aciculate

adj

1. Furnished with aciculae.
2. acicular (needle-shaped)

   “The chief points of difference between specimens of the two are that those of R. mutabilis are more setaceous, but less aciculate on the barren stems, the terminal leaflets are more frequently narrowed at the base, though occasionally they have the ovate form usual in the Plymouth plant.”

3. Marked with fine irregular streaks as if scratched by a needle.