Dudleya parva | |
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Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Order: | Saxifragales |
Family: | Crassulaceae |
Genus: | Dudleya |
Species: | D. parva |
Binomial name | |
Dudleya parva Rose & Davidson | |
Synonyms [2] | |
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Dudleya parva, known by common name as the Conejo dudleya, is a species of deciduous succulent plant native to the Conejo Valley and surrounding regions. It blooms from May to June, and has vernal leaves. It is only found from the western end of Simi Hills along the Montclef Ridge to the Conejo Grade in Newbury Park. [3] [4] [5]
This species of Dudleya is an especially unique taxa, as it possesses several characteristics intermediate within the genus. It was previously thought Dudleya were organized into three subgenera; Dudleya, Stylophyllum, and Hasseanthus. It was thought that Dudleya and Hasseanthus were the most distant from each other, and that Stylophyllum occupied an intermediate space. Dudleya were thought to have evergreen leaves and habit, while Hasseanthus were classified with a deciduous, geophytic habit. Dudleya parva, however, was originally classified in the subgenera Dudleya, but it presents several traits of Hasseanthus. It has summer deciduous leaves, and a rhizomatous habit. It is also unusual among Dudleya in that it may be rooted from the leaves, which has only been recorded among other Hasseanthus-type Dudleya. [6]
Arising from stems may be multiple rosettes, at most several, each 1 to 6 cm wide. The roots are narrowed and swollen at irregular intervals, with rhizome-like branches extending from the roots of the plant. The rhizomes often resemble shriveled roots for most of the year, and are very fragile. The rhizomes are not a good character for field identification. Because the plant is rhizomatous, the above-ground parts of the plant may die back for several years, surviving underground as a rootstock. It is a long-lived species, with some examples surviving over 24 years in cultivation. [6] [7]
The stems are 2 to 7 mm wide. The leaves are deciduous in summer, and are 1.5 to 4 cm long, 3 to 6 mm wide, and shaped oblanceolate, glaucous in youth, but papery when dry. The base of the leaves is a wounding purple to red. The peduncle of the inflorescence is 4 to 23 cm tall, and 1 to 5 mm wide. The lower bracts are 5 to 15 mm, and the inflorescence branches once or twice. The petals are yellow, and the keel is often flecked with red. [7]
The 2n chromosome number is 34. [7]
The entire species is located over a 16 km stretch of land on an east-west ridgeline of Conejo volcanics, on the western end of the Simi Hills, along Mountclef Ridge, and terminating near Conejo Grade. This distribution only covers an area of around several hundred acres. The population boundaries exhibits some annual fluctuations, but otherwise it has remained in the same suitable habitat area for some time. The rugged terrain makes tracking populations difficult, along with the summer deciduous habit. [6]
It is typically found on north-facing cliffs of the Conejo volcanics, and on the adjacent grassland. [7]
This species is threatened by land development and recreational activity. A significant portion of the land that this species occurs on is designated as "open space" by the Conejo Open Space Conservation Agency, or on parklands managed by Ventura County. The remaining habitat is either owned by local governments, or is privately owned land. An increase in the number of hikers, tramplers and invasive species has damaged the population. Many of the sites occurring on private land cannot be adequately surveyed. [6]
Dudleya, commonly known as liveforevers is a genus of rosette-forming succulent plants in the stonecrop family, Crassulaceae, consisting of about 68 taxa in southwestern North America and Guadalupe Island. The species come in many forms, with some large and evergreen, others geophytic and deciduous. Yet, despite their dramatic variations in appearance, most species readily hybridize. The flowers of Dudleya have parts numbered in fives, with the petals arranged in tubular, star-shaped, and bell-shaped forms and, when fruiting, are filled with tiny, ovoid-crescent-shaped seeds.
Dudleya abramsiisubsp. setchellii, known by common name as the Santa Clara Valley dudleya or Santa Clara Valley liveforever, is a member of the Dudleya genus of succulent perennials, members of the family Crassulaceae. The Santa Clara Valley dudleya, endemic to the Santa Clara Valley region in the southern San Francisco Bay Area, was listed on 3 February 1995, as an endangered species. It is considered to be a subspecies of Dudleya abramsii, but its taxonomic status is still unclear. Its closest relative is Dudleya cymosa subsp. paniculata, which is a morphologically similar sister taxon.
Dudleya cymosa is a species complex of evergreen and deciduous succulent plants in the family Crassulaceae known by the common name: canyon liveforever. It is a loosely defined polyphyletic species with a diverse number of subspecies, varying highly in morphology, distribution, and habitat.
Dudleya blochmaniae is a summer-deciduous succulent plant known by the common names Blochman's liveforever or Blochman's dudleya. This species of Dudleya survives part of the year with no aboveground presence, surviving as underground corm-like roots in deciduous months. It is characterized by white, star-shaped and spreading flowers that emerge after sufficient rainfall. It is found along the Pacific coast of the California Floristic Province, from the vicinity of San Luis Obispo in California to Punta Colonet in Baja California.
Dudleya abramsiisubsp.calcicola is a succulent plant known by the common name limestone liveforever, or limestone dudleya. It is endemic to California, where it is a rare resident of limestone outcroppings and rocky slopes in the southern Sierra Nevada and nearby mountains and foothills. It was formerly regarded as Dudleya calcicola.
Dudleya lanceolata is a succulent plant known by the common name lanceleaf liveforever or lance-leaved dudleya. It is an extremely variable and widely ranging species that occurs from Monterey County and Kern County in California south through Ensenada in Baja California. It is characterized by green to purple lanceolate leaves, red, orange, or less commonly yellow petals, and is typically tetraploid. Despite its diversity, it is quite stable as a species, but hybrids may be discovered with other species of Dudleya, which can make it difficult to discern in areas where numerous species converge.
Dudleya multicaulis is a succulent plant known by the common name manystem liveforever or many-stemmed dudleya. This Dudleya is endemic to southern California, where it is rare and seriously threatened as its habitat is altered by humans. Many occurrences of this species have been extirpated. This species is characterized by a few short, fingerlike cylindrical leaves with pointed tips, and its erect peduncle, which is topped with a branching inflorescence bearing up to 15 flowers on each long, thin branch. The flowers, which appear in late spring, have pointed yellow petals and long stamens. It is usually found on heavy clay or rocky soils and outcrops.
Dudleya traskiae is a rare succulent plant known by the common name Santa Barbara Island liveforever. This Dudleya is endemic to Santa Barbara Island, one of the Channel Islands of California, where it grows on rocky bluffs. The plant has a basal rosette of flat, spade-shaped fleshy leaves up to 15 centimeters long, which are pale green to yellowish. It erects tall stems bearing dense, rounded inflorescences of many bright yellow flowers.
Dudleya brevifolia, is a rare succulent plant known by the common name short-leaved liveforever, short-leaved dudleya or rarely the Del Mar Hasseanthus. It is an edaphic endemic that only grows on Lindavista formation marine terraces, on surfaces with ironstone nodules. The leaves are deciduous, and disappear after the inflorescence develops. The small white flowers are star-shaped with a yellow center. After flowering, any above ground trace of the plant will disappear, and it survives under the earth with a starch-rich subterranean caudex. Dudleya brevifolia is only found on coastal mesas along a small strip of coast in San Diego County, California.
Dudleya abramsii is a species complex of succulent plants native to California and parts of Baja California. There are numerous subspecies, some critically endangered, with varying habits and lifestyles, but most often characterized by a smaller size, yellow flowers, and an affinity for rocky habitats. The subspecies may be polyphyletic.
Dudleya variegata is a deciduous succulent plant in the family Crassulaceae known by the common names variegated liveforever, variegated dudleya or rarely San Diego Hasseanthus. A cryptic plant that survives part of the year dormant underground from starch reserves in a corm, after sufficient rainfall, leaves will emerge, soon giving way to small inflorescences with yellow star-shaped flowers. It is native to Baja California and adjacent San Diego County in California, where it grows in several habitat types, including chaparral and vernal pools.
Dudleya gnoma is a rare species of succulent plant in the stonecrop family known by the common names munchkin liveforever and munchkin dudleya. It is characterized by its diminutive stature, small yellow flowers, and distinctive white rosettes. It is endemic to the eastern portion of Santa Rosa Island, one of the Channel Islands of California, where it is known from one population at the type locality, containing three colonies of plants.
Dudleya abramsii subsp. abramsii is a species of succulent plant in the family Crassulaceae known by the common name as Abrams' liveforever. It is a small, delicate plant found growing among rocks, and is characterized by yellow flowers with a red tinge that emerge from May to July. It is native to the southern Sierra Nevada of California and the Peninsular Ranges across both the United States and Mexico.
Dudleya abramsii subsp. affinis, commonly known as the San Bernardino Mountains Dudleya, is a subspecies of succulent plant endemic to a portion of the San Bernardino Mountains in California. It is a plant with an unbranching stem and elliptical leaves occurring in Green Canyon and the nearby plateaus.
Dudleya cymosa subsp. paniculata, known by the common name Diablo Range dudleya, is a species of perennial succulent plant in the family Crassulaceae native to the Inner South Coast Range of California. It is characterized by pale yellowish flowers, oblong to oblanceolate leaves and a growth habit not limited to a single substrate. It is closely related to Dudleya abramsii subsp. setchellii.
Dudleya cymosasubsp. costatifolia, known commonly as the Pierpoint Springs dudleya or the Pierpoint Springs liveforever, is a species of succulent plant in the family Crassulaceae, narrowly endemic to a locality in Tulare County, California, United States. It is a clumping plant with small rosettes and bright yellow flowers, resembling alpine cushion plants.
Dudleya cymosasubsp. pumila, most commonly known as the low canyon dudleya, chalky canyon dudleya or California live-forever, is a species of perennial succulent plant. It has diamond to spoon shaped leaves, sometimes coated with a fine white powder, and in May through July, bright red, orange or yellow flowers adorn the short inflorescence. A leaf succulent primarily found growing in rocky cliffs and slopes, it is endemic to California, and grows in the Transverse Ranges and South Coast Ranges, with some outlying populations. A variable plant, in some localities it is difficult to distinguish from other plants in the genus.
Dudleya saxosasubsp. aloides is a species of perennial succulent plant in the family Crassulaceae known by the common names desert dudleya or desert savior. It is a rosette-forming species widely distributed throughout the Peninsular Ranges and desert mountains of California in the United States. It is characterized by bright-yellow or greenish-yellow flowers, and can be found in shaded crevices and slopes. Plants in western half of the range may grade into Dudleya lanceolata.
Dudleya cymosa subsp. marcescens is a species of summer-deciduous succulent plant known commonly as the marcescent dudleya or marcescent liveforever. Throughout the months of spring, it is characterized by a bloom of small, bright-yellow flowers with 5 petals, tinged with orange or red. It is a leaf succulent with a basal rosette, with the foliage withering in summer, going completely leafless, a neotenous trait in the genus. This species is endemic to the exposed volcanic rock of the Santa Monica Mountains in California, being found on shady slopes and outcroppings. It differs from its local congeners with its deciduous habit, slender caudex, and narrower leaf shape, although it is superseded in some of these characteristics by Dudleya parva, growing 13 km to the north, which has even narrower leaves and is quicker to lose them. Because of its restricted distribution and small size, it is vulnerable to habitat degradation and disturbance from acts of graffiti and rock climbers. It is listed as threatened by the United States Fish and Wildlife Service.
Dudleya cymosasubsp. agourensis, commonly known as the Agoura Hills dudleya or Agoura Hills liveforever, is a species of perennial succulent plant. A rare and critically imperiled species from the Santa Monica Mountains in California, it is characterized by glaucous, gray-purple leaves, bright yellow flowers, and ascending bracts. A leaf succulent, it is found growing on west to northwest-facing open, rocky volcanic slopes.
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