PART III. | THE MECHANISMS OF FLOWERS. 509 
Orv. ILLECEBRACEL, 
Lllecebrum verticillatum, L., has submerged cleistogamic 
flowers (351). 
Herniaria glabra, L.—The flowers are very inconspicuous, and 
are visited by minute insects (590, II.). 
Scleranthus perennis, L.—The small inconspicuous flowers have 
no petals; the sepals, which are white at the edges, take the place 
of a corolla; the honey, which is secreted in the lower half of 
the calyx, is accessible to short-lipped insects. Anthers and 
stigmas ripen together, and the widely outspread position of the 
stamens favours cross-fertilisation. I have found Hedychrum 
coriacewm, Dhlb. (Chryside), sucking honey in the flowers. 
Orv. AMARANTACE LZ. 
Chamissoa affords an example of the passage from a dimorphic 
to a diclinous condition (555). 
Orv. CHENOPODIACEZ. 
Chenopodium ambrosioides is figured by Hildebrand as an 
example of a self-fertilised plant (351). 
Chenopodium album, L., is anemophilous, but is visited by 
pollen-eating Syrphide (Melanostoma mellina, L.) (590, 11.). 
Chenopodium bonus-Henricus is proterogynous according to 
Warming (762). 
Orv. POLYGONACE LZ. 
369. PoLyGoNuM FAGoPyRUM, L.—The flowers are made con- 
spicuous by their white or red perianth, by aggregation, and by 
their perfume. Eight rounded yellow glands at the base of the 
stamens secrete honey, which lies at the bottom of the shallow 
outspread perianth ; it is accessible to short-lipped insects, and 
attracts great numbers of insects of different orders. 
Three stamens, with their pollen-covered sides turned outwards, 
stand close round the styles in the middle of the flower; five, with 
their pollen-covered sides directed inwards, stand round the cir- 
cumference. The eight nectaries lie at the bottom of the flower 
between the inner and outer stamens, so that insects must come 
between these to reach the honey, and hence get dusted with 
