100 



spicata, oralis, and rotundifolia may now be considered. The last 

 two names are not available, as they were early used for the Euro- 

 pean species. There appear to be two forms of this second class 

 in eastern North America. The first is a northern form mostly 

 confined to Canada and the high or northern sections of the 

 United States. It has large and nearly round leaves, generally 

 coarsely toothed, often approaching A. aliiifolia in that respect, 

 has white flowers, and is often quite large or a small tree. The 

 second form is more southern, more dwarf, with oval leaves, late, 

 often yellow, flowers, and late-ripening fruit. 



The first form seems to be the one named Crataegus spicata 

 by Lamarck, which he says is supposed to have been brought 

 from Canada. He saw the plant in cultivation. The com- 

 bination AviclancJiicr spicata was first made by Koch in 1869, 

 but he described A. intermedia {A. oblongifolia). However, as 

 he expressly and conspicuously cites Lamarck's Crataegus spicata, 

 his name must be considened as applying also to Lamarck's plant 

 and indeed the latter may be fairly interpreted as the type of the 

 binomial Amelanchier spicata. In 1874 Decaisne made the com- 

 bination again and he also described A. intermedia. Again in 

 1893 Koehne made the combination in his Dendrology, but he 

 has not described Lamarck's plant. The name is still available 

 and cannot be dropped, so it is taken up again : 



A. SPICAT.\ (Lamarck) Koch, Dendrologie i : 182. 1869. 

 (Excluding description.) 



Described by Lamarck, Encyclo. i: 84. 1784. He says it 

 is two or three times as high as the European species, leaves 

 rounded, dentate, nearly as wide as long, 1.5 inches in diameter. 

 Michaux in his Flora of North America 1:291. 1803, described 

 it under the name of JJespi/us canadensis var. rotundifolia : "'Ar- 

 boresens ; foliis suborbiculato-ovalibus, utrinque rotundatis." 

 Habitat, "in Canada." Tracings in the Gray Herbarium of two 

 leaves of Michaux' s specimen are evidently quite different from 

 the specimens Koehne has sent out to illustrate his book. An- 

 other name which seems to have been given to this form is 

 A. sanguinea (Pursh) De Candolle, 1825, and under any rules 

 which would preclude the use of a combination a second time 



