Notes on Pollen. Bij Lor J Arebnri/. 



49^ 



Name of Plant 



Approxi- 

 mate 

 Lena;th 



of Pollen 

 in mm. 



TYPHACEiE. 



Length 

 of Pistil 

 in mm. 



Name of Plant 



Sparganiinn ramosnm 

 Sparganium simplex . 



Appro.vi- Approxi- 

 mate mate 

 Size of Length 

 Pollen of Pistil 



003 

 •03 



6 

 5 



Cyperace.e. 



Eriophorum angusti folium -OS 

 Scirpjts lacustris . . . . '035 



t 

 5 



Zea Japonica 

 Alopccurus pratensis 

 Arrhenatheriun elatiu 

 Phalaris arundinacea 

 Hordeum nodosum 

 Elymus giganteus 

 Avena saliva 

 A . brcvis 

 Brachypodium sylvaticum 

 Gynerium kermesina . . 



Butovuis umbellafns 



•025 

 •030 



Davtasonium alisma . 



•023 



•025 



1^2 

 1-75 



1 

 17 



Naidace^. 



Potamogeton natans . . 

 Triglochin marilimum 



•03 

 •025 



1-5 



1-75 



It is I think impossible to glance down this table without being 

 convinced that there is a distinct relation between the size of the 

 pollen and the length of the pistil. 



Til is correlation between the size of the pollen and the length 

 of the pistil is especially evident when nearly allied species are 

 compared. Thus the pistil of Clematis vitalha is 6 • 7 mm. in length 

 and the pollen 0-021-0 -026 long by 0-016-0 "02 in width ; while 

 the pistil of C. orientalis is 9*5-10 mm. long and the pollen 0-02- 

 0-03 mm. long and 0-02-0-024 wide. The pistil of Thalictrum 

 mm us is 1 - 75 long and the heniispheroid or disk-like pollen • 016- 

 0-024 mm. in diameter when dry; while the pistil of T. jiavum is 

 2-2-25 long and the pollen 0-02-0-03 in diameter opened out. 

 The pistil of Aquilegia vulgaris is 1 c. 3 • 5 mm. long and the pollen 

 0-022-0 -03 long and 0-016-0-02 wide; while the pistil of A. 

 chrysantha is 2 cm. long and its pollen 0-026-0 "032 long and 

 0-616-0 -02 wide. 



