169 
This has been regarded as a distinct species under the name of Fraxinus viridis Mx., 
but seems not to be different from the preceding except in the lack of the pubes- 
cence on the young shoots. Both are found here and there on the hillsides, but no 
large trees were seen. Seneca, September 9; Dismal River, July 3 (No. 1391). A few 
young trees were found on the South Dismal River, that had very large leaflets. 
APOCYNACE. 
Apocynum cannabinum L. Sp. Pl. i, 213 (1753). 
The specimens from Thedford and Natick are low and with smaller leaves than 
usual. Thedford, June 17; Natick, June 20; Norway, June 22; northeast of Whit- 
man, August 1 (No. 1353). 
ASCLEPIADACES. 
Asclepias incarnata L. Sp. PI. i, 215 (1753), 
Common in the meadows: Forks of Dismal River, July 11; Middle Loup, Mullen, 
July 17; South Dismal River, August 14; Thedford, September 7 (No. 1518). 
Asclepias speciosa Torr. Ann. Lyc. N. Y. ii, 218 (1854). 
Throughout the region, but local. Railroad embankments, Thedford, June 21; 
Dismal River, June 28 and 29 (No. 1383). 
Asclepias syriaca L. Sp. Pl. ed. 2, i, 313 (1762). 
Rare: Forks of Dismal River, July 12; Middle Loup River, Mullen, July 19 (No. 
1532). 
Asclepias arenaria Torr. Bot. Mex. Bound. 162 (1859), 
This is very common in the sand hills around Dismal River, but only a few speci- 
mens in bloom were secured. Plummer Ford, July 5; South Dismal River, August 14 
(No. 1500). 
Asclepias verticillata pumila Gray, Proc. Amer. Acad. xii, 71 (1876). 
In a prairie-dog town, Thedford, August 9 (No. 1700). 
Acerates angustifolia (Nutt.) Dec. in DC. Prodr. viii, 522 (1844); Polyotus angusti- 
folius Nutt. Trans. Amer. Phil. Soc. ser. 2, v, 201 (1833-37). 
Mr. J. M. Holzinger unites <Asclepias stenophylla with Acerates auriculata, In 
Nebraska they seem to be different in certain points. Aselepias stenophylla Gray, 
which is the same as Acerates angustifolia (Nutt.) DC., usually has several stems from 
each root; these stems are more or less ascending and more or less hairy or pruinose; 
the divisions of the hood are yellowish-white and narrow. In Acerates auriculata 
the stem is single from the root, perfectly smooth and even, with a bloom; the divi- 
sions of the hood orange-yellow and broad. Evidently they are very nearly related 
and they perhaps grade into each other, though IT have not found them to do so in 
Nebraska, They should, however, belong to the same genus, and to Acerates rather 
than to Asclepias. Accrates auriculata grows on the table-land; A. angustifolia in the 
sand hills. This may account for the difference. Norway, June 23; Plummer Ford, 
July 3 to 6 (No. 1420). 
Acerates languinosa (Nutt.) Dec. in DC. Prodr. viii, 523 (1844); Aselepias lanugi- 
nosa Nutt. Gen. i, 168 (1818). 
Sand hills, Thedford, June 16,17, and 19 (No. 1326). 
Acerates viridiflora (Raf.) El. Bot. 8. Car. & Georg. 317 (1823) 53! Aselepias viridi- 
Jlora Raf, Med. Rep. xi, 360 (1808). 
Very variable. Generally two varieties have been acknowledged, but they grade 
into the typical form and into each other. They should be regarded as forms rather 
than varieties. The typical form was collected at Norway, June 22 (No, 1424), The 
'The name is not given by Elliott, but he suggests that this species also may be 
included in Acerates. 
