individually, Petals:so that the Dog Rose contains a corolla of five petals ; orotherwise a polypetalous * or many-petaled corolla; socalled, to distinguish it from those which are not divided, asin the Campanula, &c. where, being of one piece, it is term-ed a one-petaled or monopetalous corolla. This part ofthe flower is characterized by various different appear-ances, and the reader will find them well defined in Pro-fessor Martyn's Language of Botany, to which I wouldadvise him to refer.

Stamens. —These consist of three parts: The Filament,or thread which supports the small protuberance at top,called the Anther. The Pollen or Farina is the yellowdust which is discharged from this part when at its tea-

The s»-""-" B m tne tiower of the Rose are of a yellowcolour, and more than twelve in number. They are knownto vary much in different plants, not only in number, butalso in form, situation, colour, and size. And as this is theprincipal part which is to engage the attention of the youngbotanist at present, it will be necessary that he should beparticular in distinguishing them from the pistils.

Pistils —These also vary in form, size, and number,in different flowers; but they are chiefly situated in thecentre of the stamens, and are mostly upright, and of adifferent colour from them, and invariably want the tipsthat those always have. In the Rose their number issix or seven. Pistils are composed of three parts, i. e.the Stigma, which is the uppermost point, and is generallyspreading, but varies in form: in the Rose it is round; inothers it is angular, which will be treated of hereafter.

* Plain English terms might with propriety be used instead of thosewhich are Greek : but most writers bavin? preferred those, it will benecessary occasionally to use them; otherwise they will be on all oc-casions spared, and in particular those indelicate ones whieh are foundi« too many of our elementary books on this subject.