ROSACEAE 375 



895. P. hirta Vill — 



Visitors. — Schletterer observed the following Hymenoptera at Pola. — 



{a) Apidae: i. Andrena lucens /toA. ; 2. A. thoracica Z'. ; 3. Halictus fasciatellus 



Schenck; 4. H. villosulus K.; 5. Prosopis clypearis Schenck. (I)) 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: i. 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. 5, 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. Miiller, ' 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 ^ ^ „.,, ,^. 



^ _ * _ Fig. 116. Stbbaldta procumbens, L. 



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



, J ,Tr • 1 ^T- . ^ .. r directly from above { X 7). a anther : ak. 



lands. Warming makes the same statement for epicaiyx; *, sepal; «, nectary; a petal. 

 Greenland. 



253. Alchemilla L. 



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

 ring 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. PI.,' Eng. Ed. i, 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 



