ROSACEAE 375 



895. P. hirta Vill. 



Visitors. Schletterer observed the following Hymenoptera at Pola. 



(a) Apidae: 1. Andrena lucens Imh. ; 2. A. thoracica F. ; 3. Halictus fasciatellus 



Schenck; 4. H. villosulus K. ; 5. Prosopis clypearis Schenck. {&) Tenthredinidae : 



6. Amasis laeta F. 



896. P. delphinensis Gren. et Godr., and 897. P. Kurdica Boiss. et 

 Hohen. 



Visitors. Loew saw Apis, skg. and po-cltg., in the Berlin Botanic Garden. 



898. P. chrysantha Trevir. 



Visitors. Loew observed the following in the Berlin Botanic Garden. 

 A. Diptera. Syrphidae: 1. Eristalis nemorum Z.; 2. Syritta pipiens Z., 

 po-dvg. B. Hymenoptera. Apidae : 3. Apis mellifica Z. 5, skg. and po-cltg. 



899. P. Meyeri Boiss., var. Fenzlii Lehm. 



Visitors. Loew saw the bee Prosopis communis Nyl. $>, po-dvg., in the Berlin 

 Botanic Garden. 



252. Sibbaldia L. 



Homogamous greenish-yellow flowers, with exposed nectar secreted in the 

 usual place. 



900. S. procumbens L. (Herm. Muller, ' Alpenblumen,' p. 222.) In this 

 species the exposed nectar is secreted by the 



broad fleshy disk which surrounds the ten carpels. 

 It is eagerly visited by short-tongued insects 

 ^Muscids, ants, Ichneumonids), and these effect 

 cross- and self-pollination. The possibility of 

 automatic self-pollination seems to be excluded, 

 for though the anthers mature simultaneously 

 with the stigmas, they are so far from them 

 that transfer of pollen cannot take place auto- 

 gamously. Lindman, however, says that self- 

 pollination is a much easier matter in plants of Fjg n6 Sibbaldia procumbens ^ L , 

 the species growing in the Scandinavian High- (after Herm. Mailer). Flower seen 



, , TT , .11 c directly from above (x 7). a, anther ; ak. 



lands. Warming makes the same statement for ep icaiyx ; k, sepal ; , nectary ; />, petal. 

 Greenland. 



253. Alchemilla L. 



Small, greenish apetalous flowers; with exposed nectar secreted by a fleshy 

 rmg on the inner wall of the receptacle. 



901. A. vulgaris L. (Herm. Muller, 'Fertilisation,' pp. 234-5; Lindman, 

 ' Bidrag till Kanned. om Skandin. Fjellvaxt. Blomn. o. Befrukt.' ; Schulz, ' Beitrage,' II, 

 p. 188; Kerner,'Nat. Hist. PL,' Eng. Ed. 1, II ; Loew, ' Blutenbiol. Floristik,' p. 396.) 

 Schulz states that this species is very commonly gynomonoecious and gynodioecious, 

 as well as andromonoecious and androdioecious ; and that in some districts herma- 

 phrodite flowers are entirely absent. According to Hermann Muller, the fleshy yellow 

 ring on the inner side of the receptacle, which surrounds the style at the time of 



