LABIATAE 



315 



I. Bombus muscorum F.; 2. B. subterraneus L. ; 3. Osmia caerulescens L. 

 (=0. aenea Z.); 4. O. emarginata Z^/>. Krieger (Leipzig), the bee Eucera longi- 

 cornis Z. $. Frey-Gessner (Switzerland), the dasygastrid bee Osmia rufohirta Lep. 

 Ducke (Trieste), 2 bees Osmia aurulenta Pz., and O. bicolor Schr. MacLeod 

 (Flanders), 4 humble-bees, a short-tongued bee, an ant, and a beetle (Bot. Jaarb. 

 Dodonaea, Ghent, v, 1893, p. 379): (Pyrenees), a hover-fly, and a Bombyliid (op. 

 cit., iii, 1 891, p. 337). Scott-Elliot (Dumfriesshire), a humble-bee, and 2 hover-flies 

 ('Flora of Dumfriesshire,' p. 141). 



2377. A. pyramidalis L. (Sprengel, 'Entd. Geh./ p. 299; Herm. Miiller, 

 ' Alpenblumen,' pp. 307-8 ; Schulz, 'Beitrage,' II, p. 197 ; Ricca, Atti Soc. ital. sc. 

 nat., Milano, xiii, 1870.) This species is gynomonoecious with hermaphrodite 

 flowers, which Hermann Miiller describes as feebly protandrous, but Ricca as homo- 

 gamous. The style is situated at first above the stamens, but bends down between 

 the anthers after they have dehisced, thus bringing the stigma into the entrance, where 

 it is first touched by every nectar-seeking visitor. Cross-pollination is therefore 

 ensured when the flower is visited by insects : should such visits fail, automatic self- 

 pollination is effected as in A. reptans. 



Fig. 342. Ajuga pyramidalis, L. (after Herm. Muller). A. Completely developed flower; seen 

 from the side after removal of the calyx. B. Do., with calyx, seen from above (X 4). C. Lower part 

 of the corolla-tube, cut open from the side. C- Ho. o( A.genevensis, L.{x j). D. Relative positions 

 of stamens and stigma in a young flower. E. Do. in a mature flower. F. Do. in an old flower (x 7). 

 a, anthers ; gr, style ; h, nectar ; n, nectary ; ov, ovary ; sd, nectar-cover ; st, stigma. 



In addition to these protandrous hermaphrodite flowers, Schulz observed in the 

 South Tyrol sporadic gynomonoeciously distributed female ones. 



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

 Stated. 



Herm. Mailer (Alps), 3 humble-bees, skg. (with proboscides 9-13 mm. long), and 

 a hover-fly, po-dvg. Loew (Berlin Botanic Garden), on the hybrid A. pyramidalis Z. x 

 A. reptans Z., a humble-bee (Bombus agrorum F. 5, steadily skg.), and a saw-fly 

 (Athalia rosae Z., freq. on flowers and leaves, not skg.). 



2378. A. genevensis L. (Herm. Muller, ' Alpenblumen,' pp. 308-9; Schulz, 

 'Beitrage,' II, p. 222; Kirchner, 'Flora v. Stuttgart,' pp. 636-7.) The mechanism 

 of the protandrous, blue, hermaphrodite flowers of this species, which are arranged 

 in long, conspicuous inflorescences, resembles that of A. pyramidalis, the style being 



