study the plants in the field, or at least to carry out my investi- 

 gations on living material found growing in the open, and to make 

 accompanying pencil sketches; afterwards I drew the published figures 

 from spirit-material, but with continual reference to the notes and 

 sketches made from the living material. In most cases I have 

 investigated the biology of the flowers in their natural habitats. 



Almost all the figures have been drawn by myself; this apphes 

 more particularly to the flower-biology figures : a few only of the 

 morphological figures have been drawn by others, under my super- 

 vision. 



This first paper on the morphology of the Ericineae and 

 the structure of their flowers will be followed by a second, on 

 their anatomy, by Mr. Henning E. Petersen, Mag. Sc. 



Copenhagen, December, 1907. 



The species mentioned in the following pages are : - 



Andromeda polifoUa p. 29 



Arctostaphylos alpina p. 34 



— XJva-ursi p. 39 



{Bryanthus coeruleus p. 17) 



{Cassandra calyculata p. 32) 



Cassiope hypnoides p. 22 



— tetragona p. 25 



Ledum palustre p. 6 



Loiseleuria procumbens p. 13 



Lyonia calyculata p. 32 



Phyllodoce cœruleœ p. 17 



Pirola minor p, 62 



— uniflora p. 63 



— rotundifolia p. 56 



— secunda p. 62 



Rhododendron lapponicum p. 10 



Vaccinium Myrtillus p, 42 



— Oxycoccos p. 53 



— uliginosum p. 45 



— Vitis-idœa p. 49 



