58 



( 1 869-1870) and there called H. disticha var. flora plena 

 (disticha is now considered as a synonym of fulva). The 

 colored plate shows this to be quite different from var. Kwanso 

 in appearance. The writer has never seen this variety. A 

 double-flowered variety has also long been known in the species 

 H. Dumortierii. 



A thorough search of the literature indicates that no one has 

 ever reported fruit on the single-flowered type of H. fulva. 

 This orange-colored day lily is widely distributed over Europe and 

 America. Its complete failure to produce fruit and seeds has 

 often been noted. Only one variety of it (var. maculata) ap- 

 pears to have been involved (probably as a pollen parent) in 

 the production of hybrids. 



In the writer's experiments with this species many intra-spe- 

 cific pollinations have been made between plants obtained from 

 such widely different sources as Wisconsin, Michigan, New 

 York, Vermont and England with complete failure in every 

 case. The ovaries of flowers thus pollinated do not start to 

 enlarge, and about J2 hours after the flowers open the entire 

 flower falls leaving only spurs as shown at a in Fig. 4. 



But the pollen of this species used in controlled crossing on 

 H. flava has given pods (Fig, 2) with seeds and the hybrids 

 resulting are now being grown. The reciprocal cross between 

 these two species failed to yield mature pods. Pollen of H. 

 -fulva on H. minor has given seed but no germination was se- 

 cured. 



Pollen of H. Thunbergii and of H. aurantiaca has been used on 

 many flowers of H. fulva. Usually the pods begin to form and 

 seeds start to develop with some of them, but as a rule the 

 pods fall when about one third mature (& in Fig. 4). In a few 

 instances, however, mature pods with ripe seeds (Fig. 5) have 

 been secured, but no germination has yet been obtained in such 

 seeds. The reciprocals of these crosses likewise produce seed 

 rarely. From the results of crossing H. fulva with H. flava., H. 

 aurantiaca and H. Thunbergii it appears that its pollen and ovules 

 are potent and are able to function in certain relations, but that 

 the compatibility in these combinations is of a weak grade. 



