390 Ulmaceae Ulmus 



ridges. I found it in Point Township of Posey County on a very low ridge 

 in a pin oak woods. It was local here; there were only a few trees and 

 it was associated with post oak. It is usually associated with black and 

 post oaks. 



N. Y. to Nebr., southw. to Fla. and Tex. 



X Queicus Biishii Sarg. This is a hybrid between Quercus marilandica 

 and Qua reus velutina. I found a single tree on a sandy ridge on the farm 

 of Frank Plass about 2 miles north of Decker or just northwest of the 

 Vollmer Siding of the Chicago & Eastern Illinois Railroad in Knox County. 

 Seed of this tree were generously distributed in 1933 to the larger 

 arboretums of the United States. 



63. ULMACEAE Mirbel Elm Family 



Branchlets with solid pith; leaves with parallel primary veins; flowers borne on the 

 branchlets of the preceding year 1896. Ulmus, p. 390 



Branchlets with chambered pith; leaves 3-veined at the base; flowers borne on the 

 branchlets of the year 1898. Celtis, p. 392. 



1896. ULMUS [Tourn.] L. Elm 



Inner bark mucilaginous; upper surface of the leaves very scabrous to the touch, 



usually densely covered with stiff, more or less erect hairs arising from large, 



whitish, hollow, papillose bases; branchlets densely gray -pubescent, generally 



becoming brownish at maturity; bud scales more or less pubescent and ciliate with 



rufous hairs; flowers nearly sessile; calyx densely ciliate with rufous hairs; 



samaras mostly suborbicular, 13-19 mm long, both sides of the body densely 



woolly-pubescent, the wings nearly glabrous, the margins glabrous. . . .1. U. fulva. 



Inner bark not mucilaginous; leaves glabrous or somewhat scabrous above; flowers on 



slender, jointed pedicels; samaras ciliate or pubescent all over. 



One and two year old branches (at least some of them) with one or both sides covered 



more or less with a corky excrescence; samaras pubescent all over. 



Buds ovate, not twice as long as wide, obtuse or short-pointed, dark brown; bud 



scales pubescent and ciliate; leaves large, 8-15 cm long, not twice as long as 



wide, glabrous above except along the midrib; calyx lobes 7-9, not ciliate; 



samaras oval, 1.5-2 cm long 2. U. racemosa. 



Buds small, narrow, twice as long as w T ide, light brown, very sharply pointed; 

 bud scales glabrous or merely puberulent; leaves narrow, the blades 4-8 cm 

 long, twice as long as wide, glabrous or more or less scabrous above; calyx 



lobes 5, not ciliate; samaras oval, the oval part 6-10 mm long 3. U. alata. 



One and two year old branches without corky wings; branchlets ashy gray, pubes- 

 cent or glabrate, at maturity becoming light brown and glabrous or remaining 

 pubescent; leaves more or less appressed-pubescent above (at least near the 

 margins and the base), rarely entirely glabrous when observed under a lens, 

 often smooth to the touch but the surface usually covered with short, appressed 

 hairs, sometimes more or less scabrous but the hairs usually without the large, 

 white, papillose bases, rarely a few hairs with such but not distributed over the 

 entire surface as in no. 1; calyx not ciliate; samaras oval, about 10 mm long, 

 both sides glabrous, the margins ciliate 4. U. americana. 



1. Ulmus fulva Michx. Slippery Elm. Map 798. This species is found 

 in every county of the state. It is rare to infrequent in a few of our 

 prairie counties but frequent to common in all parts of the state out- 

 side of the oak-hickory forests and in wet woodland. Where woodland has 



