LABIATAE 247 



large numbers, skg. ; n. Melecta armata /'a. }, skg. ; 12. Osmia adunca Latr.i, 

 do. ; 13. O. aenea L. 5 and S, the $ numerous, skg. ; 14. O. fulviventris Pz. 5, skg. ; 

 15. O. rufa L. 5, do. B. Lepidoptera. (a) Geometridae : 16. Acidalia virgularia 

 /^(5n., skg. in the evening; 17. Halia wauaria Z., do. {b) Nocluidae: 18. Agrotis 

 exclamationis Z., do.; 19. A. latens Hbn., do.; 20. Plusia gamma Z., do; 21. P. 

 triplasia L. do. (c) Pyralidae : 22. Eurrhypara urticata Z., skg. in the evening. 

 {d) Rhopalocera: 23. Pieris sp., skg. ; 24. Epinephele janira Z., do. C. Thysano- 

 ptera. 25. Thrips, freq. in the flowers. 



2223. L. Stoechas L. — Kerner says that the flowers of this South European 

 species possess conspicuous blue bracts, projecting beyond the corollas on the upper 

 part of the spikes, and greatly enhancing their conspicuousness. 



701. Elsholtzia Willd. 



2224. E. cristata Willd. (= E. Patrini Garcke,%x\.A Mentha Patrini Lepech.). — 

 The mint-like smell of the whole plant in this species tends to attract insects. The 

 small, bright-coloured flowers grow in unilateral racemes turning outwards. 

 The slightly curved corolla-tube is 2 mm. broad at its mouth, scarcely one mm. 

 broad and only 3 mm. long at its base, so that nectar is accessible even to 

 short-tongued insects. Self-pollination is at first prevented by protandry-; later 

 on it may take place automatically, as the stigma is then situated between the 

 upper, shorter anthers, and these are still covered with pollen. 



Visitors. — Knuth observed the following in the Kiel Botanic Garden 

 (30. 8. '98).— 



Thrips, and skg. Diptera, i.e. 2 hover-flies (Ascia podagrica F., and Eristalis 

 tenax Z.), and Muscids — Lucilia caesar Z., Sarcophaga carnaria Z., and several 

 medium-sized sp. 



702. Coleus Lour. 



2225. C. Blumei Benth. (?) (Delpino, 'Ult. oss.,' pp. 143-4; Herm. Miiller, 

 ' Weit. Beob.,' Ill, pp. 58-9.) — The flowers of this species deviate considerably from 

 the Labiate type, and approximate to those of Papilionaceae. According to the 

 descriptions of Delpino and Hermann Miiller, the upper lip is modified into a kind 

 of carina surrounding the stamens and style, while the lower part of the corolla-limb 

 forms a small vexillum. Below this is the entrance to the nectar concealed in the 

 base of the corolla-tube. By placing itself on the carina and inserting its proboscis 

 into the corolla-tube, a bee depresses the easily movable carina, and touches either 

 the stigma or the pollen-covered anthers, as the case may be, so that cross-pollination 

 is always effected. 



703. Mentha L. 



Gynodioecious or gynomonoecious flowers, growing in conspicuous whorls. 

 Nectar is secreted and concealed in the usual way. The hermaphrodite flowers are 

 protandrous and larger than the female ones, which are most frequent at the 

 beginning of the flowering season. Darwin describes some species as dimorphous. 

 The leaves and flowers are strongly aromatic. 



2226. M. arvensis L. (Herm. Miiller, ' Fertilisation,' pp. 470-1 ; Kirchner, 

 ' Flora V. Stuttgart,' p. 610 ; Schulz, ' Beitrage,' II; Knuth, ' Bloemenbiol. Bijdragen ' ; 

 Mowes, Bot. Jahrb., Leipzig, iv, 1883.) — In this species the very large nectary 



