Thomas W. Nelson

Lathyrus biflorus is a rare species of wild pea known by the common name twoflower pea. It is endemic to Humboldt County, California, where it is known only from the Mount Lassic Wilderness. It is a member of the serpentine soils flora. This is a petite perennial herb growing thin, tough, fuzzy stems with leaves each made up of two pairs of small linear leaflets. There are tiny bristlelike tendrils. The inflorescence bears two greenish-white pea flowers each up to a centimeter wide. The fruit is a hairless dehiscent legume pod.

Silene salmonacea is a rare, newly described species of flowering plant in the family Caryophyllaceae known by the common names Klamath Mountain catchfly and salmon-flowered catchfly. It is known only from Trinity County, California, where it grows in the forests of the southern Klamath Mountains. It is a member of the serpentine soils flora. It is a small perennial herb growing just a few centimeters tall. The spoon-shaped leaves are up to 3.5 centimeters long. The herbage is gray-green and lightly woolly in texture. Each flower has a tubular calyx of fused sepals lined with ten veins. There

Lupinus constancei is a species of lupine known by the common name The Lassics lupine, or lassicus lupine. It is endemic to the U.S. state of California, where it is known from only fourteen occurrences in the Lassic Range in the North Coast Ranges. It is a member of the serpentine soils flora of the mountain forests. This is a low, mat-forming perennial herb no more than 15 centimeters high. Each small palmate leaf is made up of 6 or 7 leaflets up to 2 centimeters long and one wide. The herbage is coated in long, shaggy hairs. The inflorescence is a small, dense clump of several

Erigeron maniopotamicus is a rare species of flowering plant in the family Asteraceae known by the common name Mad River fleabane. It is endemic to northwestern California, where it is known from only nineteen locations in Humboldt and Trinity Counties. Erigeron maniopotamicus grows in open areas in forest, woodland, and meadow habitat along the path of the Mad River, generally in barren areas without much plant cover. The soils are rocky and tan in color and occur near areas of serpentine soils, but the plant does not occur on the serpentine soil. Erigeron maniopotamicus was described to

Potentilla paniculata, also known as Ash Creek mousetail and Ash Creek ivesia, is a species of flowering plant in the rose family. It is endemic to the Modoc Plateau of Lassen and Modoc Counties in the northeastern corner of California, where it is known only from the vicinity of Ash Valley. It was first described in 1981.

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Silene serpentinicola is a rare species of flowering plant in the family Caryophyllaceae known by the common name serpentine Indian pink and serpentine catchfly. It was described to science in 2004. It is currently known only from Del Norte County, California, where it is an endemic of the serpentine soils of the Smith River basin. It probably also occurs north of the border in Oregon. It is a resident of chaparral and coniferous forest habitat among other serpentine endemics.

Harmonia stebbinsii (syn. Madia stebbinsii) is a species of flowering plant in the family Asteraceae known by the common name Stebbins' tarweed, or Stebbins' madia. It is endemic to northern California, where it is limited to the Klamath Mountains and adjacent slopes of the North Coast Ranges. It is a member of the serpentine soils plant community in these mountains, found at elevations of 1100–1600 meters. It is a rare annual herb producing a bristly stem up to about 25 centimeters tall studded with black resin glands. Its bristly leaves grow up to about 2 centimeters long and are mostly

Harmonia doris-nilesiae is a species of flowering plant in the family Asteraceae known by the common names serpentine tarweed and Niles' madia. This plant was first described in science in 1985, when it was named Madia doris-nilesiae after the California botanist and teacher Doris Niles. It and several others were moved to the new genus Harmonia in 1999.

Sabulina stolonifera is a rare species of flowering plant in the pink family known by the common names Scott Mountain sandwort and stolon sandwort. It is endemic to Siskiyou County, California, where it is known from only two occurrences in the Scott Mountains of the Klamath Range. It is a member of the serpentine soils flora in the area, growing amidst Jeffrey Pines with other rare local plants such as the Mt. Eddy lupine (Lupinus lapidicola).

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