Page:An introduction to physiological and systematical botany (1st edition).djvu/459

 Rh segments of the calyx, though retained by Jussieu, may perhaps be scarcely distinct; yet there is a difference in their habit, which has induced me to leave it for further consideration. Haller united them both with Fragaria and Comarum, which the character and habit of the latter totally forbid, and Gærtner has well suggested a mark from the smoothness of the seeds in Fragaria, (as well as Comarum) to strengthen that of its pulpy receptacle. Whatever difficulties may attend these genera, how admirably does the fruit serve us in Rosa, Rubus, Dryas and Geum, to discriminate those whose leaves, flowers, and habit all stamp them as distinct! A student cannot do better than to study this order and these genera, as an introduction to the knowledge of more obscure ones; and the beautiful plants which compose it, mostly familiar to every body, are easily obtained.

13. Polyandria. Stamens numerous, inserted into the Receptacle.

1. Monogynia. The genera of this order are