Two color photographs of Nicotiana glauca, (also known as tree tobacco), an evergreen shrub from the Nightshade family found on soil dumps around gravel and caliche pits.

One color photograph of Nuttallanthus texanus, (also known as Toadflax), an annual flowering plant from the Figwort family found on sandy soils in priaires, openings, fields, and waste places.

Four color photographs of Nymphaea elegans (also known as lampazos), a perennial aquatic plant from the Waterlily family found in ponds, ditches, swales, lakes, and streams of the Texas Coastal Bend.

Four color photographs of Oenothera speciosa, (also known as primrose), a perennial flowering plant from the Evening-Primrose family found on clay or loamy soils in prairies, openings, fields, and waste places and along roads.

One color photograph of Onosmodium bejariense (also known as false groomwell), a perennial flowering plant from the Heliotrope family found in Goliad County.

Four color photographs of Opuntia leptocaulis (also known as tasajillo), a flowering plant from the Cactus family found in brushy thickets, openings, and prairies of the Texas Coastal Bend.

Two color photographs of Oxalis, (also known as wood-sorrel), a perennial flowering plant from the Wood-Sorrel family found on various soils in the Texas Coastal Bend.

Two color photographs of oxalis dillenii, a perennial flowering plant from the Wood-Sorrel family found on a wide range of soils in prairies, openings, and waste places, and along roads.

Three color photos of Palafoxia texana (also known as Texas palafox), an annual flowering plant from the Aster family and is abundant on sandy and loamy soils in prairies, openings, and waste places of the Texas Coastal Bend.

Two color photographs of Parkinsonia aculeata, (also known as retama), a deciduous tree from the Pea family found in stream bottoms, swales, and other low places.