Mark William Bierner

Hymenoxys hoopesii (formerly Dugaldia hoopesii) is a species of flowering plant in the daisy family known by the common names owl's claws, orange sneezeweed, and yerba del lobo. It is native to the western United States, where it grows in habitats of moderate elevation, such as mountain meadows in the Rocky Mountains, Sierra Nevada, southern Cascades, and other ranges. It has been found from Arizona, New Mexico, and central California north as far as Montana and Oregon. H. hoopesii is an erect perennial herb growing up to about 1 meter (40 inches) in height, with smooth-edged leaves up to 30

Hymenoxys ambigens is a species of flowering plant in the daisy family known by the common name Pinaleño Mountains rubberweed. It is native to the states of Arizona and New Mexico in the southwestern United States. Hymenoxys ambigens is a perennial herb up to 150 cm (5 feet) tall. Leaves have very narrow lobes resembling branching threads. One plant can produce an array of 25–400 small yellow flower heads, each head with 3-5 ray flowers and 6–15 disc flowers. Varieties Hymenoxys ambigens var. ambigens - Mescal, Pinaleño, and Santa Teresa Mountains in Arizona Hymenoxys ambigens var. floribunda

Hymenoxys jamesii is a North American species of flowering plant in the daisy family known by the common name James's rubberweed. It has been found only on the Mogollon Plateau of Arizona in the southwestern United States. Hymenoxys jamesii is a perennial herb up to 120 cm (4 feet) tall. One plant can produce sometimes as many as 330 flower heads in a branching array. Each head has 7–9 ray flowers and 30–75 tiny disc flowers.

Helenium chihuahuense is a North American perennial plant in the sunflower family. It has been found only in the state of Chihuahua in northwestern Mexico. Helenium chihuahuense is a branching annual herb up to 78 cm (31.2 inches) tall with thick rootstocks producing only one stem with a single flower head. The leaves are long, narrow and irregularly lobed. The head is spherical or egg-shaped, with many disc flowers, each yellow with purple tips. These are surrounded by about 14-15 yellow ray flowers.

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Helenium apterum is a North American perennial plant in the sunflower family. It has been found only in the state of Durango in northwestern Mexico. Turner, B. L. 2013. The comps of Mexico. A systematic account of the family Asteraceae (chapter 11: tribe Helenieae). Phytologia Memoirs 16: 1–100 Helenium apterum is a perennial herb up to 100 cm (40 inches) tall with thick rootstocks producing only one stem with a single flower head. Leaves at the base can be up to 30 cm (1 foot) long, the leaves higher on the stem much smaller. The head is about 4 cm (1.6 inches) across, with a hemispherical

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