152 
CELASTRACES:. 
Celastrus scandens L. Sp. Pl. i, 196 (1753). 
Common near Plummer Ford on the wooded bank of Dismal River, July 3, but 
not seen elsewhere. It is interesting to find this so far from the woody region of 
Nebraska. (No. 1453.) 
RHAMNACEA. 
Ceanothus ovatus Desf. Hist. Arb. ii, 381 (1809). 
It is lower and has thicker leaves than the form collected by me in the Black Hills 
of South Dakota. It is one of the most common woody plants of the region, grow- 
ing on the sand hills. Thedford, June 16 (No. 1325). 
Ceanothus ovatus pubescens Wats. Index, i, 166 (1878). 
This variety is perhaps the most common form of the species in the sand hill 
region. It grades into the typical form, but at the same time there are broad-leafed 
specimens scarcely distinguishable from C. americanus. Perhaps the two are but 
the extreme forms of a variable species. Thedford, June 17 and 20; Plummer Ford, 
July 3; South Dismal River, August 14 (No, 1852). 
VITACES. 
Vitis vulpina L. Sp. Pl. i, 203 (1753). 
The common form in Nebraska has smooth leaves, with a broad sinus. It was 
collected on the banks of the Dismal River, south of Thedford, June 29 (No. 1448), 
Another form with larger and thinner leaves, a narrower sinus, and larger bunches 
of grapes was found at Plummer Ford, July 3 (No, 1466), When young the leaves 
of this form are pubescent beneath. I think it is this form which has been regarded 
by Nebraska collectors as Vitis cordifolia. ‘The latter is distinguished by a different 
dentation of the leaves, which are scarcely ever lobed, by a narrow and acute sinus, 
and by more elongated clusters. It does not appear to grow in Nebraska. 
Parthenocissus quinquefolia (L.) Planch. in DC. Monogr, Phan. vy, pt. 2, 448 
(1887); Hedera quinquefolia LL. Sp. Pl. i, 202 (1753), 
Banks of Middle Loup River, near Natick, June 20 (No, 1375), 
ACERACE. 
Acer negundo L. Sp. Pl. ii, 1056 (1753). 
Few large or even middle-sized trees were found, Here and there on the hillsides 
near the rivers: Norway, June 22; Plummer Ford, July 3 (No. 1406), 
ANACARDIACES. 
Rhus glabra L. Sp. Pl. i, 265 (1753). 
Not common. Banks of Dismal River, June 28; Plummer Ford, August 22 (No, 
1443). 
Rhus trilobata Nutt.; Torr. & Gr. Fl. i, 219 (1838). 
Local on the hills near the rivers: Norway, June 22; Dismai River, June 29; Forks 
of Dismal River, July 11 (No. 1407). 
Rhus radicans toxicodendron (L.) Pers. Syn. i, 325 (1805); Rhus toxicodendron L. 
Sp. Pl. i, 266 (1753). 
I believe that the western form of the “ poison ivy” has good right to a varietal 
name. It is always an upright, strict shrub, 0.3 to 1m. high, never climbing and 
without aerial rootlets. These characters are not seen in herbarium specimens, 
which mostly consist of a short piece of the top of the plant. In eastern Nebraska, 
the true Rhus radicans' is not uncommon in the woods. It is always tall, climbing by 
IL. Sp. PL. i, 266 (1753). 
