Robertson — Flowers and Insects. 159 



fleurs. Bull. Soc. royale bot.Belgique 17: 159. 1878. E. europaeus. — (7) 

 Miiiler, Die Stellung der Honigbiene in der Blumenwelt. III. Bienenzeitung 

 Jahrg. 39: 157-61. 1883. E. europaeus, Apis wanting. (Just 11^: 476).— 

 (8) Loew, Bluinenbesuch von Insekten an Freilandpflanzen. Jahrb. Bot. 

 Gartens Berlin 3: 82 (14) 1884.— (9) Loew, Weit. Beob. Uber den Blumen- 

 besuchvon Insekten an Freilandpflanzen. Jahrb. Bot. Gartens Berlin 4: 152. 

 1886.— (10) Kirchner, Flora von Stuttgart und Umgebung, 356. 1888. E. 

 europaeus.— (11) Trelease, Ilicineae aud Celastraccae. Trans. St. Louis 

 Acad. Sci. 5: 349-50. 1889.— (12) Schulz, Beitrage zur Kenntniss der Bestau- 

 bungseinrichtungen und Geschlechtsvertheilungbeiden Fflanzen. 2: 61, 185. 

 Bibliotheca Botanica 17. 1890.— (13) Kerner, Pflanzenleben 2 : 169. 1891. 

 E. europaeus. (Just 17^: 531) — (14) MacLfod, Bevruchtlng der bloemen 

 van Vlaanderen. Bot. Jaarboek 6: 246, 437. 1894. E. europaeus. (15) Loew, 

 Bliitenbiologische Floristik, 214, 378. 1894, E. europaeus. 



Aesculus L. — Most of the observations made upon this 

 genus were upon plants growing in Europe, where none of 

 them are indigenous. AH. rubicunda is andromonoecious, 

 with the perfect flowers proterogynous (Hildebrand 2). AE. 

 macrostachya is also andromonoecious, with the perfect 

 flowers proterandrous, and is adapted to nocturnal Lepidoptera 

 (Kirchner 21). AE. flava (lutea Wang, octandra Marsh.) has 

 most of its flowers fertile, is perforated by Bomhiis terrestris, 

 and in the Berlin Garden is visited by hive bees (see Loew 

 13, 26). According to Meehan (22) AE . parvijlora is 

 andromonoecious. Trelease (MS. notes) saw it visited by 

 bumble bees and by Trochilus coluhris (10). I suspect that 

 the Red Buckeye, ^iS". prtt'/a, is specially adapted to humming 

 birds. 



Aesculus hippocastanum L. ("Adv. from Asia via 

 Eu."). — Sprengel's account of this species left little to be 

 added. He was mistaken in regarding the perfect flowers as 

 proterandrous instead of proterogynous (2). The plant is 

 andromonoecious, but Ogle (4) found some flowers which were 

 pistillate from losing their anthers before dehiscence. The 

 flowers are supposed to be adapted to bumble-bees (1, 5, 11, 

 19). In my yard I have seen them visited by: — 



Bees — (1) Borabus americanorum F. 9, ab. ; (2) B. pennsylvanicus De. 

 G. ?, ab.; (3) B. separatus Cr. $, ab.; (4) B. virginicus Oliv. ?, ab.; (5) 

 B. scutellaris Cr. $ ; (6) Synhalonia f rater Cr. ,^9, ab. 



Birds — (7) Trochilus colubris L. 



