Yucca smalliana; Adam's needle
A species of yucca with narrow, thread-like filaments on the leaf margins. The Japanese name 糸蘭 literally means 'thread orchid', referring to the fibrous strands.
When I planted a Yucca smalliana in the garden, white flowers bloomed in summer.
The name 糸蘭 (いとらん) combines 糸 (thread) and 蘭 (orchid), describing the plant's thread-like leaf filaments and its orchid-like appearance. The reading is a straightforward kun'yomi compound.