Apr., I92I] TRELEASE — NORTH AMERICAN PIPERS 217 
Plate VII 
Fig. I. Piper Neesianum (Liebmann i8). 
Fig. 2. Piper Mas, the type collection. 
Plate VIII 
Fig. I. Piper ahalienatum, the type collection. 
Fig. 2. Piper albicaule, the type collection. 
