art ut) THE MECHANISMS OF FLOWERS. 253 
ab. ; (5) Sphecodes gibbus, L. 9, freq. ; (6) Nomada ferruginata, K. 9 ; (7) 
Prosopis armillata, Nyl. 2, ab. ; (8) Pr. variegata, F. ¢; (9) Pr. brevicornis, 
Nyl. ¢ ; (10) Megachile circumcincta, K. 2, all sucking ; (11) M. centuncularis, 
‘L. 2, «p.; (b) Sphegide: (12) Ammophila sabulosa, L.; (13) Oxybelus 
uniglumis, L., ab., both sucking. B. Diptera—(a) Syrphide: (14) Eristalis 
tenax, L., fp. ; (b) Muscide : (15) Pyrellia wnea, Zett., s. 
163. SEDUM REFLEXUM, L., with a similar arrangement of its 
flowers, is in like manner visited by insects of various orders. 
I saw upon its flowers: (1) Megachile maritima, K. ¢ (Apide), sucking ; 
(2) Eristalis tenax, L. (Syrphide), both sucking and eating pollen. A further 
list is given in No. 590, 1. 
Sedum album, L.—This species is so decidedly proterandrous, 
i that spontaneous self-fertilisation as a rule can scarcely result even 
in default of insect-visits. I have found the plant visited abun- 
dantly by insects, both on the granite of Luisenberg in the Fichtel- 
gebirge (590, I.) and in the subalpine region of the Alps (690). 
- 164, Szepum TELEPHIUM, L.—The stamens dehisce introrsely, 
first the five alternating with the petals, and then the inner series, 
and at once cover themselves all round with pollen. The stigmatic 
Fic, 84.—Sedum Telephium, L. 
1.—Flower, from above. 
_2.—Ditto, after removal of the pistil, to show the five nectaries. 
_ papillse develop upon the pointed ends of the styles, after the last 
Stamens have withered. Since the petals and stamens are spread 
_ out as widely as the adjacent flowers permit, self-fertilisation does 
10t take place in default of insect-visits, even when the anthers 
re still stored with pollen at the ripening of the stigmas. 
_ The honey-glands are at the points of long scales hidden under 
he ovaries, at the bases of the petals. Insects which creep oyer 
