Dieter H. Wilken

Ipomopsis sancti-spiritus is a rare species of flowering plant in the phlox family known by the common name Holy Ghost ipomopsis. It is endemic to New Mexico in the United States, where it is known from only one canyon in the Sangre de Cristo Mountains. It is a federally listed endangered species. This plant was first described in 1988, when specimens were found to differ slightly from the description of the very similar Ipomopsis aggregata. The species is known only from a two-mile (3-km) stretch of Holy Ghost Canyon in San Miguel County, northern New Mexico. Though estimates of the

Thalictrum heliophilum is a species of flowering plant in the buttercup family known by the common names Cathedral Bluff meadow-rue and sun-loving meadow-rue. It is endemic to Colorado in the United States, where it is known from three counties. This perennial herb grows from rhizomes and fibrous roots. It produces one to three stems up to half a meter tall. The leaves are divided into leathery, waxy-textured leaflets each tipped with three teeth. The species is dioecious. The terminal inflorescence is a panicle of many flowers. The flower has four tiny sepals and no petals. The fruit is an

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