LABIATAE 277 



Lepidoptera. Schuiz, 2 humble-bees — Bombus mastrucatus Gerst., and B. terrester 

 L., skg. and also perforating the flowers. 



714. Rosmarinus L. 



2292. R. officinalis L. — Delpino (' Ult. oss,') describes this species as 

 protandrous. In the second stage of anthesis the stigma assumes the position 

 occupied in the first by the anthers. 



Visitors. — The following were recorded by the observers, and for the localities 

 stated. — 



Friese, Hungary (H.) and Fiume (P.), 3 bees — i. Eucera caspica Mor. (H., F.); 

 2. Megachile manicata Gir. (H., F.); 3. Xylocopa cyanescens .ff/-«///(H.). Schletterer, 

 Pola and the Tyrol (T.), a wasp (Polistes gallica Z.) and 17 bees — i. Andrena 

 carbonaria L. ; 2. A. fiavipes Pz. ; 3. Bombus argillaceus Scop., skg. ; 4. B. 

 pascuorum Scop. (T.); 5. B. terrester Z. ; 6. Halictus leucozonius ScAr. 5; 

 7. H. levigatus .&'.$; 8. H. malachurus li.; 9. H. scabiosae Hossi; 10. H. 

 xanthopus K., one 5; 11. Megachile manicata Gir. ; 12. Nomada lineola Pz., 

 var. subcornuta A'.; 13. N. sexfasciata Pz.; 14. N. succincta Pz. ; 15. Osmia 

 rufa Z. ; 16. Podalirius acervorum Z. ; 17. P. crinipes Sm. 



715. Hyssopus L. 



Protandrous bee flowers ; with nectar secreted (according to Sprengel) by the 

 base of the ovary. 



2293. H. officinalis L. (Sprengel, ' Entd. Geh.,' p. 301 ; Kirchner, ' Beitrage,' 

 PP- 55-6 ; Knuth, ' Bloemenbiol. Bijdragen.') — In this species the tube of the deep 

 blue, rarely white corolla is 10 mm. long, its lower half forming a thin, hollow 

 cylinder directed obliquely upwards. In the middle it curves slightly downwards 

 and widens out funnel-wise. Below this curve the lower part of the corolla is 

 indented by two longitudinal folds, rendering the cylinder still narrower, and the 

 access to the base of the flower very small. At first only the somewhat divergent 

 stamens project (the upper ones for 3 mm. and the lower for 6 mm.) beyond the 

 broad corolla-limb, exposing pollen. When the anthers have dehisced the style, 

 which has so far scarcely projected beyond the upper lip, elongates to such an 

 extent that the now diverging stigmatic branches dominate the entrance to the 

 flower. Cross-pollination is therefore ensured by the visits of suitable insects. 

 Automatic self-pollination is not easily effected, even when pollen-grains still cling 

 to the shrivelled anthers. 



Kirchner could not find female flowers. 



Visitors. — The following were recorded by the observers, and for the localities 

 stated.— 



Kerner, the honey-bee. Knuth (Kiel Botanic Garden), 2 humble-bees — 

 Bombus lapidarius Z. S, and B. terrester Z. 5. The former sucked persistently, so 

 that nectar would appear to be present, though J was unable to detect it either with 

 a lens or by means of the sense of taste. 



