MISSOURL BOTANICAL GARDEN BULLETIN Bs 
Botanical name Common name Locality where last found 
10. DESTROYED BY CITY EXPANSION 
Crataegus 
FECUNGM cl eis.w oles Hawthorn......... The only known specimen of 
this tree, from which all 
now in cultivation origi- 
nated, was destroyed by the 
expansion of East St. Louis, 
Eb 
Hottonia inflata....American 
: feather-foil...... Ponds and lakes. This plant 
was found in a pond in 
North St. Louis. The pond 
has been filled and_ its 
exact location obliterated by 
streets and buildings. 
NOTES 
Dr. Hermann von Schrenk, Pathologist to the Garden, has 
been elected president of the Missouri Forestry Association 
which was organized December 7. 
Mr. L. P. Jensen, Arboriculturist to the Garden, gave an 
illustrated talk before the St. Louis Florists’ Club, January 
9, on ‘‘Our Vanishing Wild Flowers.’’ 
Dr. B. M. Duggar, Physiologist to the Garden, spoke before 
the biologists of Washington University, February 3, on 
‘‘Wilterable Diseases of Plants and Some Recent Studies on 
the Mosaic Disease of Tobacco.’’ 
The January-February issue of Parks and Reereation con- 
tains the following articles by Mr. L. P. Jensen: ‘‘A College 
Course for Nurserymen’’; ‘‘Oldest Living Trees’’; and ‘* Pub- 
lications of Interest to Park Executives.’’ 
Among those visiting the Garden recently were Dr. Otto 
Warburg, professor of botany, University of Berlin, Germany ; 
Professor H. W. Anderson, assistant professor of botany, Uni- 
versity of Illinois; Professor John T. Buchholz, professor of 
botany, University of Arkansas. 
Mr. G. H. Pring, Horticulturist to the Garden, gave an 
illustrated lecture before the St. Louis Florists’ Club, January 
13, on ‘‘A Trip through the American and African Tropics.’’ 
He also spoke before the Men’s Club of the Church of the 
