David R. Morgan

Chloracantha is a monotypic genus of flowering plants in the aster family, containing the single species Chloracantha spinosa. It is distributed in the southwestern and south-central United States (CA NV AZ UT NM TX OK LA), most of Mexico, and much of Central America. Its English language common names include spiny chloracantha, spiny aster, devilweed aster, and Mexican devilweed. In Spanish it is known as espina de agua, espinaza, and espinosilla. This species is a perennial herb or subshrub; its green stems look more herbaceous than woody, "but it behaves more like a subshrub", with its

Xylothamia, the desert goldenrods, is a formerly accepted genus of flowering plants in the family Asteraceae. Until 2003, it was held to contain nine species of shrubs native to the deserts of Mexico and the southwestern United States. As of May 2024, Plants of the World Online divided the nine former species of Xylothamia among Aquilula, Gundlachia, and Medranoa.

Xanthisma coloradoense (syn. Aster coloradoensis, Machaeranthera coloradoensis) is a species of flowering plant in the family Asteraceae known by the common name Colorado tansyaster. It is native to Colorado and Wyoming in the United States. This cushion plant is a perennial herb growing from a taproot and branching caudex. It grows up to 14 centimeters tall, with several to many thick, hairy stems. The hairy leaves are lance-shaped to spatula-shaped and the edges are lined with large, sharp teeth tipped with bristles. The inflorescence is a solitary flower head with narrow, white-tipped

Xanthisma spinulosum, the spiny goldenweed, is a species of flowering plant of the genus Xanthisma native to western North America. Xanthisma spinulosum grows in dry, sandy hot openings, cooler woodlands, and can be found blooming in the spring, summer, or fall.

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Dieteria bigelovii, also known as Bigelow's tansyaster or sticky aster, is a North American species of plants in the family Asteraceae.

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Xanthisma junceum is a species of flowering plant in the family Asteraceae known by the common names rush bristleweed or rush-like bristleweed. It is native to northern Mexico and it occurs in the United States only as far north as San Diego County, California. It grows in coastal and inland slopes and canyons. It is a perennial herb growing erect to 1 m in height. The linear leaves are mostly located at the base of the plant, each 1–2 cm long and toothed or cut into bristle-tipped lobes. The inflorescence bears one or more flower heads lined with glandular, bristle-tipped phyllaries. The

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Toiyabea granitica, common names granite serpentweed and Lone Mountain serpentweed, is a rare endemic plant species known only from the east side of Lone Mountain in Esmeralda County, Nevada, about 20 km (12.5 miles) west of Tonopah. It grows there in the crevices of granitic outcrops. Toiyabea granitica is a perennial herb growing close to the ground and forming mats. Leaves are ovate to spatulate, irregularly toothed, up to 4 cm (1.6 inches) long. Flower heads are born in racemose or corymbiform arrays. There are no ray flowers, but up to 23 yellow disc flowers.

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Tonestus peirsonii is a local-endemic species of flowering plant in the family Asteraceae known by the common names Inyo tonestus, Peirson's serpentweed and Peirson's tonestus.

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