萼片 is read as がくへん (gakuhen) and means sepal.
がくへん
gakuhen
はへん
fragment
だんぺん
もくへん
block (of wood)
かけら
ounce (of truth, conscience, etc.)
いっぺん
a piece
しへん
piece (scrap, bit, strip) of paper
たじょういっぺん
intensive zazen meditation on a subject
ぶんりへん
sequestral
きんぞくへん
piece of metal
じょうへん
strip
ひとひら
(one) leaf
かねびら
money