Arthur Herman Holmgren

Euphorbia aaron-rossii, also known as the Marble Canyon spurge, is a perennial, herbaceous plant species of Euphorbia native to Arizona. It's most closely related to E. strictior and E. wrightii, but needs more study.

Allium passeyi is a plant species endemic to Box Elder County in northwestern Utah. It grows in shallow, stony locations at elevations of 1400–1600 m. Allium passeyi produces 2-3 round to egg-shaped bulbs, each up to 2 cm in diameter. Flowers are bell-shaped, up to 9 mm in diameter; tepals pink; pollen yellow.

Primula capillaris is a rare species of flowering plant in the primrose family known by the common name Ruby Mountains primrose, or Ruby Mountain primrose. It is endemic to Nevada in the United States, where it is limited to the Ruby Mountains of Elko County. This small plant is a few centimeters tall, growing from a short rhizome. The thick, hairless leaves are linear or somewhat lance-shaped, 1 to 6 centimeters long and no more than half a centimeter wide with rounded tips. The delicate, showy flower has a bell-shaped calyx of green sepals. The corolla is reddish or bluish purple with a

Lewisia maguirei is a rare species of flowering plant in the family Montiaceae known by the common name Maguire's lewisia, or Maguire's bitterroot. It is endemic to Nevada in the United States, where it is known only from eastern Nye County.

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