234 THE FERTILISATION OF FLOWERS. [PART IIL. 
flattened anthers dehisce edgewise as in Fragaria, and only their 
thin edges remain coated with pollen. 
Visitors: A. Hymenoptera—Apide : (1) Andrena denticulata, K. 2 g,s. 
and cp.; (2) A. parvula, K. 2, cp. B. Diptera—(a) Bombyliide: (3) Sys- 
teechus sulfureus, F., s, (Sld.) ; (b) Syrphide : (4) Chrysotoxum:bicinetum, L., 
freq. (Sld.) ; (5) Melithreptus scriptus, L., f.p. ; (6) Cheilosia sp. (pictipennis, 
Egger ?), f.p. See also No. 590, 11, and No. 609. 
Potentilla iiaouiek: Lodd.—The flowers, according to 
Delpino, are proterandrous, with short-lived stigmas: in the first 
stage the anthers are unripe and radiate outwards; in the second, 
they stand erect on a level with the stigmas. Andrena and 
Halutus were observed to visit the flower (178, 360). 
Potentilla argentea, L.—Twenty species of insect-visitors are 
enumerated in my Weitere Beobachtungen, I. : 
Potentilla Salisburgensis, Haenke (= P. aurea, var. 8), P. aurea, 
L., P. grandiflora, L., P. caulescens, L. (vide Die Alpenblumen, pp. 
218222), 
Sibbaldia procumbens, L.—The honey lies fully exposed, and 
the tiny, greenish-yellow flowers are abundantly visited by small, 
short-lipped insects (Muscide, Ants, Ichneumonide),. Stigmas and 
anthers ripen simultaneously, but stand too far apart for spontaneous 
self-fertilisation to take place (609, fig. 87). 
Tribe Poteriec. 
144, ALCHEMILLA VULGARIS, L.—The tiny flowers are desti- 
tute of a corolla. A yellow fleshy ring on the inner wall of th 
Fia. 76.—Alchemilla vulgaris, L. 
a —Flower with | pce stamens and short style, from above. 
2.—Ditto, viewed obliquely, from above, 
8.—Ditto, with three perfect and one abortive stamen, and perfect style. 
4,—Ditto, with style still more developed, and all the stamens abortive. 
a, epicalyx ; b, calyx ; ¢, stainen; c’, abortive stamen ; d, stigma; e, nectary. 
receptacular’ tube, which surrounds the style and, later on, th 
ovary, secretes a thin layer of honey and gives a greenish-yello 
appearance, at a little distance, to the whole inflorescence. Owin 
