This section is from the book "On British Wild Flowers Considered In Relation To Insects", by John Lubbock. Also available from Amazon: Nature Series On British Wild Flowers Considered In Relation To Insects.
Of this order we have only a single species, the common Bryony (Bryonia dioicd). The flowers are dioecious, the males in small clusters, pale yellow, about half an inch in diameter; the females much smaller. Both secrete honey.
Of this order there are four British genera: Tillaea, Cotyledon, Sedum, and Sempervivum. The first two contain a single species each. Of Sedum we have nine species. Though the flowers are small, yet from the localities they occupy, and from their bright colours they are somewhat conspicuous, and are visited by many insects for the sake of their honey, which is accessible even to those with short tongues. Some (S. acre, reflexum, and telephium) are proterandrous, while S. atratum, according to Ricca, is proterogy-nous; and S. rhodiola is dioecious.
This order consists, as far as Britain is concerned, of the genus Ribes, containing four species, the Gooseberry (R.grossuiariata), Red Currant (R. rubrnm), Black Currant (R. nigrum), and Mountain Currant (A*. alpinitm). They all supply honey. R. grosstilariata is proterandrous, and is said to have lost the power of self-fertili-ation. In R. rubrum and R. nigrum the stamens and pistil come to maturity simultaneously. R. alpinum, on the contrary, is dioecious; and it is interesting that, according to Mullr, this species is more frequented by insects than any of the others.