Cassiope hypnoides.............. p. 105 
Th bol NT UT ree ote ee ts p. 101 
Chimophila umbellata............ Den 287 
Detim pause eee te + os, hs pe yon 
Loiseleuria procumbens .......... p. 96 
Lyonia calyeulata. ......2....... p. 110 
(Oxycoccos palustris) -........... p. 118 
Thyliodoce cocrulea.... +> =. sue 00 
Pirola GE ANA] LOT. 2.2... LR à p. 80 
u WIRENOT EEE SE RER ide wi: p. 83 
—  rotundifolia.............. p. 80 
Seni On NICE SE ee p. 86 
SY SCCUNDA Se Sa see ste ee p. 84 
Rhododendron lapponicum........ P- S9 
Vaccintum Myrtillus 2... we ee p. 127 
Vaccinium: Oxycoccost.c8 3... Sat: - p. 118 
— wliginosum®... ANSE ES. p. 123 
- PAS ES TEN ee. p. 121 
Anatomical deseription of the different species. 
Pirolacew. 
Pirola grandiflora Rad. 
Syn. Pirola rotundifolia v. grandiflora DC. 
Warning, 1885, p.16. Srenstrom, 1895, p. 137 (cf. fig.) 
Material examined from: — West Greenland: tent 16 (Ryder); 
Sarfanguak; Godhavn; Upernivik; Kangerdluarsuk. East Green- 
land: Cape Stewart. 
The leaf (Fig. 1). The outer walls of the epidermis are 
fairly thick, cuticularized beneath the cuticle, and thickened 
especially on the upper surface of the leaf. Lateral walls undul- 
ating, irregularly thickened, furnished with numerous pores. 
Hairs are absent. Stomata are confined to the lower surface; 
they project slightly. The epidermis of the lower surface 
contains chlorophyll grains. Distinct palisade-tissue does not 
occur; in form, the upper cells of the mesophyll correspond 
