This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Herbaceous plants from the temperate parts of Europe and Asia, with fleshy, tuberous, or bulbiform rhizomes and long narrow radical slightly equitant keeled leaves, from the centre of which rises a leafless flower-stem. Flowers in corymbs something similar to those of some Lilies, but differing from them in having the six leaves of the perianth united at the base into a narrow tube enclosing the free ovary; capsule several-seeded, is the Greek name of this genus of plants, and signifies 'beauty of a day' or 'ephemeral beauty' in allusion to the duration of the individual flowers. Hence also the English name Day Lily.
Two species of this genus are commonly cultivated, and are useful in planting in shrubberies or where large clumps are required; for though the individual flowers last but a day or two, they succeed one another for a considerable time. The flowering season is from June to August; and they are perfectly hardy.
1. H.flava. Yellow Day Lily. - This differs from the following mainly in the colour of the fragrant flowers, and flat veinless perianth-leaves. South of France and other parts of Europe.
2. H. fulva (fig. 251). Tawny Day Lily. - This has copper or tawny coloured inodorous flowers, rather larger than the ureceding, with the perianth-leaves venous and wavy. H. Kwanso is a large garden form with double flowers. H. disticha and H. crocea are slight varieties.
Fig. 251. Hemerocallis fulva. (About 1/8 nat. size.)
H. minor, syn. H. graminea, H. Dumortieri and H. Mid-dendorfii are smaller-growing species, natives of Siberia, China, and Japan. All of them have the three interior perianth-segments membranous at the margin. The first has very narrow leaves, long pedicels and perianth-tube; the second has leaves about six lines broad and a very short perianth-tube; and the third has leaves from 8 to 12 lines broad and a distinct perianth-tube about 4 lines long. All have yellow fragrant flowers.