42 JOURNAL OF THE ARNOLD ARBORETIM [vol. in 



Three plants of this distinct and handsome form were found in the 

 woods near Wolfeboro, New Hampshire and transplanted to the grounds 

 of Mrs. George A. Carpenter. They are now approximately 20 to 25 

 years old and 5^ to 8 feet tall forming dense globose heads about %y 2 

 feet in diameter. The leaves are as or nearly as long as in the typical 

 form but slenderer. It has not yet produced cones. 



This is the first variation known of P. resinosa Sol. and therefore of 

 interest. Young plants grafted from the original plants are growing at 

 this Arboretum. 



Ulmus americana L. f. columnaris f. nov. 



A typo recedit ramis ercctis columnam satis angustam formantibus. — 

 Ramuli juveniles pubescentes; folia elliptica, 7-14 cm. longa 4-7.5 cm. 

 lata, basi valde obliqua, dupliciter argute serrata supra adpresse scabro- 

 pilosa, subtus secus costam et in venis venulisque pilosa; petioli pubes- 

 centes, 2-3 mm. longi. 



New York: Conesus Lake, Livingston County; specimens collected June 10, 

 1911, by R. E. Horsey and T. Malloy and photographs taken by R. E. Horsey 

 at the same date and earlier in a nearly leafless state state are preserved in the 

 herbarium and in the photograph colleetion of the Arnold Arboretum. 



This very distinct columnar form of the American Elm was discovered 

 by Mr. John Dunbar; the tree is standing inside a garden wall near the 

 roadside and is about 20 m. tall with a columnar crown about 6 m. in 

 diameter, of almost equal width from the base to the top which is flat- 

 tened, ending in many branches of nearly equal height; the trunk meas- 

 ures 0.75 m. near the base and divides somewhat below the middle 

 into several strong limbs ascending at a very acute angles. The leaves 



differ from those of the common form in being rather broad, measur- 

 ing up to 7.5 cm. in width, very sharply and deeply doubly serrate, sca- 

 brous above, pilose on the veins and veinlets beneath and very unequal 

 at the base; the petioles are very short, not exceeding 3 mm. in length 

 and the young branch lets are pubescent. 



Another tree of nearly similar habit is growing in Seneca Park, Rochester, 

 New York, of which a photograph taken by R. E. Horsey on September 

 1, 1930, is in the collection of the Arnold Arboretum. 



There is no earlier record, as far as I know, in botanical or horticultural 

 literature of a columnar form of the American Elm, while the pendulous 

 form was distinguished as early as 1789 by Aiton as U. americana var. 

 pendvla. 



Aristolochia durior Hill, Twenty-five New PL 9, t. 24 (1773). — Reh- 

 der, Bradley Bibliog. n. 182 (1912). — A. macrophylla Lamarck, Encycl. 

 Meth. i. 255 (1783). —A. Sipho L'Heritier, Stirp. Nov. 13, t. 7, 7b (1784 

 (17851). 



Hill's name for the plant now generally known as Aristolochia macro- 

 phylla Lamark seems to have entirely escaped notice; it does not appear 

 in Index Kewensis and no mention of it can be found in literature else- 

 where until I enumerated it in the Uradley Bibliography in 1912. As 



