77 

 the grains of pollen are spherical and larger. The tube of 

 the corolla is of uniform size exce|)t close to the upper end. 

 The numl)er of seeds produced is larger. " He also notes 

 that the short-styled form is more fertile. 



Mueller records many visitors such as Apis m^Uifica, 

 Bombus hortorum, while B. terrestris perforates; Diptera 

 {Bombylius). 



Stfironema lanceolatum Gray, is common in low grounds. 

 It is from ten inches to two feet high and has yellow flowers 

 with purple centers. Rohertson gives the following account 

 of its pollination: "The flowers look outward and a little 

 downward. In the hud each corolla lobe enfolds an anther. 

 When the flower expands, the lobes carry the enclosed an- 

 thers with them, holding them while the stigma is receptive 

 and is exposed to insects — a fact to which my attention was 

 first called by Professor Pammel. After the anthers are re- 

 leased, the styles are commonly found bent outwar.ls out of 

 the way of the fallen polling. Sprengel supposed that the 

 flowers of Lysimachia quadrifolia were nectar-bearing, 

 but failed to find nectar. He, and Mueller also, failed to 

 find honey in flowers of Zj. vulgaris- According to Kirsch- 

 ner, nectar is wanting in L. nemorum as well as in L. num- 

 mularia. I have been uncertain in regard to the occurrence 

 of honey in Steiranema, but the visits of male bees seem 

 to indicate its presence, although these insects might search 

 for it in vain. They commonly fly about the flowers to find 

 the females, not trying to find honey." 



Lilac. The comm(m lilac (Syringa vulgaris) 

 as well as the Persian [8. Persica) are com- 

 mon objects of cultivation. The flowers are borne in large, 

 loose panicles, conspicuous because of the lilac color and the 

 strong odor. The two stamens block the tube of the corol- 



