1912] Wiegand,— Amelanchier in eastern North America — 131 
In 1810 Mespilus arborea was described by Michaux.' The long, 
detailed descriptive account and the plate leave little doubt that 
his plant was the M. canadensis of Linnaeus. "This account is, in 
fact, the best one of this species in literature. With the exception 
of the rather sweeping statement that the species is found throughout 
the United States (which, of course, in those days meant the Eastern 
United States) as well as in Canada, except in the lower parts of the 
two Carolinas and in Georgia, the original description seems to describe 
only typical Amelanchier canadensis.  Michaux's statement of range 
must have included A. laevis either inadvertently or because of a 
lack of familiarity with the shad-bushes of New England. 
In 1825 Aronia subcordata Raf. and Malus microcarpa Raf. were 
published by DeCandolle? as possible synonyms of his Amelanchier 
ovalis 3 subcordata (“ Aronia subcordata Raf.? in litt. Malus microcarpa 
Raf! dec. (v.s.).” A. ovalis 8 subcordata of DeCandolle was probably 
A. canadensis, and therefore the Rafinesquean names become syno- 
nyms of the Linnean species. 
In 1836 a plant was described from northern Kentucky by Riddell ? 
under the name Aronia latifolia. From the description one would 
judge this to have been Amelanchier sanguinea; but there exists a 
small flowering specimen in the Torrey Herbarium at the New York 
Botanical Garden which from handwriting and locality is undoubtedly 
a duplicate type. After considerable study the writer is inclined to 
believe this specimen to be a hybrid of A. humilis with A. laevis. 
This interpretation seems reasonable, too, because no specimens 
of 4. sanguinea have been seen by him from either Kentucky or 
southern Ohio. 
In 1838 Tausch * described Pyrus Neumanniana and P. Wangen- 
heimiana based on material growing in the Leibnitz garden at Prag. 
These two names have long been a puzzle to botanists. The two 
sheets already referred to as in existence in the Bernhardi Herbarium 
at St. Louis are, therefore, of great importance in this connection. 
According to the writer's judgment they are both hybrids. The hairy 
petioles and peculiar teeth, as well as leaf-apex, of the mature leaves 
on the specimen labeled P. Wangenheimiana suggest Amelanchier 
1 Hist. Arb. Am. Sept. 
2 Prod., ii. p. 632. 
3 Sup. Cat. Pl. Ohio, p. 24. 
* Flora, xxi. pt. 1, Beibl. p. 76, and pt. 2, p. 714. 
