Robertson — Floivers and Insects. 159 



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

 Mliller, Die Stellung cler Honigbiene in der Blumenwelt. III. Bienenzeitung 

 Jahrg. 39: 157-61. 1883. E. europaeus, Apis wanting. (Just 11^: 47G).— 

 (8) Loew, Blumenbesuch von Insekten an Freilandpflanzeu. Jahrb. Bot. 

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

 besuch von Insekten an Freilandpflanzeu. Jahrb. Bot. Gartens Berlin 4: 152. 

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

 europaeus. — (11) Trelease, Ilicineae and Celastractae. Trans. St. Louis 

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

 burgseinrichtungen und Gcschlechtsvertheilungbeiden Pflanzen. 2: 61, 185. 

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

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

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

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



Aesculus L. — Most of the observations made upon this 

 genus were upon plants growing in Europe, where none of 

 them are indigenous. AE. rubicunda is andromonoecioiis, 

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

 macrostacJiya is also andromonoecious, with the perfect 

 flowers proterandrous, and is adapted to nocturnal Lepidoptera 

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

 most of its flowers fertile, is perforated by Bombus ierrestris, 

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

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

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

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

 the Red Buckeye, ^^.2?«?^2«, is specially adapted to humming 

 birds. 



Aesculus hippocastanum L. ("Adv. from Asia via 

 Eu."). — Spreugel'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) Bombus americanorum F. 9» ab. ; (2) B. pennsylvanicus De. 

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

 B. scutellaris Cr. J ; (6) Synhalonia f rater Cr. cT?, ab. 



Birds— (7) Trochilus colubris L. 



