ACEROSE
acerate, acerose, acicular, needle-shaped
(adjective) narrow and long and pointed; as pine leaves
Source: WordNet® 3.1
Etymology 1
Adjective
acerose (not comparable)
(botany) Having the nature of chaff; chaffy.
Etymology 2
Adjective
acerose (not comparable)
(botany) needle-shaped, having a sharp, rigid point, as the leaf of the pine.
Source: Wiktionary
Ac"er*ose`, a. Etym: [(a) L. acerosus chaffy, fr. acus, gen. aceris,
chaff; (b) as if fr. L. acus needle: cf. F. acéreux.] (Bot.)
(a) Having the nature of chaff; chaffy.
(b) Needle-shaped, having a sharp, rigid point, as the leaf of the
pine.
Source: Webster’s Unabridged Dictionary 1913 Edition