Complimentary 
NEW SERIEJS VOL. X 
NO. 9 
ARNOLD ARBORETUM 
HARVARD UNIVERSITY 
BULLETIN 
OF 
POPULAR INFORMATION 
JAMAICA PLAIN, MASS. JUNE 24, 1924 
Catawbiense Hybrid Rhododendrons. The first of the so-called Cataw- 
biense Hybrids was raised in England in 1826, between Rhododendron 
catawbiense and R. arboreuw , and was named R. alta-clerense. It is 
doubtful if this plant is still in existence. There are forty-eight vari- 
eties of the Catawbiense Hybrids growing in the Arboretum raised at 
Knaphill Nursery, Woking, Surrey, England, by Anthony Waterer who 
by his exhibit at the Centennial Exhibition in Philadelphia did more 
to make these plants known in this country than anyone else. At this 
Exhibition fifteen hundred plants in eighty varieties were arranged un- 
der the general charge of Mr. Anthony Waterer himself who came to 
America for that purpose. Most of these plants were presented to 
Professor Sargent, and a large part of his visit was passed in Boston 
where he learned that it is as-easy to acquire a serious attack of gout in 
New England as it is in England. As a rule persons like to make col- 
lections in this country of many kinds of these Rhododendrons, but much 
better results are obtained by confining collections to not over a dozen 
varieties and by planting several individuals of each of these varieties 
together. Twelve varieties recommended by the Arboretum, where 
they have been growing uninjured for about thirty years, are: H. W. 
Sargent (crimson). Album elegans, Album grandiflorum, Catawbiense 
album (white), James Mackintosh (red), Mrs. C. S. Sargent (rose), Pur- 
pureum grandiflorum (dark purple), Roseum elegans (rose pink), Henrietta 
Sargent (rose), Charles Dickens (bright red), Everestianum (rosy lilac), 
and atrosanguineum (dark red). 
Rhododendron delicatissimum is a hybrid between R. catawbiense 
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