122 Rhodora - [JUNE 
hybrid between Cornus rugosa! and C. stolonifera, as its characters 
are intermediate between these two species which grow together in the 
locality where a few individuals of the form in question were found. 
_Also the fact that the pollen of this supposed hybrid contains a large 
percentage of incompletely developed grains is in favor of the hybrid 
origin of this plant. 
This is the second hybrid observed in the genus Cornus; the first 
being a cross between Cornus candidissima Marsh. (C. paniculata 
L'Hérit.) and C. obliqua Raf. (C. Purpusi Koehne) described by me 
some years ago as C. Arnoldiana.’ As the second cross is now also in 
cultivation at the Arboretum and will be propagated and distributed, 
it seems advisable to bestow on it a binomial designation and it may 
appropriately bear the name of its discoverer. 
Cornus Slavinii (C. rugosa X stolonifera) n. hybr. Tall shrub of the 
habit and aspect of C. stolonifera but with the stems more strictly 
upright; young branchlets greenish at first but becoming bright purple 
toward the end of the year and marked with dark longitudinal specks, 
remaining purple during the second and third year and furnished with 
small lenticels. Leaves oval or ovate to broadly ovate, acuminate, 
generally rounded at the base, 6-12 em. long and 4 to 7 em. broad, 
dark green above and furnished with scattered hairs, glaucous be- 
neath and more or less villous, the hairs of the leaves of the sterile 
shoots being more appressed, while those of the flowering shoots are 
more spreading and villous particularly on the veins. Inflorescence 
mostly hemispherical with opposite slightly distant branches and a 
distinct central axis, covered with a brownish villous tomentum. 
Flowers appearing about the middle of June, nearly pure white. 
Fruits end of July, subglobose or ovoid, pale blue, bluish white or nearly 
1 Cornus rugosa Lamarck, Encycl. Méth. II. 115. 1786, cf. also III., p. IV. (C. 
circinata L'Héritier, Cornus, 7, tab. 3. 1788). Though almost universally known as 
C. circinata, the application of the rule of priority makes it necessary to give preference 
to the name C, rugosa Lamarck which for some inexplicable reason seems to have been 
entirely overlooked until quite recently. "The same would apply to C. racemosa Lamarck 
(1. c. 116), which has priority over C. paniculata L'Héritier, if C. candidissima Marshall 
(Arb. Am, 35. 1785) is not considered valid on account of its insufficient description, 
2 Cornus Arnoldiana Rehder in Sargent, Trees & Shrubs, I. 79, tab. 40. 1903. There 
can be hardly any doubt that Cornus Purpusi Koehne, figured in Trees & Shrubs I. 77, 
tab. 39, is identical with Cornus obliqua Rafinesque (Western Review I. 228, 1819); 
Rafinesque gives there a detailed description extending over a whole page, while in the 
place usually quoted (Ann. Nat. 13. 1820) the description is much shorter, I am still 
of the opinion that €. obliqua should be considered a species distinct from C. Amomum ; 
its characters being well marked and its geographical range different, Only in New 
England, where the ranges overlap, do intermediate forms occur. 
