304 ANGIOSPERMAE—DICOTYLEDONES 



2356. M. candidissimum L. — 



Visitors. — Schletterer observed the following 16 bees at Pola. — 



I. Anthidium diadema Lir.; 2. A. septemdentatum Lir.; 3. Andrena carbona- 

 ria Z. ; 4. Bombus argillaceus Scop. ; 5. B. terrester Z. ; 6. Coelioxys aurolimbata 

 Forst.; 7. Eucera hispana Zif/i. ; 8. Halictus patellatus Jl/or. ; 9. H. quadricinctus 

 F.; 10. H. sexcinctus F.\ 11. Megachile lefeburei Lep.; 12. M. maritima K.; 

 13. M. muraria Retz.; 14. M. sericans Fonsc; 15. 0smia fulviventris Pz.; 16. 

 Xylocopa violacea L. 



2357. M. anisodon C. Koch. (=:M. vujgare Z., according to the Index 

 Kewensis). — 



Visitors. — Loew observed the humble-bee Bombus terrester Z. $, skg., in the 

 Berlin Botanic Garden. 



2358. M. propinquum Fisch. et Mey. — 



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

 stated. — 



Loew (Berlin Botanic Garden), 2 bees, skg. — Apis mellifica Z. 5, and Anthidium 

 manicatum Z. 5. Mocsary (Hungary, teste Friese), the rare bee Coelioxys poly- 

 centris Fdrst. 



2359. M. peregrinum L. ( = M. creticum Mill.) (Schulz, 'Beitrage,' I, p. 85.) 

 — The flowers of this species are feebly protandrous. The corolla is 5-52 mm. 

 long, and its tube is lined with hairs from the entrance to within about 2 mm. from 

 the base. 



The anthers lie immediately behind the opening of the flower, almost filling it, 

 so that the inserted proboscis of an insect must always brush them. The style does 

 not elongate and unfold its two branches until dehiscence is almost at an end, but 

 continues to grow even when the flower begins to fade, sometimes reaching a length 

 of 4 mm. As the stigma grows through the anthers, automatic self-pollination 

 usually takes place. 



729. Physostegia Benth. 



Protandrous, with opposite movement of the stamens and style. (Delpino, 

 'Ult. oss.,' p. 148.) 



2360. P. virginiana Benth. (Delpino, loc. cit.) — The external anther-valves 

 possess marginal teeth, which assist visitors to empty the pollen completely. 



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



A. Hymenoptera. Apidae: i. Bombus agrorum F. S, trying to suck; 

 2. Halictus cylindricus F. 5, creeping far into the flowers; 3. Prosopis communis 

 Nyl. 5, creeping into the flowers. B. Lepidoptera. Rhopalocera: 4. Pieris 

 brassicae Z., skg. 



730. Ballota L. 



Protandrous bee flowers with nectar secreted and concealed in the usual way. 

 Often gynomonoecism, more rarely gynodioecism. 



2361. B. nigra L. (Sprengel, ' Entd. Geh.,' p. 309 ; Herm. MuUer, ' Fertilisation,' 

 pp. 498-9, ' Weit. Beob.,' IH, p. 46 ; Schulz, ' Beitrage,' I, p. 85 ; Kerner, ' Nat. 

 Hist. PI.,' Eng. Ed. i, U, p. 364; Kirchner, 'Flora v. Stuttgart,' p. 631; Loew, 



