316 Eue Warming. 



The figures show also that they vary in length (the styles 

 of a 2 are for instance much longer than those of F and h z ). 



The ovary characters also appear to be fairly normal; 

 the ovules are large, perfectly formed (Fig. 37, F) and curved, 

 the integuments are formed, even the long hairs which serve 

 to guide the pollen-tubes are there, but the nucellus appears 

 to be more or less shrunken, and on closer inspection the whole 

 conveys the impression of being abnormal. The ovules are 

 not everywhere abortive to the same extent, even in the same 

 ovary they may be found to vary in size, and in some cases 

 I must even assume that the ovules had been quite normal, 

 but fruit-setting was nevertheless impossible, because the 

 stigmatic papillæ were so undeveloped (/*). All these 

 flowers die also without setting fruit, and in such withered 

 and closed flowers the size and position of the ovary and the 

 styles is found to be unaltered. 



Near Altenfjord (Norway) I gathered unusually large 

 o flowers (Fig. 37, G): in one 6-merous flower the diameter 

 of the calyx was about 16 mm, and the length of the petals 

 5 mm. As regards other features see Fig. g 1 , g 2 . I have gathered 

 unusually small o flowers, for instance on Sjælland: diameter 

 only 6 mm, petals 3 — 3 1 / 2 mm, cal.-st. 5 and cor.-st. 4 mm. 

 In the latter locality the small-flowered plant was growing 

 about 15 degrees south of the large-flowered one. 



?: S flowers with a few rudimentary stamens occur, but 

 they seem to be rare. Purely $ flowers are common. Here also 

 the flowers vary considerably in size and in the relative length 

 of their different parts, but on the whole the ? are < £ (com- 

 pare Fig. h z with /; as also K and L with o uppermost in 

 the plate: A — D). The diameter of the calyx is for instance 

 7 — 9 mm and that of the corolla about 5 mm, and the petals 

 in particular are always very small, usually only 1 to 2 mm 

 long (see Fig. i 1 , A; 1 , I 1 ). The same figures show their length 



