Plant Search Results

Arabis hoffmannii

Less than 150 plants in 3 populations are known to exist. Two populations each have less than 5 reproductive plants annually. The remaining population may have as many as 30 reproductive individuals in any one year. Although reproductive plants produce many fruits and seeds, most of the seeds are d....

Arenaria paludicola

Once found in Pierce County, Washington and from San Francisco Bay to the San Bernardino Valley in California, marsh sandwort today is known from fewer than three localities, and its numbers have dwindled to perhaps less than perhaps 50 individuals. As early as 1915, marsh sandwort was considered t....

Astragalus pycnostachyus var. lanosissimus

Less than 50 plants are known to exist, represented by a single population. The population occurs on an abandoned oil-field waste site, which has been proposed for reclamation and development as a residential community. Historic records suggest that this variety occurred near coastal marshes or bodi....

Berberis pinnata ssp. insularis

Although once known from three California Channel Islands, island barberry survives today at only 3 known localities on Santa Cruz Island, perhaps represented by only 1-3 plants in each. Intensive sheep and cattle grazing for over 150 years contributed to its loss on Santa Rosa Island. The last rema....

Calycadenia villosa

Dwarf Calycadenia is a summer-flowering annual up to 30 cm tall, with a basal rosette of many, grayish, simple leaves. Each plant can produce from 1 to 15 heads with 1-4 white to pinkish ray flowers and 10 to 15 disk flowers. Most populations are composed of plants with a single, simple to distally ....

Chlorogalum purpureum var. purpureum

Purple amole is a bulbous perennial with 3-7 basal spreading leaves. Each plant produces a central naked inflorescence 25-50 cm tall, which bears 7-30 flowers. Purple amole has a fragmented distribution with less than 500 documented sites or "populations" distributed within 4-5 disjunct areas. Abou....

Chlorogalum purpureum var. reductum

Camatta Canyon amole is a bulbous perennial with 3-7 basal, spreading leaves, 1-5 ascending inflorescences 10 - 20 cm tall, and flowers with 6 bluish purple sepals and petals. This variety is known from only 2 sites, separated by over 5 km. Most of the plants occur in one area of about 2-3 hectare....

Dudleya brevifolia

The short-leaved dudleya is a small, rare succulent perennial plant that produces a rosette of leaves from a corm. White flowers with red or purple markings are borne on short stalks. Proposed for Federal protection in 1993, this species was removed from the candidate list in 1996, as it is one of....

Dudleya nesiotica

Santa Cruz Island liveforever occupies an area of about 13 hectares (32 acres) on the west end of Santa Cruz Island. Plants are summer dormant, surviving by means of corms 10-30 mm in diameter. Leaves appear after the first winter rains and senesce coincident with flowering in April and May. Each ....

Eriodictyon capitatum

Shrub less than 3 m tall. Twigs glabrous and sticky. Linear, entire leaves to 9 cm with rolled margins. Upper leaf surface sticky, lower tomentose. Head-like inflorescence, with funnel-shaped, lavender corolla and linear, hairy calyx.

Fremontodendron mexicanum

Fremontodendron mexicanum is a tree like shrub with bright orange flowers that bloom between March and August. The showy plant is often used as an ornamental shrub in gardens. Currently, fewer than 100 individuals are known from sites in two areas, southern San Diego County and Estado de Baja Califo....

Helianthemum greenei

Flowers have 5 bright yellow petals and are about 2 cm in diameter. One-year-old plants with 1-5 flowers may be only 10-15 cm tall. However, mature plants may reach 0.5 m in height, producing up to 100 flowers on multiple branches, and may live for up to 10 years. The minute, black, globose seeds, l....

Lupinus nipomensis

The total number of known plants has varied from between 100 and approximately 1,800 plants per year, depending on winter rainfall. Plants are distributed as a series of small colonies on the Guadalupe Dunes near the southwest edge of Nipomo Mesa in San Luis Obispo County, California. The primary t....

Pogogyne clareana

Santa Lucia mint is a delicate, strongly scented annual up to 40 cm tall with dense terminal clusters of deep pink flowers 10-15 mm long. It occurs along small ephemeral streams and in vernal pools. It was listed as Endangered by the State of California in 1979, based on reports of a few thousand in....

Rorippa gambelii

Once found from San Luis Obispo County south to San Bernardino County, California, and in central Mexico, Gambels watercress today is known from only three localities in the United States, and its numbers have dwindled to perhaps less than 300 individuals. Known from about 8 occurrences in the Unit....

Schwalbea americana

A tall, perennial herb in the figwort family, this plant is distinguished by its large, purplish-yellow, tubular flowers. Schwalbea americana is a hemiparasite that feeds from the roots of a range of associated woody species. Once known historically from the coastal plain extending from Massachuse....

Thermopsis macrophylla

Fewer than 2500 plants survive within a relatively narrow band about 3 miles long along the crest of the central Santa Ynez Mountains in Santa Barbara County, California. Current populations consist of plants similar in age and may be several decades old, because seeds germinate only after historica....