390 Fr. J. Mathiesen. 



live for several years, and can have growth in thickness; 

 adventitious roots are developed but sparingly. The shoots 

 are erect and hairy especially above in the floral part; if 

 they are capable of flowering — which ordinarily appears to 

 be the rule — they terminate in a raceme, the subtending 

 leaves of which are large, the lower ones similar to the foliage- 

 leaves, but often having long lobes. 



In the axils of the 4 — 7 radical scale-leaves (bud-scales) 

 of the shoots "innovation-buds" occur, but of these only 

 1 — 2 are further developed; the uppermost of them appear 

 on the whole to be the most vigorous, but none of them is 

 a decidedly principal bud. The foliage-leaves differ greatly 

 in shape and size in the different forms in which the plant 

 occurs ; in var. unalaschkensis they are large, ovate-lanceolate 

 (50 — 60 mm long, as much as 17 mm broad); in var. septen- 

 trionalis they are smaller, linear-lanceolate 30 — 40 mm long, 

 3 — 4mm broad); the principal form is intermediate. Fruits 

 with ripe seeds occurred in my material from the locali- 

 ties in Labrador and Hudson Bay; the fruit ripens in July — 

 August. The seeds are small and light with a reticulated, 

 pitted testa; this pattern is produced by the very thin outer 

 walls of the outermost, large-celled layer of the seed-coat, 

 sinking down into the cavity of each cell, while to the inner 

 and lateral walls rigidity is given by a network of anasto- 

 mosing flange-like thickenings. 



The structure and biology of the flower has been ex- 

 haustively described by E. Warming, (1. c), from whom 1 

 quote the following (compare also the accompanying figure 

 with explanation which has been taken from the paper in 

 question): "The hairy calyx is deeply cleft into two lateral 

 lobes, which again are cleft into a larger anterior and a 

 smaller posterior lobe, both oblong. Here the corolla is only 

 of about the length of the calyx, tube-shaped and two-lip- 



