Spinescent, tipped by or degenerating into a thorn.
Spinose, or Spiniferous, thorny.
Spiral Vessels or ducts, [135].
Spithameous, span-high.
Spora, Greek name for seed, used in compound words.
Sporadic, widely dispersed.
Sporangium, a spore-case in Ferns, &c., [158].
Spore, a body resulting from the fructification of Cryptogamous plants, in them the analogue of a seed.
Spore-case (Sporangium), [158].
Sporocarp, [162].