Three color photographs of Machaeranthera phyllocephala (also known as camphor daisy), an annual flowering plant from the Aster family found on beaches and salt flats of the Texas Coastal Bend.

Two color photographs of Mammillaria heyderi (also known as nipple cactus or pichilinga), a flowering plant from the Cactus family found on various soils in pastures and woods of the Texas Coastal Bend.

Two color photographs of the flowers of the Manfreda maculosa plant (also known as Texas tuberose).

Three color photographs of Marsilea macropoda (also known as pepperwort), a fern from the Pepperwort family found in swales, ditches, and other low or damp places.

One color photograph of Medicago polymorpha, (also known as bur-clover), an annual flowering plant from the Pea family found in waste places and along roads.

Three color photographs of Melia azedarach (also known as chinaberry), a deciduous tree from the Mahogany family found in stream bottoms, ditches, and waste places.

Two color photographs of Merremia, (also known as alamo vine), a perennial vine from the Morning-Glory family found in stream bottoms, coastal thickets, shell deposits, and waste places.

Six color photographs of Monanthochloe littoralis, a plant from the Grass family.

Two color photographs of Monarda citriodora (also known as horsemint), an annual flowering plant from the Mint family found commonly on clay soils in prairies, openings, and waste places.