65 
SYSTEMATIC BoTANY 
By ALFRED GUNDERSEN 
The Genus Staphylea 
With Mr. C. F. Doney, 
three hundred specimens o 
baria of the Brooklyn Botanic Garden, the New York Botanical 
Garden, the Arnold Arboretum, the U. S. National Herbarium, 
and the Missouri Botanical Garden. This genus is widely dis- 
tributed in Europe, Asia, and North America. Of twenty-eight 
names which have been assigned to Staphylea four belong to other 
families and five to the related genus Turpinia, others are syno- 
nyms or included in the accepted species, leaving only eight or 
ave been making a study of about 
Fal 
f the genus Staphylea from the her- 
{aay 
possibly nine distinct species. 
The Classification of Dicotyledons 
The study of floral structures of many species of dicotyledons 
has been continued, with drawings by Miss Maud H. Purdy. 
The drawings are dated, and we are gradually following up the 
study of missing parts of structures of flower buds at the proper 
season. Attention is being given especially to placentation and to 
changes in placentation as the flower develops, as illustrated in 
fig. 7. [Eichler wrote in his Bliittendiagramme, page 47, in 1874, 
‘the whole question of placenta-formation merits very much a 
new investigation, at the same time from a developmental and 
systematic-comparative point of view.” This holds true in 1934, 
— 
sixty years after. 
Flardy Species of Trees and Shrubs 
With Mr. Alfred Rehder, of the Arnold Arboretum, I have 
continued the work on an alphabetical list of trees and shru 
based on his Manual of Cultivated Trees and Shrubs. The plan 
of the work has been somewhat revised and expanded. In this 
work we have been joined by Mr. Henry Teuscher, dendrologist 
of the New York Botanical Garden. After each species there is 
given the author, the year of publication, height, geographic dis- 
tribution, and zone of hardiness. In case the species was first 
described under another genus that genus also is given. An ex- 
— 
IS 
ample follows : 
