MICHIGAN ACADEMY OF SCIENCE. 173 



Linnaeus in the Species Plantarum Ed. 1 478, 1753, described MfSspihis 

 Canadensis as follows: 



"Mespilus inermis, foliis ovato-oblongis, glabris serratis, caule 

 inermi. 



Mispilus inermis, foliis subtus glabris obverse-ovatis, Gron. Virg. 

 54. Habitat in Virginia, Canada. 5." 



In Systema Naturae XII, 343, 1767 as follows: 



"M. inermis, fol. ovato-oblongis glabris serratis actuisisculis. Tenera 

 Janata; adultior nuda." 



In the Species Plantarum both the description and the specific name 

 indicate the northern plant that is glabrous from the beginning or very 

 early becoming so. Even the reference to Gronovius is to a plant with 

 glabrous leaves. The inference is that at the time of Gronovius there 

 was in Virginia an Amelanchier with glabrous leaves or what is the 

 same thing from a bibliographical aspect, Gronovius thought they were 

 glabrous. In the Systema the description is of a plant, the young 

 leaves of which are lanate. In other words, Linnaeus, in the earlier 

 publication described the smooth-leaved plant and later revised the 

 description to include the one with tomentose leaves. As above in- 

 dicated, considering his concept of a species, this is not at all surprising. 

 The younger Linnaeus noticing the discrepancy, raised the plant with 

 tomentose leave to specific rank as Mespilus Botryapium in Suppl. 

 255, 1781. 



In any discussion of the application of the name Crataegus spicaia, 

 Lam. Enyc. 1, 84, 1783, one must not lose sight of the work of K. Koch. 

 (Dendr. 1, 1823, 1869) who has demonstrated, as far as it is possible 

 so to do, that the trees or their descendents, upon which LaMarck 

 based his species are still in existence in certain parks in France and at 

 the school of forestry there, and that these trees are what has later 

 been known as A. sanguina D. C. Furthermore, that the description 

 of LeMarck fits these trees in all particulars. The evidence seems to 

 be conclusive. The Michigan species of Amelanchier are as follows: 



A. Canadensis (Lin.) Medic, Gesch. 79, 1793. 

 Mespilus Canadensis Lin. Sp. PI. 478, 1753. 

 A. laevis Wiegand, Rhodora 14, 154, 1912. 



A small tree the young leaves of which are very thin, browTiish- 

 purple, and generally glabrous from the beginning. Farwell No. 48b, 

 Aug. 10, 1883 and No. 53, Aug. 17, 1883 from the Keweenaw Peninsula; 

 No. 13511, May 6, 1893 from Belle Isle and No. 48c, May 1, 1910 from 

 Orion. This species in all its varieties has the young leaves thin and 

 more or less brownish-purple. The type is a tree and the leaves are 

 glabrous from the beginning. Moist woods and thickets. 



