Lewis & Short

sessĭlis, e, adj. [sedeo].

  1. I. Of or be longing to sitting, fit for sitting upon (only in the poets and in post-Aug. prose): tergum (equi), Ov. M. 12, 401: obba, i. e. with a broad foot, Pers. 5, 148; so, pira minimo pe diculo, Plin. 15, 15, 16, § 56.
    Hence,
  2. II. Transf., of plants, low, dwarf: genus lactucae, growing low, spreading, Plin. 19, 8, 38, § 125; Mart. 3, 47, 8 (for which: sedens lactuca, id. 10, 48, 9): folium (brassicae), Plin. 19, 8, 41, § 140: malvae, Pall. Oct. 11, 3.