One color photograph of Setaria parvifloria, a plant from the Grass family.

One color photograph of Sida abutifolia, a perennial flowering plant from the Mallow family found in pastures and woods on sand, clay, or caliche.

Two color photographs of Sisyrinchium (also known as grass violet or blue-eyed grass), a perennial or annual flowering plant from the Iris family found in various places of the Texas Coastal Bend.

Three color photographs of Solanum triquetrum, (also known as tomatillo), a perennial flowering plant from the Nightshade family found in pastures, woods, and waste places.

Four color photographs of Sophora secundiflora, (also known as Texas mountain-laurel), an evergreen shrub or small tree from the Pea family found on caliche ridges north and west of Mathis and along bluffs and ravines.

One color photograph of Sphaeralcea angustifolia.

One color photograph of Sphaeralcea lindheimeri (also known as globe mallow), a perennial flowering plant from the Mallow family found on deep sands both inland and along the coast.

One color photograph of Spiranthes vernalis, (also known as ladies tresses), a perennial flowering plant from the Orchid family found in moist low grounds along the coast from Aransas Refuge to Flour Bluff and the barrier islands.

Three color photographs of Stachys drummondii (also known as hedge nettle), an annual-biennial flowering plant from the Mint family found on various soils in pastures and woods.