Amos Arthur Heller

Delphinium luteum, known by the common name yellow larkspur, is a species of small perennial herb in the buttercup family bearing bright yellow cornucopia-shaped flowers. Endemic to the rocky, foggy hillsides of coastal Sonoma County, California, it is critically endangered, with about 200 individuals believed to be in existence as of 2005. The plant was never distributed beyond the coastal area of Sonoma and Marin counties, and has never been abundant. Activities in the area including quarrying, grazing, agriculture, and development further reduced the population of yellow larkspur to its

Juglans major (literally, the larger walnut), also known as Arizona walnut, is a walnut tree which grows to 50 ft tall (15 m) with a DBH of up to 0.61 metres (2 ft) at elevations of 300–2,130 m (1,000–7,000 ft) in Texas, Oklahoma, New Mexico, Arizona, and Utah. It also occurs in Mexico as far south as Guerrero. Common names include Arizona black walnut (as it belongs to the "black walnuts" section Juglans sect. Rhysocaryon), and the Spanish name nogal cimarrón (cimarron walnut).

Rosa pinetorum is an uncommon species of rose known by the common name pine rose. It is endemic to California, where it occurs in the coniferous forests of the Central Coast Ranges around Monterey Bay.

Phyllodoce breweri is a species of flowering plant in the family Ericaceae known by the common names purple mountain heath and Brewer's mountain heather. It is native to California, where it can be found in mountain ranges including the southern Cascade Range, the San Bernardino Mountains, and the Sierra Nevada, its distribution extending into Nevada. It grows in rocky subalpine mountain habitat, such as slopes and meadows.

Cephalanthera austiniae is a species of orchid known as the phantom orchid and snow orchid because the entire plant is white except for a few yellow markings on the flowers. The orchid is native to the western United States (California, Oregon, Washington and Idaho), and to British Columbia, Canada. Cephalanthera austiniae is the only species of genus Cephalanthera native to the Western Hemisphere. This is also the only Cephalanthera species entirely dependent on symbiotic mycorrhizae for its nutrition. This mycoheterotrophic orchid has no chlorophyll, so it makes no energy for itself.

Verbena macdougalii is a species of verbena known by several common names, including MacDougal verbena, New Mexico vervain, hillside verbena, and spike verbena. It is a perennial herbaceous flowering plant in the verbena family (Verbenaceae). V. macdougalii is the most common tall verbena in New Mexico, where it can be found in mountainous regions across the state. It also occurs in Arizona, Utah, Colorado, and west Texas. Verbena macdougalii grows at elevations of 5,900 to 9,000 feet in open flats, valleys, and in disturbed areas such as roadsides. It produces three or more tall, thick

Salix eastwoodiae is a species of willow known by the common names mountain willow, Eastwood's willow, and Sierra willow. It was first described by Bebb in 1879 as Salix californica. This name was later found to be illegitimate, as Lesquereux had given the same name to a fossil willow in 1878. It is native to California, Nevada, and the north-western United States. It grows in subalpine and alpine climates in mountain habitats such as talus and streambanks.

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Lupinus nevadensis is a species of lupine known by the common name Nevada lupine. It is native to the western Great Basin in Nevada and adjacent sections of Oregon and California, where it grows in sagebrush and other typical basin habitat. It is an erect perennial herb growing 10 to 40 centimeters tall. Each palmate leaf is made up of 6 to 10 hairy leaflets up to 5 centimeters long. The stem and herbage are coated in long hairs. The inflorescence is a spiral of flowers each around 1 centimeter in length. The flower is blue with a whitish patch on its banner and a curved keel. The fruit is a

Kalmia microphylla, known as alpine laurel, bog laurel, swamp-laurel, western bog-laurel or western laurel, is a species of Kalmia of the family Ericaceae. It is native to North America and can be found throughout the western US and western and central Canada below the subarctic.

Cheirodendron trigynum, also known as ʻŌlapa or common cheirodendron, is a species of flowering plant in the ginseng family, Araliaceae, that is endemic to Hawaii. It is a medium-sized tree, reaching a height of 12–15 m (39–49 ft) and a trunk diameter of 0.6 m (2.0 ft). ʻŌlapa inhabits mixed mesic and wet forests at elevations of 310–2,190 m (1,020–7,190 ft) on all main islands, where it is an abundant understory tree.

Aloysia wrightii is a species of flowering plant in the verbena family known by the common names Wright's beebrush and oreganillo. It is native to the Sonoran Desert of southwestern United States and northern Mexico, where it can be found in moist desert canyons, scrub, and woodland habitat. This is a thickly branching shrub which reaches nearly two meters in maximum height and is generally rounded in form. It has small, oval-shaped to nearly round leaves each no more than two centimeters long. The leaves have lightly toothed edges and hairy undersides. The inflorescence is a narrow, woolly

Agastache cusickii is a species of flowering plant in the mint family known by the common name Cusick's giant hyssop. It is native to the northwestern United States from eastern Oregon and central Nevada to Idaho and Montana. This perennial herb grows 10 to 20 centimeters tall from a woody taproot and caudex. Some of the stems spread horizontally underground. It has leaves covered in fine hairs and the fruits are nutlets. The spikelike inflorescence bears flowers with purple-tipped sepals and white corollas each about a centimeter long with protruding stamens. Blooming occurs in June through

Trifolium trichocalyx is a species of clover known by the common name Monterey clover.

Fritillaria micrantha, the brown fritillary or brown bells, is a Californian species of flowering plant in the lily family Liliaceae.

Aquilegia desertorum, the desert columbine, is a perennial species of flowering plant in the family Ranunculaceae, native to the Southwestern United States.

Toxicoscordion micranthum, the smallflower deathcamas, is a flowering plant in the genus Toxicoscordion. It is native to Oregon and California, primarily in the Coast Ranges from Douglas County to Napa and Sonoma Counties, with isolated populations in Lassen, Plumas, Santa Clara, and San Benito Counties. It is a member of the serpentine soils flora. Toxicoscordion micranthum is a bulb-forming herb up to 70 cm tall and bearing as many as 60 flowers. Flowers are white or cream-colored, sometimes with green markings, 5–12 mm in diameter hence smaller than most of the other species in the genus.

Toxicoscordion exaltatum the giant deathcamas, is a North American flowering plant in the genus Toxicoscordion, reputed to be deadly poisonous. It is native to California, Oregon, and Nevada, where it can be found in the Sierra Nevada foothills.

Tonella tenella is one of two herbaceous plant species in genus Tonella, which has been recently reclassified as a member of the family Plantaginaceae. This species is known by the common names lesser baby innocence and small-flowered tonella. The plant is a small annual herb with an erect stem up to 30 centimeters tall. The flowers are very tiny, only a few millimeters wide. The corolla is arranged with four petal lobes on one side and one larger petal lobe on the other. The lobed petals are white with blue or purple spots or streaks, and they surround four white stamens. Growing in the

Penstemon triflorus, Heller's beardtongue or Heller's penstemon, is a penstemon notable for its showy, purple blossoms.

Lupinus obtusilobus is a species of lupine also known by the common names bluntlobe lupine and satin lupine. It is native to high mountains of northern California, including the North Coast Ranges, the Klamath Mountains, and the northernmost Sierra Nevada. It grows in various types of mountain habitat, sometimes carpeting meadows with its purple blooms in the spring. It is a perennial herb growing erect or decumbent along the ground, its stem 15–30 centimetres (5.9–11.8 in) long. Each palmate leaf is made up of 6 to 7 leaflets up to 5 centimetres (2.0 in) long. The herbage is coated in

Lupinus flavoculatus is a species of lupine known by the common name yelloweyes, or yellow-eyed lupine.

Lupinus benthamii is a species of lupine known by the common name spider lupine.

Linum puberulum is a species of flax known by the common name plains flax. It is native to the western and midwestern United States from California to Nebraska to Texas, where it grows in dry, open habitat including desert, semi-desert, hills and low mountains. It is a downy-haired perennial herb producing an erect, branching stem lined with glandular linear leaves up to about 1 centimeter long. The inflorescence is a wide open cyme of golden yellow to yellow-orange flowers each with five petals 1 to 1.5 centimeters in length. The fruit is a capsule about 4 millimeters wide.

Hydrophyllum tenuipes, Pacific waterleaf or slender-stemmed waterleaf, is an herbaceous perennial plant native to North America. It is found in western North America from British Columbia to northern California.

Erysimum ammophilum is a species of wallflower known by the common name coast wallflower. It is endemic to California, where it is an uncommon beach-dwelling wildflower. It is known from dunes and bluffs near Monterey Bay, the coastline of San Diego County, and parts of the Channel Islands.

Dichelostemma volubile is a species of flowering plant known by the common names twining snakelily and twining brodiaea. This wildflower is endemic to the mountain foothills of California, where it grows in scrub and woodland. Dichelostemma volubile grows tall, erect, naked stems topped with spherical inflorescences of up to 30 densely packed pink flowers. Each flower is a tube up to a centimeter long with a spreading corolla of six petal-like lobes. The purplish or reddish stems may twine tightly around each other and occasionally other plants.

Agastache occidentalis is a species of Agastache first described by Charles Vancouver Piper, and given its current name by Amos Arthur Heller. It is commonly known as western giant hyssop and giant horsemint.

Valeriana occidentalis is a species of flowering plant in the honeysuckle family known by the common name western valerian. It is native to the western United States, particularly the northwestern quadrant, but it occurs as far south as Arizona and as far east as Colorado and South Dakota. It occurs in moist, forested mountain habitat. It is an erect herb growing 30 to 75 centimeters tall with whorls or opposite pairs of leaves at intervals along stem. The leaves are generally divided into lobes or are compound, with each leaf made up of a few oval-shaped leaflets. The inflorescence is a

Solanum umbelliferum var. glabrescens, commonly known as Parish's nightshade, is a variety of nightshade. It is native to western North America from southern Oregon to north-western Baja California, where it grows in many types of habitat, including maritime and inland chaparral, woodlands, and forests.