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incompatible — a type of sterility very common in daylilies. But 

 it also happened to have the habit of spreading vigorously by 

 rhizomes and this made vegetative propagation easy and has 

 maintained the individual character of the original seedling 

 throughout several centuries of garden culture. This clon remains 

 today in vigorous growth and is thus a demonstration that long- 

 continued asexual reproduction does not of itself necessarily re- 

 duce vigor and lead to degeneration. We may perhaps assume 

 that the Daylily Europa had its origin in the Orient, together 

 with the Lemon Daylily (H. flava). How and when these two 

 found their way into garden culture in Europe as reported in 1567 

 are at present apparently matters of conjecture. 



A plant of the Europa Daylily is among the most robust of day- 

 lilies. In coarseness of foliage and vigor of growth it is surpassed 

 only by the double-flowered form. The dome of leaves reaches a 

 height of about three feet. The leaves are light green, strongly 

 distichous in arrangement, and rather coarse. The plant extends 

 itself vigorously by widely spreading rhizomes. The roots are 

 numerous, and some are enlarged or fleshy. The strong scapes 

 are stiffly erect to a height of about 50 inches, are branched at the 

 summit, and bear as many as 15 to 20 flowers. 



The flowers have a fulvous overcast of color in the outer zone 

 of the open flower with reticulated veins of darker shades. An 

 arching mid-zone of darker shade in the petals is a conspicuous 

 feature. The throat of the flower is orange only. The petals 

 are rather thin, slightly wavy along the margin, and of delicate 

 texture, yet they retain form and color well during the day. The 

 segments are rather broad and overlapping, giving a full (lower. 



The capsule, produced only rarely and to the compatible fertili- 

 zations of certain cross-pollinations, is about one inch in length, 

 broadly ovate, with the apex truncate and indented. 



The persistent self-unfruitfulness of the entire clon of the 

 Europa Daylily makes it impossible to obtain selfed seedlings of 

 the clon. Its sterilities in cross-relations are also so decided that 

 it is only within very recent years that the clon Europa has been 

 used successfully in hybridization with other daylilies. 



2. The Double-flowered Fulvous Daylilies 

 The varietal names "Kzvanso" and "flore-pleno" have been 

 given to double-flowered daylilies that are very closely related to 



