You can find an original version of the Daylily Handbook at
Below are three excerpts from chapter 3 "The Developmental Anatomy and Physiology of Daylily written by Paul D. Voth, Robert A. Griesbach and John R. Yeager which starts on page 121. There are figures in the chapter that help explain the text descriptions.
"In garden parlance, each fan or ramet
consists of a crown which produces
leaves above and roots below. The
crown, as gardeners call it, is an underground
stem which is being slowly
pulled into the ground by contractile
roots. Other names for this stem are
vegetative stem, rootstock, and pseudobulb." pg 121
From the legend for Fig 1
"Diagrammatic and simplified
longitudinal section of the base of a
daylily ramet in the summer of its second
season. The junction of leaf bases
and rootstock (stem) constitutes the
crown. Origin and development of stem
and roots and their internal organization
"The long leafless scape, part of which
in Figure II is hidden in the crown, may
reach a height of more than three feet to
L1• The scape contrasts sharply with
the underground stem, in which successive
leaves rest on each other (Fig. I) .
The ratio of distance between these corresponding
stem portions may be 1000: I
or even greater." pg 132
Yes, the "crown" is a very compressed stem.
The Daylily Dictionary definition of crown:
"The small white core located between leaves and roots, that is the modified stem of the daylily plant. Some crown tissue must be present for any daylily division to be viable."