Dudleya densiflora is a species of succulent plant in the family Crassulaceae known commonly as the San Gabriel Mountains liveforever or San Gabriel Mountains dudleya.[3] A very rare plant confined to the San Gabriel Mountains of Los Angeles County, California, it is known only from three to five spots in the mountain range, with an estimated 1,700 individual plants remaining. Growing in the cracks of the granite slopes of three canyons in this single mountain range, it is threatened by human activity such as rock quarrying and off-trail recreation.[1]
A clumping plant with long, pencil-shaped and powdery leaves, with a branching, rounded inflorescence that holds spreading, white to pink flowers. The flowers emerge from spring to June. It is similar in appearance to Dudleya edulis and Dudleya viscida, but differs in having white powdery leaves and a rounded, not flat-topped, inflorescence.[4][5]
Morphologyedit
This plant grows in a caespitose or clumping habit, with multiple rosettes of leaves forming on top of branching caudices. The caudex is 1–2.5 cm (0.39–0.98 in) wide. The clumps of rosettes may reach up to 30 cm (12 in) in diameter, and have a foliage consisting of 20 to 40 leaves. The evergreen foliage is covered in a white, waxy powder, known as an epicuticular wax, with the leaf blades green underneath the substance. The base of the leaf may turn a yellow when the leaf is wounded. Each leaf is 6–15 cm (2.4–5.9 in) long by 6–12 mm (0.24–0.47 in) wide, more or less cylindric, with a linear shape. The tip of the leaf is shaped acute.[4][5]
The peduncle is 10–30 cm (3.9–11.8 in) tall, and 2–6 mm (0.079–0.236 in) wide. The floral shoots are covered in 5 to 15 bracts, which are erect and shaped lanceolate. The inflorescence branches 3 to several times, with each branch sometimes dividing into one or two more terminal branches. The terminal branches are 2–4 cm (0.79–1.57 in) long and bear 2 to 8 flowers, suspended on pedicels 2–5 mm (0.079–0.197 in) long. The flowers are spreading from the middle, the sepals shaped deltate to ovate. The petals are 5–10 mm (0.20–0.39 in) long, with a narrowly ovate shape, and are colored a white or pink. The entire corolla is around 12–20 mm (0.47–0.79 in) in diameter.[4][5]
Distribution and habitatedit
This species is restricted to a small locality in southern California, in the United States. It is found growing at the southern base of the San Gabriel Mountains, in an area near the mouth of San Gabriel Canyon and Fish Canyon. The habitat of this species consists of sheer rock faces, cliffs, and canyon walls, usually composed of granitic rock.[4][5]
Dudleya densiflora is threatened by human activity encroaching on its habitat. A notable disturbance is the presence of a granite quarry operating for the community of Azusa, with the permit for the quarry issued in 1956, before most environmental laws existed. The quarry also blocks the entrance to Fish Canyon, which was formerly accessible as a trail maintained by the Forest Service.[6] In Fish Canyon, this species can also be found growing with another Dudleya endemic to the locality, Dudleya cymosa subsp. crebrifolia.[7]
^"Dudleya densiflora". Calflora. Berkeley, California: The Calflora Database. Retrieved February 26, 2022.
^ abcdFlora of North America Editorial Committee (ed.). "Dudleya densiflora". Flora of North America North of Mexico (FNA). New York and Oxford: Oxford University Press – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
^ abcdMcCabe, Stephen Ward (2012). "Dudleya densiflora". Jepson eFlora. Jepson Flora Project. Retrieved February 26, 2022.
^Hudson, Berkley (28 Feb 1993). "Clash Over the Quarry : At Fish Canyon's Majestic Waterfall, Rivals Find Some Common Ground". Los Angeles Times. Retrieved 4 April 2022.
^Spath, Jeremy (September 2014). "The Rapidly Evolving World of Dudleyas" (PDF). Fremontia. 42 (3). California Native Plant Society: 2–6. Retrieved 4 April 2022.
External linksedit
Jepson Manual Treatment - Dudleya densiflora
USDA Plants Profile - Dudleya densiflora
Dudleya densiflora - Photo gallery
January 01, 1970
dudleya, densiflora, species, succulent, plant, family, crassulaceae, known, commonly, gabriel, mountains, liveforever, gabriel, mountains, dudleya, very, rare, plant, confined, gabriel, mountains, angeles, county, california, known, only, from, three, five, s. Dudleya densiflora is a species of succulent plant in the family Crassulaceae known commonly as the San Gabriel Mountains liveforever or San Gabriel Mountains dudleya 3 A very rare plant confined to the San Gabriel Mountains of Los Angeles County California it is known only from three to five spots in the mountain range with an estimated 1 700 individual plants remaining Growing in the cracks of the granite slopes of three canyons in this single mountain range it is threatened by human activity such as rock quarrying and off trail recreation 1 Dudleya densiflora Plants on a cliff with flowering inflorescences Conservation status Imperiled NatureServe 1 Scientific classification Kingdom Plantae Clade Tracheophytes Clade Angiosperms Clade Eudicots Order Saxifragales Family Crassulaceae Genus Dudleya Species D densiflora Binomial name Dudleya densiflora Rose Moran Synonyms 2 Cotyledon densiflora Rose Jeps Cotyledon nudicaulis Abrams Dudleya nudicaulis Munz Moran Echeveria densiflora Rose A Berger Echeveria nudicaulis Munz Stylophyllum densiflorum Rose Stylophyllum nudicaule Munz Abrams Contents 1 Description 1 1 Morphology 2 Distribution and habitat 3 Gallery 4 See also 5 References 6 External linksDescription editA clumping plant with long pencil shaped and powdery leaves with a branching rounded inflorescence that holds spreading white to pink flowers The flowers emerge from spring to June It is similar in appearance to Dudleya edulis and Dudleya viscida but differs in having white powdery leaves and a rounded not flat topped inflorescence 4 5 Morphology edit This plant grows in a caespitose or clumping habit with multiple rosettes of leaves forming on top of branching caudices The caudex is 1 2 5 cm 0 39 0 98 in wide The clumps of rosettes may reach up to 30 cm 12 in in diameter and have a foliage consisting of 20 to 40 leaves The evergreen foliage is covered in a white waxy powder known as an epicuticular wax with the leaf blades green underneath the substance The base of the leaf may turn a yellow when the leaf is wounded Each leaf is 6 15 cm 2 4 5 9 in long by 6 12 mm 0 24 0 47 in wide more or less cylindric with a linear shape The tip of the leaf is shaped acute 4 5 The peduncle is 10 30 cm 3 9 11 8 in tall and 2 6 mm 0 079 0 236 in wide The floral shoots are covered in 5 to 15 bracts which are erect and shaped lanceolate The inflorescence branches 3 to several times with each branch sometimes dividing into one or two more terminal branches The terminal branches are 2 4 cm 0 79 1 57 in long and bear 2 to 8 flowers suspended on pedicels 2 5 mm 0 079 0 197 in long The flowers are spreading from the middle the sepals shaped deltate to ovate The petals are 5 10 mm 0 20 0 39 in long with a narrowly ovate shape and are colored a white or pink The entire corolla is around 12 20 mm 0 47 0 79 in in diameter 4 5 Distribution and habitat editThis species is restricted to a small locality in southern California in the United States It is found growing at the southern base of the San Gabriel Mountains in an area near the mouth of San Gabriel Canyon and Fish Canyon The habitat of this species consists of sheer rock faces cliffs and canyon walls usually composed of granitic rock 4 5 Dudleya densiflora is threatened by human activity encroaching on its habitat A notable disturbance is the presence of a granite quarry operating for the community of Azusa with the permit for the quarry issued in 1956 before most environmental laws existed The quarry also blocks the entrance to Fish Canyon which was formerly accessible as a trail maintained by the Forest Service 6 In Fish Canyon this species can also be found growing with another Dudleya endemic to the locality Dudleya cymosa subsp crebrifolia 7 Gallery edit nbsp A young plant growing on a rocky face nbsp A plant with a single rosette growing on moss nbsp A large clump of a plant nbsp Growing out of a cliff face nbsp Growing in habitatSee also editDudleya multicaulis Dudleya cymosa subsp crebrifolia Dudleya viscidaReferences edit a b Dudleya densiflora NatureServe Explorer Arlington Virginia NatureServe 2022 Retrieved February 26 2022 Dudleya densiflora Plants of the World Online Royal Botanic Gardens Kew Retrieved February 26 2022 Dudleya densiflora Calflora Berkeley California The Calflora Database Retrieved February 26 2022 a b c d Flora of North America Editorial Committee ed Dudleya densiflora Flora of North America North of Mexico FNA New York and Oxford Oxford University Press via eFloras org Missouri Botanical Garden St Louis MO amp Harvard University Herbaria Cambridge MA a b c d McCabe Stephen Ward 2012 Dudleya densiflora Jepson eFlora Jepson Flora Project Retrieved February 26 2022 Hudson Berkley 28 Feb 1993 Clash Over the Quarry At Fish Canyon s Majestic Waterfall Rivals Find Some Common Ground Los Angeles Times Retrieved 4 April 2022 Spath Jeremy September 2014 The Rapidly Evolving World of Dudleyas PDF Fremontia 42 3 California Native Plant Society 2 6 Retrieved 4 April 2022 External links editJepson Manual Treatment Dudleya densiflora USDA Plants Profile Dudleya densiflora Center for Plant Conservation Profile Dudleya densiflora Photo gallery Retrieved from https en wikipedia org w index php title Dudleya densiflora amp oldid 1122152655, wikipedia, wiki, book, books, library,
