476 THE FERTILISATION OF FLOWERS. [PART III, 
taste of its honey, it has a compensating advantage in its large 
flowers crowded more closely together on higher stalks. The 
plant has lost the power of self-fertilisation. Though the flower 
is larger than that of Thymus, the tube is short enough (in the 
hermaphrodite flowers 4 to 5 mm., in the pistillate 3 to 4 mm., 
long) to permit a great variety of insects to reach the honey. My 
shorter list of visitors is due to my having had much less opportunity 
of watching the plant. 
Visitors: A. Hymenoptera—Apide: (1) Bombus terrestris, L. 2; (2) 
Apis mellifica, L. §, freq. ; (3) Halictus cylindricus, F. ¢; (4) H. albipes, 
F. $, both species very ab. ; (5) H. nitidus, Schenck, ¢, all sucking. B. 
Diptera—(a) Empide : (6) Empis livida, L. ; (7) -E. rustica, Fallen, both very 
ab., s.; (b) Syrphide : (8) Ascia podagrica, F., f-p., ab. ; (9) Eristalis arbu- 
storum, L., s. and f.p., ab. ; (10) E. nemorum, L., do. ; (11) Helophilus pen- 
dulus, L.,s. ; (c) Conopide : (12) Sicus ferrugineus, L. ; (13) Myopa polystigma, 
Rondani; (14) M. variegata, Mgn., all three sucking; (d) Muscide: (15) 
Ocyptera brassicaria, F. ; (16) O. cylindrica, F., both very ab. ; (17) Prosena 
siberita, F., ab., all three s. C. Lepidoptera—Rhopalocera : (18) Satyrus 
Janira, L., s.; (19) S. hyperanthus, L., s. See also No. 590, UL, and 
No. 609. 
Satureia hortensis, L., is gynodicecious, and the female flowers 
are much more productive than the hermaphrodite (Darwin, No. 
167 ; for list of visitors see No. 590, III). 
343. CALAMINTHA CLINOPODIUM, Spenner (C. vulgare, L.).— 
The nectaries and honey-receptacle are formed on the ordinary 
Labiate type. The corolla-tube is 10 to 13 mm. long, and is often 
filled for a space of 3 mm. with honey. 
The inferior division of the style forms a broad, lanceolate 
lamina, which is bent downwards and bears no distinct stigmatic 
papillz ; the upper is much narrower and shorter, and of very 
varying size. There is still more striking variability in the 
‘development of the stamens, some or all of them being partially 
or completely aborted in many flowers. This isremarkable because 
it shows us how Natural Selection could have operated, and must 
have operated if, together with the proterandrous condition, there 
came into existence small-flowered plants which were visited as a 
rule after the others. 
Visitors : Lepidoptera—Rhopalocera : (1) Pieris brassice, L. (15), not rare ; 
(2) Satyrus hyperanthus, L.,—both species s. See also No, 609. 
Calamintha Nepeta, Sav., is gynodicecious, and visited by bees 
and butterflies (609, 734). 
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