_Scleros_, Greek for hard, hence _Sclerocarpous_, hard-fruited. _Scobiform_, resembling sawdust. _Scorpioid_ or _Scorpioidal_, curved or circinate at the end, 77. _Scrobiculate_, pitted; excavated into shallow pits. _Scurf_, _Scurfiness_, minute scales on the surface of many leaves, as of Goosefoot. _Scutate_, _Scutiform_, buckler-shaped. _Scutellate_, or _Scutelliform_, saucer-shaped or platter-shaped. _Secund_, one-sided; i. e. where flowers, leaves, &c., are all turned to one side. _Secundine_, the inner coat of the ovule, 110. _Seed_, 125. _Seed-leaves_, see _cotyledons_. _Seed-vessel_, 127. _Segment_, a subdivision or lobe of any cleft body. _Segregate_, separated from each other. _Semi-_, in compound words of Latin origin, half; as _Semi-adherent_, as the calyx or ovary of Purslane; _Semicordate_, half-heart-shaped; _Semilunar_, like a half-moon; _Semiovate_, half-ovate, &c. _Seminal_, relating to the seed (_Semen_). _Seminiferous_, seed-bearing. _Sempervirent_, evergreen. _Sensitiveness_ in plants, 149, 152. _Senary_, in sixes. _Sepal_, a leaf or division of the calyx, 14, 79. _Sepaloid_, sepal-like. _Sepaline_, relating to the sepals. _Separated Flowers_, those having stamens or pistils only, 85. _Septate_, divided by partitions. _Septenate_, with parts in sevens. _Septicidal_, where dehiscence is through the partitions, 123. _Septiferous_, bearing the partition. _Septifragal_, where the valves in dehiscence break away from the partitions, 123. _Septum_ (plural _septa_), a partition or dissepiment. _Serial_, or _Seriate_, in rows; as _biserial_, in two rows, &c. _Sericeous_, silky; clothed with satiny pubescence. _Serotinous_, late in the season. _Serrate_, the margin cut into teeth (_Serratures_) pointing forwards, 55. _Serrulate_, same as the last, but with fine teeth. _Sessile_, sitting; without any stalk. _Sesqui-_, Latin for one and a half; so _Sesquipedalis_, a foot and a half long. _Seta_, a bristle, or a slender body or appendage resembling a bristle. _Setaceous_, bristle-like. _Setiform_, bristle-shaped. _Setigerous_, bearing bristles. _Setose_, beset with bristles or bristly hairs. _Setula_, a diminutive bristle. _Setulose_, provided with such. _Sex_, six. _Sexangular_, six-angled. _Sexfarious_, six-faced. _Sheath_, the base of such leaves as those of Grasses, which are _Sheathing_, wrapped round the stem. _Shield-shaped_, same as _scutate_, or as _peltate_, 53. _Shrub_, _Shrubby_, 39. _Sieve-cells_, 140. _Sigmoid_, curved in two directions, like the letter S, or the Greek _sigma_. _Silicle_, a pouch, or short pod of the Cress Family, 123. _Siliculose_, bearing a silicle, or a fruit resembling it. _Silique_, capsule of the Cress Family, 123. _Siliquose_, bearing siliques or pods which resemble siliques. _Silky_, glossy with a coat of fine and soft, close-pressed, straight hairs. _Silver-grain_, the medullary rays of wood, 139.