474 . ANGIOSPERMAE—DICOTYLEDONES 



329. Trinia Hoffm. 



1109. T. glauca Reichb. (=T. vulgaris DC). (Henslow, ' Origin of Floral 

 Structures,' p. 227; Schulz, ' Beitrage,' II, pp. 90, 91, 189.) — Henslow and Schulz 

 describe this species as frequently dioecious, though undoubtedly androdioecious at 

 times. The latter states that female flowers sometimes replace hermaphrodite ones. 



330. Helosciadium Koch. 



mo. H. inundatum Koch ( = Apium inundatum Reichb./.). (Knuth, ' Bl. u. 

 Insekt. a. d. nordfr. Ins.,' p. 78.) — The flowers of this species are only 2 mm. in 

 diameter. The plants observed by me in the island of Fohr can be effectively 

 self-pollinated, for protandry is ill marked. 



iiii. H. nodiflorum Koch ( = Apium nodiflorum Reichb./.). — The flowers of 

 this species are distinctly protandrous. Secretion of nectar stops when the anthers 

 shrivel and begins again when the stigmas mature. It ceases altogether when the 

 petals fall off. 



Visitors. — MacLeod saw 2 Muscids and a Neuropterid in Flanders (Bot. Jaarb. 

 Dodonaea, Ghent, vi, 1894, pp. 259-61). 



331. Falcaria Riv. 



1112. F. vulgaris Bernh. ( = F. Rivini Host, F. sioides Aschers., and Sium 

 Falcaria L.). (Schulz, 'Beitrage,' II, p. 190.)— Schulz describes this species as 

 andromonoecious, with markedly protandrous hermaphrodite flowers. The primary 

 umbels usually contain hermaphrodite flowers only ; secondary ones now and then 

 bear 1-3 central male flowers, which owing to their position are the first to develop. 

 The rather small tertiary umbels flower late and are purely male. 



Warnstorf describes the umbellules of the primary umbels as hermaphrodite; 

 those of the secondary ones as bearing marginal hermaphrodite and central male 

 flowers, or male flowers only. It rarely happens that the umbels bear hermaphrodite 

 flowers. 



Visitors. — Warnstorf observed flies and beetles. 



332. Ainini L. 



1113. A. majus L. Schulz (' Beitrage') describes this species as being andro- 

 monoecious, with protandrous hermaphrodite flowers of white colour. 



Visitors. — Schletterer observed an Ichneumonid (Trachynotus foliator F.) and 

 a Scoliid (Tiphia minuta v. d. L.) at Pola. 



333. Aegopodium Knaut. 



1114. A. Podagraria L. (Herm. jNIuller, 'Fertilisation,' pp. 266-7, ' Weit. 

 Beob., I, p. 303, ' Alpenblumen,' p. 116; Knuth, ' Bl. u. Insekt. a, d. nordfr. Ins.,' 

 pp. 78, 155; MacLeod, Bot. Jaarb. Dodonaea, Ghent, vi, 1894, pp. 211-54; Loew, 

 ' Bliitenbiol. Floristik,' pp. 388, 292.)— Warnstorf says that at Ruppin the umbellules 

 of the primary umbels bear hermaphrodite flowers, those of the secondary umbels 



