Lasthenia conjugens | |
---|---|
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Asterids |
Order: | Asterales |
Family: | Asteraceae |
Genus: | Lasthenia |
Species: | L. conjugens |
Binomial name | |
Lasthenia conjugens | |
Lasthenia conjugens, commonly known as Contra Costa goldfields, is an endangered species of wildflower endemic to a limited range within the San Francisco Bay Area of the state of California, USA. [1] Specifically this rare species occurs in Napa, [2] Santa Barbara, [3] Solano, Contra Costa, Santa Clara, Monterey and Alameda Counties. [4] This annual herb typically flowers from March through June, and its colonies grow in vernal pool habitats at elevations not exceeding 100 meters above sea level. The Jepson Manual notes that the present distribution is limited to the deltaic Sacramento Valley, principally Napa and Solano Counties, [5] but the historic range of L. conjugens [4] is known to be significantly wider. In any case, historically the range has included parts of the North Coast, Sacramento Valley, and San Francisco Bay Area [6] as well as the South Coast. Alternatively and less frequently this taxon has been referred to as Baeria fremontii var. conjugens.
Even though this plant is found almost exclusively in vernal pools, its behavior in controlled experiments indicates it prefers less than complete inundation. This implies that the plant actually prefers a theoretically drier environment, but is merely less successful than its competitors in surviving in drier (non-inundation) climate regimes. [7]
Lastenia conjugens is an herb whose stems are simple or freely branched and erect, attaining a height of less than 40 centimeters. Their glabrous leaves, of length of approximately eight centimeters, are entire to pinnately lobed. Inflorescences appear in the form of solitary heads, with twelve to eighteen phyllaries fused at one third to less than mid length, a distinguishing hallmark for identification of this species. [8] An involucre structure measures six to ten millimeters and may be somewhat hemispheric. The receptacle presents as dome-shaped or obconic. The yellow ray flowers may number six to thirteen petals, and the five to ten millimeter ligules are yellow as well. The yellow disk flowers are numerous, and anther tips are linear to somewhat ovate. Style tips are triangular. The corollae are typically five-lobed. Style tips may be triangular or round, but typically hair-tufted. The glabrous club-shaped fruits are less than 1.5 millimeters across, black or gray in color, absent a pappus structure. The species is cross-pollinated. [9] According to Greene, the chromosome characteristic is: 2n=12.
Lasthenia conjugens relies upon insect pollination for fertilization, and dispersal of seed is largely by gravity. In undisturbed habitats, this and other species of Lasthenia are pollinated by specialist bee species, primarily in the genus Andrena . [10] Studies in Solano County natural and restoration habitats have shown variability between visitation rates to the two types of colonies; however, plant propagation rates were found to be similar between natural colonies and introduced ones, implying pollination is not a limiting factor of propagation. [11] An alternative conclusion is that members of one particular insect family, Sciaridae, are also efficient pollinators of L. conjugens, since it was the only insect family to visit the restoration colonies in significant numbers (the specialist bees are absent from these areas).
The population trend for L. conjugens is one of declining numbers as well as shrinking range. According to Jepson, [5] the historic range includes areas not in the present range: parts of the North Coast, more eastern reaches of the Sacramento Valley, more southerly parts of the San Francisco Bay Area and parts of the South Coast. Moreover, the U.S. Fish and Wildlife Service alludes to historic populations in Contra Costa County and Santa Clara County. [4] More specifically another source defines the extended historic San Francisco Bay Area range to have extended from Richmond to Palo Alto [6] By the year 1995 the populations of L. conjugens had declined to the point where there were only five colonies extant, all of which were within Napa and Solano Counties. [12]
Contra Costa Goldfields has been studied extensively with regard to genetic diversity of colonies. Some early findings were that repeated seedings in restoration colonies enhanced the resultant population of Lasthenia conjugens and hence ultimate survival. [13] The subsequent finding has been made that genetic diversity has been able to be replicated for introduced colonies in a restoration environment, implying favorable long-term stability and viability for introduced colonies. [14]
In addition to the federal status as an endangered species it gained on June 18, 1997, Lasthenia conjugens is acknowledged and protected under the Solano County Habitat Conservation Plan (HCP). [15] The Solano County Habitat Conservation Plan encourages corridor preservation among vernal pool habitats, which are essential for this species' survival; in addition the HCP states the importance of recognizing genetic differences amongst various colonies of L. conjugens in order to protect the total species genetic diversity. Contra Costa goldfields is not listed by the State of California as endangered. [16]
Vernal pools, also called vernal ponds or ephemeral pools, are seasonal pools of water that provide habitat for distinctive plants and animals. They are considered to be a distinctive type of wetland usually devoid of fish, and thus allow the safe development of natal amphibian and insect species unable to withstand competition or predation by fish. Certain tropical fish lineages have however adapted to this habitat specifically.
The grass Tuctoria mucronata, which is known by several common names including prickly spiralgrass, Solano grass, and Crampton's tuctoria, is a federally listed endangered plant species endemic to two counties in northern California.
Holocarpha macradenia, commonly known as the Santa Cruz tarplant, is an endangered plant endemic to Northern California. Alternative common names for this plant are Santa Cruz tarweed or Santa Cruz sunflower.
Limnanthes vinculans, the Sebastopol meadowfoam, is an endangered species of meadowfoam found only in the Laguna de Santa Rosa in Sonoma County, California, United States and an area slightly to the south in the Americano Creek and Washoe Creek watersheds. The name vinculans derives from the Latin root vinculum, meaning "a bond, a cord." The specific epithet vinculans means linking or bonding, in reference to the sharing of some characters of L. vinculans with L. douglasii (R.Br) and L. bakeri.
The Delta green ground beetle is a species of ground beetle restricted to a small region within Solano County, California. Its color is a metallic-green, usually with bronze spots on its elytra, though some lack these spots. The lack or reduction of circular pits on the elytra helps distinguish it from other ground beetles. Typical adults are about a quarter-inch (0.6 cm) in length.
Lasthenia, commonly known as goldfields, is a genus of the botanical family Asteraceae. The genus is named after Lasthenia of Mantinea, a cross-dressing female pupil of the ancient Greek philosopher Plato.
Eriophyllum latilobum or San Mateo woolly sunflower is a perennial herb of sharply limited range, endemic and occurring only in the state of California, United States. This flowering plant of the family Asteraceae has been listed as an endangered species by the U.S. federal government as well as the state of California.
Trifolium amoenum, known by the common names showy Indian clover and two-fork clover, is endemic to California, and is an endangered annual herb that subsists in grassland areas of the San Francisco Bay Area and the northern California Coast Ranges.
Legenere limosa is an annual wildflower of the bellflower family endemic to limited portions of Northern California. This species is the sole member of the genus Legenere. The species common name is false Venus's looking glass or Greene's legenere.
The midvalley fairy shrimp, Branchinecta mesovallensis, is a small freshwater crustacean in the Branchinectidae family endemic to shallow ephemeral pools near the middle of California's Central Valley. These vernal pool ecosystems are home to other unique organisms adapted to the ephemeral nature of the water cycle in the pools in California's mediterranean climate.
Lasthenia burkei is a rare species of flowering plant in the daisy family known by the common names Burke's goldfields and Burke's baeria.
The Loch Lomond Vernal Pool Ecological Reserve is a nature reserve of 8.22 acres (33,300 m2) in the community of Loch Lomond in Lake County, California. It is one of 119 ecological reserves managed by the California Department of Fish and Game (CDFG). The ecological reserve system was authorized by the state legislature in 1968 for the purpose of conservation and protection of rare plants, animals and habitats.
Lasthenia chrysantha is a species of flowering plant in the daisy family known by the common name alkalisink goldfields. It is endemic to the California Central Valley, where it grows in vernal pools and alkali flats.
Lasthenia ferrisiae is a species of flowering plant in the daisy family known by the common name Ferris' goldfields. It is endemic to the California Central Valley, where it grows in vernal pools and alkali flats.
Lasthenia glabrata is a North American species of flowering plant in the daisy family known by the common names yellowray goldfields and yellow-rayed lasthenia. It is endemic to California, where it is a resident of vernal pools and other moist areas in a number of habitat types. It is widespread across much of the state, from San Diego County to Tehama County.
Blennosperma bakeri is a rare species of flowering plant in the daisy family known by the common names Baker's stickyseed and Sonoma sunshine.
Brodiaea filifolia, known by the common name threadleaf brodiaea, is a rare species of flowering plant in the cluster-lily genus. It is endemic to southern California, mostly in the region around the junction of Orange, Riverside, and San Diego Counties.
Calochortus pulchellus is a rare species of flowering plant in the lily family known by the common name Mt. Diablo fairy-lantern or Mount Diablo globelily.
Trichostema ruygtii, with the common name Napa bluecurls, is a species of flowering plant in the mint family. It was first described to science in 2006.
Deinandra conjugens is a rare species of flowering plant in the aster family known by the common names Otay tarplant and Otay tarweed. It is native to a small section of far northern Baja California in Mexico, its range extending north into San Diego County, California, in the United States. One isolated population has been reported from the hills east of Cayucos in San Luis Obispo County.