152 JOURNAL OF THE ARNOLD ARBORETUM [vol. u 



Fraxinus profunda Bush. A common and cliaractcristir troc in the 

 swamps of the Cairo Formation, and extending up tlie Wal)ash Vulloy 

 at least as far north as Richland and Wabash Counties. 



Fraxinus hiUmorcana Beadle. Grows along bluffs and .^teep hillsides 

 in the Mounds and Ozark Ridge Formations; nowhere common. 



Fraxinus pennstjlvanica ^larsh. Not unconmion throughout tlie re- 

 gion, in low woods and along streams. 



Fraxinus pennsyhanica var. lanccolafa (Borkh.) Sarg. Rather com- 

 mon throughout the region in low and swampy woods and on borders 

 of streams. 



Foresticra acuminata Poir. Often abundant in swamps and li)w woods 

 of the Cairo Formation, and extending north into the Wabash Valley. 



Cafalpa spcciosa Warder. Formerly ratlier abundant in the Ohio and 

 Wabash valleys. Much sought for post timber, and becoming scarce. 

 Noted in White and Ricldand Counties. 



Biijnonia radicans L. Occasional on open banks and along railway 

 grades in all parts of the region. 



Anisosfirhus caprcolata (L.) Bur. Fouiul only in tlie lowlands of the 

 Cairo Formation, where it grows sparingly in woods and along open banks 

 of streams. 



Cephalanthus occidcntalis L. In swamps and along margins of lakes 

 and streams throughout the region. Most common in the deep swamps 

 of the Cairo Formation, where it is often the commonest shrub. 



Symphoricarpos orhiculatus Moench. Found in all parts of tlie region, 

 but nowhere very common. 



Viburnum dentaium L. Scarcely enters the region covered by this 

 report, but a few specimens were seen in Richland County, wliere it ha<l 

 previously been collected by Dr. Ridgway. 



Viburnum prunifollum L. Occasionally found along small streams in 

 the Ozark Ridge region and northward in the Walnish valley. 



Viburnum rufululum Raf. Found in open woods on the higher bot- 

 toms of the Cairo Formation and on uplands of the Mounds Formation. 

 Very abundant in rlcli wooded bottoms of the Mississii)pi River, near 

 East Cape Girardeau, Alexander County. Not seen in the Ozark Ridge 

 region, but reappearing in the low hills near Shawneetown, Gallatin 

 County, 



Sambucus canadensis L. Often abundant in low woods and open 

 ground tliroughout the region. 



/ 



Confined to the l(»wlands of 



the Cairo Formation and low bottoms along the larger streams nortli- 

 ward. Ulmus alafa and U. americana are nearly always the host plants 

 upon which it grows here, but in a few cases it was seen on Glcditsia 

 triacanthos and Nyssa sylvatica. 



In addition to the species listed above a few other advenlivi; or es- 

 caped woody plants were seen growing in different parts of the region. 

 Amongst these were Paulownia tomentosa (Thunb.) Steud., abundant 



