Dudleya linearis

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Dudleya linearis
Dudleya linearis imported from iNaturalist photo 63698566 on 4 October 2021.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Saxifragales
Family: Crassulaceae
Genus: Dudleya
Species:
D. linearis
Binomial name
Dudleya linearis
(Greene) Britton & Rose
Synonyms [1]
  • Cotyledon linearisGreene
  • Echeveria linearis(Greene) A.Berger

Dudleya linearis is an insular succulent plant known by common name as the San Benitos Liveforever. It is endemic to the San Benito Islands, a small group of Mexican islands in the Pacific Ocean, west of Cedros Island. The population was almost wiped out by rabbits introduced to the island.

Contents

Description

Morphology

Dudleya linearis possesses a thick and fleshy caudex, crowned on top by a rosette of tightly packed leaves. The leaves are light green and broadly linear, acuminate and 3 to 7.5 cm long, 6 to 9 mm thick. Bracteate flowering stems 1 to 1.5 cm long emerge from the plant, bearing a glaucous inflorescence consisting of 2 or 3 secund racemes. The flowers are suspended by pedicels that are up to 4 mm long. The calyx of the flower is segmented into 5 sepals, which are ovate-lanceolate, acute, and about 5 mm long. The corolla is a greenish-yellow, 8 to 9 mm long, with its tube shorter than the calyx. [2]

Taxonomy

Taxonomic history

Dudleya linearis was discovered by a Lieutenant Pond, [3] and described by Edward Lee Greene in 1889 as Cotyledon linearis. [4] Nathaniel L. Britton & Joseph N. Rose of the New York Botanical Garden later classified the plant as Dudleya linearis. [2]

Distribution and habitat

Dudleya linearis is endemic to West Benito Island, in the San Benito Islands, an archipelago west of Cedros Island. [5]

Conservation

The San Benito Islands are otherwise uninhabited except for the seldom few fishermen who may camp overnight. There are two manmade structures on the island, a small lighthouse tower in the south, and a large lighthouse on the northwest end. [6] In 1991, rabbits were brought to island, possibly by the lighthouse keeper or fishermen. The rabbits devastated the population of D. linearis, nearly to the point of extirpation, until in 1998, when a hunter with a Jack Russel Terrier known as "Freckles" was hired to eliminate the rabbits. The elimination of the rabbits, along with an El Niño year, lead to the rebound of the D. linearis population. [7]

Related Research Articles

<i>Dudleya</i> North American succulent genus

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.

<i>Dudleya abramsii <span style="font-style:normal;">subsp.</span> setchellii</i> Species of succulent

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.

<span class="mw-page-title-main">Islas San Benito</span> Island group of Baja California, Mexico

The Islas San Benito lie in the Pacific Ocean off the west coast of the Mexican state of Baja California, 25 km west of Cedros Island. They are part of the Cedros Island delegación, a subdivision of Ensenada (municipality), Baja California.

<i>Dudleya candelabrum</i> Species of succulent

Dudleya candelabrum is a species of succulent plant known by the common names candleholder liveforever or candleholder dudleya. Endemic to California, this species grows wild only on the northern Channel Islands, where it is found in open rocky places and north-facing slopes. It is characterized by thin, spade-shaped green leaves and an inflorescence covered in long, reflexed bracts, with pale yellow flowers. It has been threatened by poachers shipping plants to South Korea.

<i>Dudleya farinosa</i> Species of succulent

Dudleya farinosa is a species of succulent plant in the family Crassulaceae known by several common names, including bluff lettuce, powdery liveforever, and powdery dudleya. A coastal plant of northern California and southern Oregon, it is typically found on oceanic bluffs just directly above the reach of the waves. Its appearance is characterized by lotus-like rosettes of beveled leaves, and in summer the plant erects a tall pink to red stem densely covered in foliage, topped with branches adorned with pale yellow flowers. The green or white rosettes of this plant can be seen covering stretches of rocky coast and nearby islets.

<i>Dudleya greenei</i> Species of succulent

Dudleya greenei is a perennial species of succulent plant known by the common names Greene's liveforever, or Greene's dudleya. It is endemic to the Channel Islands of California, where it grows along the cliffs of four of the eight islands. It is a highly variable plant, presenting with multiple forms and varying levels of ploidy. Taxonomically, this species is an insular segregate of Dudleya caespitosa, and was placed as a stopgap taxon by Reid Moran in his 1951 thesis on the genus. It is characterized by white or green leaf rosettes, loomed over by inflorescences bearing pale yellow to white flowers. It is a member of the subgenus Dudleya, as it cannot be propagated from leaf cuttings, does not grow from a corm, and has tight petals.

<i>Dudleya variegata</i> Species of succulent

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.

<i>Dudleya brittonii</i> Species of succulent plant found in Mexico

Dudleya brittonii, with the common names Britton's dudleya, Britton's liveforever and giant chalk dudleya, is a succulent plant in the family Crassulaceae. It is native to the coast of northern Baja California, Mexico. Both forms of the plant have yellow leaves on a clustered rosette atop a large reddish-purple peduncle. The white form of the plant has a chalky epicuticular wax that reflects light and reacts with water. The green form of the plant is more common and found throughout a wider range. It is among the largest of the Dudleya.

<i>Dudleya ingens</i> Species of succulent

Dudleya ingens is a species of perennial succulent plant in the family Crassulaceae commonly known as the rock liveforever or Baja liveforever. A relatively large member of the genus Dudleya, this species has long green succulent leaves, and in April to June is characterized by pale yellow to white pink-tinged flowers topping tall, reddish inflorescences. It has a stem clothed densely with old, leathery leaves, and the inflorescence may be nodding, with the floral branches bearing the flowers tending to unfurl like the fronds of a fern. It is similar in appearance to Dudleya brittonii, but differs in range and chromosome number. This species is endemic to the state of Baja California in Mexico, being found from Santo Tomás to the southern coast of the state.

<i>Dudleya guadalupensis</i>

Dudleya guadalupensis is a very rare species of succulent perennial plant in the family Crassulaceae commonly known as the Guadalupe liveforever. It is a rosette-forming leaf succulent, with foliage that is variously colored light green, green, and a waxy white. It is characterized by dense leaves that fold over the center in dormancy, a curving, sinuous flower stalk, and white, cup-shaped flowers. It is endemic to the rocks and islets off of Guadalupe Island, an isolated volcanic island in the Pacific Ocean located 241 kilometers off of the coast of Baja California.

<i>Dudleya pauciflora</i> Species of succulent

Dudleya pauciflora is a species of succulent plant in the stonecrop family known by the common name few-flower liveforever. It is characterized by its small crowded rosettes of narrow leaves and its colorful inflorescence with red-yellow flowers. Found growing on rocky outcrops and cliffs in the high elevation mountains of the Sierra de San Pedro Martir and the Sierra de San Borja, it is endemic to the state of Baja California, Mexico.

<i>Dudleya pachyphytum</i> Species of succulent plant

Dudleya pachyphytum is an insular succulent plant known by the common name Cedros Island liveforever. It is a member of the genus Dudleya, in the family Crassulaceae. Characterized by thick, blunt leaves covered in a white, powdery wax and adorned by white flowers in bloom, it is regarded as one of the most attractive and charismatic members of its genus. It is endemic to the foggy northern end of Mexico's Cedros Island, occupying an ecological niche shared with the Cedros Island Pine.

<i>Dudleya rubens</i> Succulent plant species from Baja California Sur

Dudleya rubens is a species of succulent perennial plant in the family Crassulaceae known by the common name as the San Francisco liveforever, native to the mountains of Baja California Sur. It is a rosette-forming plant with waxy leaves, characterized by branching stems and dull red to apricot flowers. It is only found above 500 metres (1,600 ft) in the Sierra de San Francisco and the Sierra de la Giganta ranges in Baja California Sur, primarily on north-facing volcanic slopes.

<i>Dudleya saxosa <span style="font-style:normal;">subsp.</span> collomiae</i>

Dudleya saxosa subsp. collomiae, known by the common name Gila County liveforever, is a subspecies of perennial succulent plant within the genus Dudleya native to central Arizona. It is characterized by showy bright-yellow flowers on an upright inflorescence colored pink, red or orange. The leaves are green or covered in a white, powdery wax. This species is found growing in rocky slopes, canyons, and crevices, and often on Sonoran Desert sky islands.

<i>Dudleya acuminata</i> Species of succulent

Dudleya acuminata is a species of succulent perennial plant in the family Crassulaceae known by common name as the Vizcaino liveforever. A rosette-forming leaf succulent, it has reddish yellow flowers that emerge from April to May. It is native to the Pacific coast of the Vizcaino Desert on the Baja California Peninsula, and on neighboring islands.

<i>Dudleya nubigena</i> Species of succulent plant from Mexico

Dudleya nubigena is a species of succulent plants in the family Crassulaceae. It is a rosette forming perennial with flattish leaves. Endemic to southern Baja California Sur, the species is found in the Sierra de la Laguna and the surrounding lowlands, and on Cerralvo Island.

<i>Dudleya albiflora</i> Species of succulent

Dudleya albiflora, known by the common name white-flower liveforever, is a species of succulent perennial plant in the family Crassulaceae. It is native to the Baja California Peninsula. This species represents numerous populations with varying chromosome numbers scattered around the peninsula, but all share broad, common morphological traits such as white flowers and narrow leaves.

<i>Dudleya cymosa <span style="font-style:normal;">subsp.</span> paniculata</i> Species of succulent plant

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.

<i>Dudleya saxosa <span style="font-style:normal;">subsp.</span> saxosa</i> Plant species

Dudleya saxosasubsp. saxosa is a species of succulent perennial plant endemic only to the western Panamint Range of California. It is known commonly as the Panamint liveforever or Panamint dudleya. It is found on north-facing, granitic or limestone slopes and grows up to 20 cm wide. It is characterized by bright yellow, red tinged flowers, which bloom from May to June.

Dudleya virens subsp. extima is a subspecies of succulent plant in the family Crassulaceae commonly known as the Guadalupe green liveforever. It is a rosette-forming leaf succulent, with both green and white waxy foliage. It has white flowers with spreading petals that bloom from May to June. It is a somewhat small plant, continuing a southward trend of decreasing size relative to other Dudleya virens subspecies. This plant is endemic to Guadalupe Island in the eastern Pacific Ocean, which is 241 kilometers off of the Baja California coast. It is very rare, with this plant only surviving on sheer cliff faces and canyons, out of the reach of the former feral goat population rampant on the island. It closely resembles a miniature version of Dudleya virens subsp. virens, but it may be more nearly related to the local Dudleya guadalupensis.

References

  1. "Dudleya linearis". Global Biodiversity Information Facility . Retrieved 22 August 2021.
  2. 1 2 Britton, Nathaniel Lord (1903). "Dudleya linearis". Bulletin of the New York Botanical Garden. 3 (9): 16 via crassulaceae.com.
  3. "Lieut. Pond; Index of Botanists". Harvard University Herbaria Database. Retrieved 22 August 2021.
  4. Greene, Edward Lee (1889). "Cotyledon linearis" (PDF). Pittonia. 1: 285–286 via crassulaceae.com.
  5. Rebman, J. P.; Gibson, J.; Rich, K. (2016). "Annotated checklist of the vascular plants of Baja California, Mexico" (PDF). San Diego Society of Natural History. 45: 133.
  6. Rowlett, Russ (June 2002). "Lighthouses of Mexico: Northwestern Baja California". The Lighthouse Directory. University of North Carolina at Chapel Hill. Archived from the original on 2018-04-22. Retrieved 22 August 2021.
  7. Akpan, Nsikan (3 October 2014). "Climbing high to save a threatened West Coast plant". Science News. Retrieved 22 August 2021.