The Collaborative International Dictionary
Angustifolious
Angustifoliate \An*gus`ti*fo"li*ate\
([a^]n*g[u^]s`t[i^]*f[=o]"l[i^]*[asl]t), Angustifolious
\An*gus`ti*fo"li*ous\ ([a^]n*g[u^]s`t[i^]*f[=o]"l[i^]*[u^]s), a.
[L. angustus narrow (see Anguish) + folium leaf.] (Bot.)
Having narrow leaves.
--Wright.
Wiktionary
angustifolious
a. (context botany English) Having narrow leaf.