OF NORTH AMERICA. '61- 



&c. A very small sp. well described by Nut- 

 tal, creeping pedal, found from New England 

 to Ohio. Almost a peculiar Genus by the shape 

 of calix, but petals as in E. muricatus — Thus I 

 have nearly rectified this G. and 8 sp. of it. 

 My N. sp. are distinct from E. verrucosus and 

 latifolius of Europe which I have. 



Natural family of SPIRADIA. 

 The Linnean Genus Spirea has been kept 

 nearly entire by Decandole but divided into 

 subgenera, that differ so much in habit and 

 characters that they ought to become Genera. 

 Filipendula of Tournefort, Aruncus of Adanson, 

 Gillenia of Mench, now generaly adopted, and 

 Purshia of Decand. are certainly peculiar Gen- 

 era, as well as my G. Thecanisia, Epicostorus 

 &c. As early as 1815 I formed a new family 

 the Spirades in my Analysis of Nature page 

 173 with these Genera, adding Rhodalix, Ba 

 silima, Drymopogon; the Genera Tigarea, Neil 

 lia ? Tetracera, Suriana, tf-c probably belong 

 to it. This natural family is quite distinct from 

 the Poterides and Senticoses by the fruit cap- 

 sular with lateral styles and opening valvular. 

 Gillenia, Aruncus, Thecanisia, Filipendula 

 that are not frutescent will be illustrated else- 

 where and in my fl. tellur. I now propose to re- 

 vise the shrubby Genera chiefly, which are Spi- 

 rea, Physocarpa, Basilima, Schizonotus and 

 Epicostorus. The Monographs of Spirea by 

 Smith in Rees, Poiret in Cycl. and Seringe in 

 Decandole are by no means perfect even as to 

 species and synonyms and I shall rectify them. 

 I have verified many kinds by the figures of 

 Pallas in flora Rossica, which had not always 

 been properly applied and quoted. 



