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. Kivanso 

 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- 

 ciric pollinations have been made between plants obtained from 

 such widely different sources as Wisconsin, Michigan, New 

 York, Vermont and England with complete failure i n cvery ^ 

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

 enlarge, and about 72 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 

 II. 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 //. Thunbergii and of II. aurantiaca has been used on 

 many flowers of //. 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 {b in Fig. 4). Tn a tew 

 instances, however, m ature po ds with ripe se gds (Fig. 5) have 

 been secured, but no germinatio n has yet been obtained in such 

 seeds. The reciprocals of these crosses likewise produce seed 

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

 aurantiaca and II. Thunbergii it appears thai it- pollen and ovules 

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

 the compatibility in these combinations is oi a weak grade. 



