ULMACEAE. — ULMUS 261 



A typo praecipue recedit ramulis etiam novellis glabris, foliis supeme plus 

 minusve nitentibus glabris levibus subtus tantum in axillis nervorum pro parte 

 barbulatis basi saepe distinctius asymmetricis tenuioribus, petiolis minus puberulis, 

 fructibus ghiberrimis. 



NORTHEASTERN ASIA. Northern Korea: " fluvium Jalu super, vallis 

 Samsumuris," July 6, 1897, V. Komarov (type; with some small fruits and almost 

 fully grown leaves). Saghalien: Konuma, moorlands, not common, August 4, 

 1914, E. H. Wilson (No. 7325; tree 13 m. tall, girth 3 m., round-headed; sterile). 

 Ussuri: near Vladivostok, by streams in low moist ground, August 18, 1903, C. 

 S. Sargent (sterile) ; Khabarovsk, August 23 and 27, 1903, C. S. Sargent (small tree, 

 leaves very lustrous; sterile, folia maxima obovato-oblonga ad 15: 7 cm. magna). 

 Amur : " ad fl. Amur", 1855, R. Maack (Nos. 113, with flowers; 379, sterile branch 

 with corky wings); " Amur superior et medius," August 26, 1891, S. Korshinsky 

 (sterile branch with corky wings). Mandshuria: mountains, 12 hours east of 

 Harbin, August 31, 1903, C. S. Sargent (sterile, branches partly corky). 



This is a well-marked variety which like the type has a form with corky winged 

 branches. On dry sunny places the color of the branches seems to be more dis- 

 tinctly reddish. It is difficult to determine any shrubby form of Ulmus growing in 

 dry stony situations; the leaves of plants in such positions become mostly much 

 smaller and very rough on both surfaces. See also my remarks under U. macrocarpa 

 Hance (p. 252) and the following species. Such shrubby small-leaved forms very 

 often are taken for U. pumila Linnaeus. 



Here may be mentioned a sterile specimen collected by F. N. Meyer in Shansi, 

 near Tsin-tse, May 1907 (No. 416), of which the small leaves in shape and pubes- 

 cence resemble those of U. japonica, but the length of the petioles is about one 

 third of the length of the whole leaf except the elongated tip. This curious form 

 needs further observation. 



In Saghalien U. japonica, var. levigata Schneider is a rather low and broad- 

 topped tree and it is not very common. A picture will be found under No. x365 of 

 the collection of my Japanese photographs. E. H. W. 



13. Ulmus Davidiana Planchon in Compt. Rend. Acad. Sci. Paris, LXXIV. pt. 

 1, 1498 (nomen nudum) (1872); in De Candolle, Prodr. XVII. 158 (1873). — Maxi- 

 mowicz in Bull. Acad. Sci. St. Petersbourg, XVIII. 291 (1873); in Mel. Biol. IX. 24 

 (1873). — Franchet in Nouv. Arch. Mus. Paris, ser. 2, VII. 76, t. 8, fig. B {PL 

 David. I. 266) (1884). — Hemsley in Jour. Linn. Soc. XXVI. 447 (1894).— 

 Schneider, III. Handb. Laubholzk. II. 904, fig. 565 i, 566 i (1912). 



CHINA. Chili : Jehol, A. David (No. 1716, type ex Planchon); same locahty, 

 December 11, 1907, F. N. Meyer (No. 201; according to Meyer's note in Bull. U. S. 

 Dept. Agric. Bur. PI. Indust. No. 137, 25, no. 21932 [1909], "an Elm growing to be 

 a medium-sized tree with a round, spread-out head; when young has two corky 

 wings along its young branches; is not a common tree at all. Grows in very dry 

 and exposed localities." Plants distributed by the Department of Agriculture as 

 U. Davidiana, cultivated in the Arnold Arboretum under No. 5927); south of 

 Wcichang, 1910, W. Purdom (No. 262; apparently the same as a plant growing in 

 the Arnold Arboretum received as Purdom No. 261 from Hort. Veitch in 1912). 



This is a very little known species of which I have seen only a fruit and a young 

 leaf of the type kindly sent to the Arboretum by the Director of the botanical 

 department of the Museum in Paris. U. Davidiana is certainly nearly related to the 

 preceding species. The leaves of the sterile specimens mentioned above are more 

 glabrous and more broadly or roundish obovate than those of U. japonica, of 

 which the leaves are mostly more cuneate towards the base. The length of the peti- 

 ole and the number of the lateral nerves seem to be variable, and the color of the 



