DISTRIBUTION OF SEXES 33 
Poterium Sanguisorba. Usually §, 9, and § on the same plant, occasionally 
also gynomonoecious, or andromonoecious, or purely monoecious. 
Rumex maritimus and other species. Frequently gynomonoecious, less frequently 
gynodioecious. Sometimes purely. § and 9 stocks. 
Alchemilla vulgaris, fissa, alpina, and pentapetala. Male- and female- 
pleogamous forms locally replace hermaphrodites. 
3. Dioecism predominates; the sexes about equally well represented. Hermaphrodtte 
and pleogamous forms are not numerous. 
Silene Otites and acaulis. Almost exclusively dioecious. 
Melandryum album. Dioecious. & and ? equally common. Hermaphrodite 
forms very rare. 
M. rubrum. Usually dioecious. § and 9 sometimes equally common, 
sometimes one (generally 9) predominating. Hermaphrodite plants commoner 
than in the preceding species (often up to 5%). Sporadically monoecious, very 
rarely andromonoecious. 
Fragaria elatior. In some places dioecious, in other places purely hermaphrodite 
flowers (up to 10%); in places only female- and male-pleogamous, often gyno- 
monoecious; on the other hand, andromonoecious individuals are occasionally 
altogether absent. 
Rubus Chamaemorus. Dioecious. In the Riesengebirge sometimes almost 
completely falsely hermaphrodite. 
Valeriana dioica. Usually dioecious, 9 usually in two forms; 9 rare and 
local. 
V. saxatilis. 6 and @ plants equally common, § sporadic; may also be 
andromonoecious and gynomonoecious, frequently 9 and 4, rarely 9, §,and 9 
on the same plant. 
Trinia glauca. § and 9 plants about equally common. Various pleogamous 
forms occur locally. 
Rumex Acetosa, Acetosella and arifolius. 6 and ¢? plants equally common, 
rarely gynomonoecious, or andromonoecious, or hermaphrodite. 
Rhodiola rosea. Dioecious (in the Riesengebirge according to Schulz, on 
the Dovrefjeld according to Lindman) or trioecious (in the Alps according to 
Ricca, in Greenland according to Warming). 
Empetrum nigrum. In the North Frisian Islands trioecious, with very rare 
hermaphrodite forms (Buchenau), similarly on the Dovrefjeld (Lindman); in 
Greenland only dioecious (Warming). 
Asparagus officinalis. Usually dioecious; rarely purely hermaphrodite, andro- 
monoecious, and gynomonoecious plants. 
The above-mentioned investigations, undertaken by Schulz with great care and 
perseverance, still require much amplification to make them complete. On this 
point Loew (‘Bliitenbiol. Floristik,’ p. 392) remarks that ‘Progress in this sphere 
is only possible by correlated and systematized work, conducted by many 
investigators.’ 
DAVIS D 
