W. Dennis Clark

Hazardia vernicosa is a Mexican species of shrub in the family Asteraceae. It has been found only in the state of Baja California in northwestern Mexico, specifically near El Rosario. It has not been found in the United States although one of the Mexican populations is less than 10 km (6+1⁄4 miles) south of the international border. Hazardia vernicosa is a branching subshrub up to 45 cm (18 in) tall with several stems arising from a woody underground caudex. The plant produces numerous flower heads each head with 3-5 yellow disc flowers plus 3-5 ray flowers.

Hazardia rosarica is a species of flowering shrub in the family Asteraceae commonly known as the El Rosario goldenbush. Hazardia rosarica is a fragrant shrub characterized by its zigzagged branches, toothed glutinous leaves, and yellow flower heads of only disc flowers. This species is endemic to Mexico and is only found in the region near of the town of El Rosario in Baja California. It is usually found on north and east facing slopes and ridgetops close to the coast.

Hazardia ferrisiae is a Mexican species of shrub in the family Asteraceae. It has been found only in the state of Baja California in northwestern Mexico. Hazardia ferrisiae grows on the coastal plain on the Pacific side of the peninsula. The plant produces flower heads singly or in small clusters of 2 or 3, each head with 5-6 disc flowers but no ray flowers.

Adiaphila brickellioides is a species of shrub in the family Asteraceae known by the common name brickellbush goldenweed. It is native to the Mojave Desert of California and Nevada, where it grows in rocky limestone habitat. Adiaphila brickellioides is a shrub producing a stem 20–80 centimetres (7.9–31.5 in) tall which is coated in rough hairs often tipped with yellowish resin glands. The hairy, leathery leaves are oval, up to about 3.5 centimetres (1.4 in) long, and usually lined with spiny teeth. The plant produces several flower heads each roughly a centimeter (0.4 inches) wide when open.

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