Descriptions of Plates. 



Plate I. — Polygonum rigididmn Sheld. 



1. Emergent part of plant. 



2. Submerged part of plant. 



Plate II. — Aster longulus Sheld. 



1. General aspect. 



2. Flower. 



3. Achene. 



4. Hairs from stem. 



Plate 111.— Hairs of Cypripedium. 



1. Glandular tipped hair of C. spectabile. 



2. Pointed hair of C. spectabile. 



3. Glandular hair of C. pubescens. 



4. Pointed hair of C. pubescens. 



