PART III. | THE MECHANISMS OF FLOWERS. 501 
Teucrium Chamedrys, L., is proterandrous; the movements of 
the reproductive organs are similar to, but feebler than, those of 
T. Scorodonia, 'The visitors are bees, and a proboscis 7 to 10 mm. 
long is requisite to reach the honey (609). 
Teucrium Botrys, L., is visited by species of Anthidium 
(590, II). 
366. AJUGA REPTANS, L.—The tube is 9 mm. long, and is 
expanded for 24 mm. at the base; the lower expanded part is 
white, and full of honey, which is secreted by a thick, yellow, 
fleshy gland below the ovary on the side turned towards the under 
lip. The upper lip is absent, but the protruding anthers of each 
flower are sheltered by the bract of the flower above. When 
the flower opens, the two stigmas diverge to their full extent 
and their papillae are already mature.  Cross-fertilisation is 
favoured not by dichogamy but by the position of the organs. 
For in young flowers the lower division of the style, provided at 
its tip with stigmatic papille, rests upon the shorter stamens 
which lie close together, and is protected by them from contact 
with the bee visitors, at least in the case of the smaller bees which 
do not force the stamens much apart; while all the anthers turn 
their pollen-covered faces forwards and downwards so as to touch 
all insect-visitors. Afterwards the inferior stamens separate, the 
style loses their support, and its lower division, with the stigmatic 
tip turned downwards and forwards, projects between the anthers, 
and is touched before them by the bee. 
In absence of insects, the pollen remains adhering to the 
lower surface of the anthers in large masses, which readily come 
in contact with the stigma and effect self-fertilisation. 
Visitors : A. Hymenoptera—Apide: (1) Apis mellifica, L. 9 (6), thrusts 
the greater part of its head into the tube; (2) Bombus lapidarius, L, 9? 
— (12—14) ; (8) B. agrorum, F. 2 (12—15) ; (4) B. confusus, Schenck, ? (12—14); 
_ (5) B. muscorum, F. 9 (13—14) ; (6) B. pratorum, L. § (8) ; (7) B. silvarum, 
iL. 2 (12—14); (8) B. hortorum, L. 9 $8 (18—21) ; (9) Anthophora pilipes, ‘F. 
2 S$ (19—21) ; (10) Osmia rufa, L. ¢ (7—8) ; (11) O. enea, L. 2 (9—10) ; 
_ (12) O. fusca, Christ. (=bicolor, Schrk.), all sucking normally and dusting 
their heads with pollen ; (13) Andrena nitida, Foure. 2 (34) ; (14) A. labialis, 
 K. &; (15) Halictus zonulus, Sm, 2 (4); these three are unable to reach the 
honey, and abandon the plant after visiting a few flowers. B. Diptera—Syr- 
_ phide : (16) Rhingia rostrata, L. (11—12), usually s. and f.p. on the same flower, 
while sucking it dusts its head with pollen. C. Lepidoptera—(a) Rhopalocera : 
(17) Pieris brassicee, L. (15) ; (18) P. napi, L.; (19) P. rape, L. ; (20) Rho- 
docera rhamni, L. (15—16); (21) Papilio Podalirius, L.; (22) Hesperia 
