48 BOTANICAL GAZETTE [yULY 
B. TENELLA Willd., which is rather widely distributed in the eastern 
United States, differs from the species just described in having more — 
numerous slightly smaller flowers of a more yellow cast and in well 
grown individuals borne in many short opposite 1~several-flowered 
cymes. The corolla is one and a half times the length of the calyx; 
its segments are narrower and more acute than in B. éodandra; the 
anthers are yellow; the stigma is mostly exserted; and the leaf scales 
are usually opposite. 
Centaurella Moser Steud. & Hochst. was distinguished from Bar- 
tonia verna by its still smaller flowers (4"™" long) racemosely arranged 
upon alternate branches, also by its more acutely lobed corolla twice 
the length of the calyx. The species is represented in herb. Gray by 
a specimen with the Torrey & Gray label but without data, and by 
Drummond’s specimen from Covington, La., cited in the original 
description. Both may be merely tall small-flowered specimens of ZB. 
verna. hey differ from B. zodandra in stature, inflorescence, consid- 
erably smaller flowers, narrower much more acute corolla lobes, and 
yellow anthers. In formerly classing the two plants together the 
writer placed too great importance upon the alternation of the leaf 
scales and the relative length of calyx and corolla— points of resem- 
blance which now seem of less weight than the differences above 
enumerated, which are probably of specific value.—B. L. RoBinsON, 
Gray Herbarium, Harvard University. 
NOTES ON SUNDRY AMERICAN PLUMS. 
THE plum section of the genus Prunus is of great interest 10 
American botanists and of still greater consequence to American 
horticulturists. But even after much careful work by some of our best” 
botanical and horticultural students there are still many difficulties it 
the delimitation and description of species. The horticulturists have | 
sought to avail themselves of the botanists’ classifications, but have : 
found them in many respects inadequate and ill-fitting; and thes? — 
horticultural difficulties have, to a considerable degree, reacted up? 
our ideas of the botanical classification of plums, bringing in doubts — 
and complications which would not have occurred to the botanists — 
working by themselves. At the present time the botany and the : 
horticulture of this group are inseparably linked. The horticultural 
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