Dudleya traskiae

Santa Barbara Island liveforever

Critically Imperiled  (NatureServe)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Saxifragales
Family: Crassulaceae
Genus: Dudleya
Species:
D. traskiae
Binomial name
Dudleya traskiae
Natural range of Dudleya traskiae
Synonyms[1]
  • Stylophyllum traskae Rose
  • Cotyledon traskae Fedde
  • Echeveria traskae Berger

Dudleya traskiae (originally spelled Dudleya traskae[1][2]) 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.

Description

The flowers.

Dudleya traskiae is a perennial succulent herb with foliage leaves in a basal rosette. The plants are evergreen, with a branched primary stem (caudex) and are composed of one to several hundred rosettes. The branching of the stem is dichotomous. The rosette leaves number 25–35, are strap-shaped - oblanceolate to subacuminate and are 4–15 cm long and 1–4 cm wide. Leaves may be green or glaucous with a waxy covering. The flowering stems are axillary and flowering is indeterminate in paniculate or cymose clusters. The petals (5) are bright yellow, often with red veins, fused below and curving outward in the upper half. Stamens (10) are borne on the corolla tube. The fruit is composed of 5 carpels that are spreading in age, 7–8 mm long. Seeds are many and minute, narrow and pointed. Dudleya traskiae is tetraploid with a chromosome number of 34.[3] Flowering most commonly occurs from May–July,[3] although flowering may begin as early as mid-February.[4]

Taxonomy

The first photographs and specimens of this plant were collected by Blanche Trask. Most of Trask's work was destroyed in the 1906 San Francisco Fire, and many of her remaining work was destroyed in a 1915 fire at her herbarium on Santa Catalina.[5] This species was originally placed into the genus Stylophyllum during Nathaniel Lord Britton and Joseph Nelson Rose's revision of North American Crassulaceae.[1]

A botanical illustration of Dudleya traskiae.

W.L. Jepson and Philip A. Munz both synonymized it with nearby species. In 1935, Munz placed it with Stylophyllum albidum (Dudleya virens ssp. virens) and S. insulare (Dudleya virens ssp. insularis) in Echeveria albida. In 1936, Jepson regarded it as a synonym of Echeveria viscida var. insularis (Dudleya virens ssp. insularis). [1]

Subsequent taxonomic work by Reid Moran would place Stylophyllum as a subgenus of Dudleya. Moran disagreed with Jepson and Munz's reduction of the species as a synonym, regarding it as "very distinct." Henceforth, Stylophyllum traskae became Dudleya traskae.[1]

Nomenclature

The plant is named after Blanche Trask, who took the first photographs and collections of the plant.[1] The original spelling traskae is corrected according to the rules of the International Code of Nomenclature for algae, fungi, and plants as of 2011, article 60.[6]

Distribution and habitat

The genus Dudleya is primarily Californian, though it also extends north into southern Oregon, east to central Arizona and southern Nevada, and south to the tip of Baja California, Mexico. Dudleya taxa occur on each of the eight Channel Islands. Dudleya traskiae is known only from Santa Barbara Island, California.[4]

Dudleya traskiae photographed at Regional Parks Botanic Garden located in Tilden Regional Park near Berkeley, CA.

There are ten occurrences on this 652-acre island.[7]

All of the known sites supporting Dudleya traskiae are in rocky areas on the steep slopes of the island's perimeter or on outcrops within shallow canyons where vegetation is low-growing. With the exception of a small population on the far western portion of the island,[8] all locations, historic as well as present day (as of 1989) occur on the eastern, southeastern and southwestern slopes of the island. No Dudleya traskiae plants presently occur on the northern and north-western sides of the island although they do occur elsewhere on north-facing slopes. The habitat of Dudleya traskiae has been described as a maritime cactus scrub, and by Holland (1986)[9] as southern coastal bluff scrub. This assemblage of plants, characterized by cholla (Cylindropuntia prolifera), prickly pear (O. oricola and O. littoralis), boxthorn (Lycium californicum), Santa Barbara Island buckwheat (Eriogonum giganteum ssp. compactum) and annual forbs and grasses, is restricted to the perimeter of the island and south-facing slopes of the canyons.[10]

Conservation

This plant is federally listed as an endangered species of the United States.

It and other native flora were heavily impacted in the 19th century by the presence of hordes of feral goats. The goats were followed by other introduced species, including cats, sheep, New Zealand red rabbits, and Belgian hares.[7]

By 1984 the total number of D. traskiae on the island was about 534. By 2004 the total number was estimated to be around 852. About 80 plants were cultivated and planted in appropriate habitat.[7]

Dudleya traskiae is slow to increase its population due to several factors. Some plants produce few seeds, and some produce few seeds that are viable. Seeds produced are sometimes taken and consumed by deer mice (Peromyscus maniculatus ssp. exilis). On the other hand, when the mice cache the seeds, they may aid in its difficult seed dispersal. Seedlings that successfully emerge are consumed by the mice and by the larvae of owlet moths. Others perished in drought.[7]

Other threats include damage from the activity of nesting brown pelicans, erosion, and introduced plant species.[7]

Conservation efforts include keeping people away from sensitive habitat, performing research, and planting more individuals in the habitat. All the introduced herbivores, including the particularly destructive rabbits and hares, have been removed from the island.[7]

Notes

  1. ^ a b c d e f Reid Venable Moran (1942), "A Revision of Dudleya, Subgenus Stylophyllum - II", Desert Plant Life, 14: 153, archived from the original on 2020-06-10, retrieved 2016-07-09
  2. ^ N. L. Britton & J. N. Rose (1903), "New and Noteworthy North American Crassulaceae", Bulletin of the New York Botanical Garden, 3: 34
  3. ^ a b Moran, R.V. (1951), A Revision of Dudleya, Ph.D. Dissertation, Berkeley, CA: University of California
  4. ^ a b Clark & Halvorson p.19
  5. ^ Daily, Marla. "TRASK, Luella Blanche". Islapedia. Santa Cruz Island Foundation. Retrieved December 7, 2021.
  6. ^ USDA GRIN Taxonomy, retrieved 9 July 2016
  7. ^ a b c d e f USFWS. Dudleya traskiae Five-year Review. January 2008.
  8. ^ Dunkle, M.B. (1950), "Plant Ecology of the Channel Islands of California", Allen Hancock Pacific Expeditions, 13 (3), Los Angeles, CA: University of Southern California Press: 247–386
  9. ^ Unpublished manuscripts cited in Clark & Halvorson p.22
  10. ^ Clark & Halvorson pp.19, 22

References

Parts of this article, including relevant citations, are copied directly from Clark, R. A. and W. L Halvorson. (1989). Status of the endangered and rare plants on Santa Barbara Island Channel Islands National Park Endangered Plant Program, Natural Heritage Division, California Department of Fish and Game, a public domain resource: [1] Archived 2008-04-14 at the Wayback Machine

Read other articles:

Pemilihan umum Gubernur Gorontalo 20242017202927 November 2024 Peta lokasi Gorontalo Gubernur petahanaRusli Habibie dan Idris Rahim Partai Golongan Karya Gubernur terpilih belum diketahui L • BBantuan penggunaan templat ini Pemilihan Umum Gubernur Gorontalo 2024 (selanjutnya disebut Pilgub Gorontalo 2024) dilaksanakan pada 27 November 2024 untuk memilih Gubernur Gorontalo periode 2024-2029.[1] Pemilihan Gubernur (Pilgub) Gorontalo tahun tersebut akan diselenggarakan setelah Pem...

 

2013 SBS Drama AwardsDateDecember 31, 2013SiteSBS Prism Tower in Sangam-dong, SeoulHosted byLee Hwi-jae Lee Bo-young Kim Woo-binProduced byKim Yong-jaeTelevision coverageNetworkSBS ← 2012 SBS Drama Awards 2014 → The 2013 SBS Drama Awards (Korean: SBS 연기대상) is a ceremony honoring the best performances in television on the SBS network for the year 2013. It was held at the SBS Prism Tower in Sangam-dong, Seoul on December 31, 2013, and hosted by Lee Hwi-jae...

 

Сатеніквірм. Սաթենիկ Народилася АланіяРід АрташесідиУ шлюбі з Арташес IДіти Артавазд I і Тигран I  Медіафайли у Вікісховищі Сатенік (вірм. Սաթենիկ, у перекладі з вірменської — Янтарна (вірм. Սաթ — янтар), в аланській традиції Сатана або Шатана)[1] — аланс...

Icon of Saint Ephrem the Syrian (Meryem Ana Kilesesi, Diyarbakır, Turkey). The Prayer of Saint Ephrem (Greek: Ἐὐχὴ τοῦ Ὁσίου Ἐφραίμ, Efchí toú Osíou Efrem), is a prayer attributed to Saint Ephrem the Syrian and used during the Great Lent by the Eastern Orthodox and Byzantine Catholic Churches. In the Byzantine tradition, this prayer is considered to be the most succinct summation of the spirit of Great Lent and is hence the Lenten prayer par excellence, prayed duri...

 

Fuhse-Auwald bei Uetze (Herrschaft) Fuhse im Naturschutzgebiet Fuhse im Naturschutzgebiet Lage Nordwestlich von Uetze, Region Hannover, Niedersachsen Fläche 154 ha Kennung NSG HA 233 WDPA-ID 555734393 FFH-Gebiet 150 ha Geographische Lage 52° 29′ N, 10° 11′ O52.48555555555610.179444444444Koordinaten: 52° 29′ 8″ N, 10° 10′ 46″ O Fuhse-Auwald bei Uetze (Herrschaft) (Niedersachsen) Meereshöhe von 45 m bis 48 m Einr...

 

Herman Flesche (* 21. Oktober 1886 in Rheinbrohl; † 4. Januar 1972 in Braunschweig) war ein deutscher Architekt, Maler, Kunsthistoriker und Schriftsteller. Inhaltsverzeichnis 1 Leben 1.1 Siedlungsbau und Altstadtsanierung 1.2 Werke 2 Literatur 3 Weblinks 4 Einzelnachweise Leben Flesche studierte von 1906 bis 1908 Kunstgeschichte und anschließend bis 1913 Architektur an der Technischen Hochschule Braunschweig. In den Jahren von 1914 bis 1918 nahm er als Soldat am Ersten Weltkrieg teil. 1919...

Місто Магіангл. Magee Координати 31°52′21″ пн. ш. 89°44′00″ зх. д. / 31.87250000002777739° пн. ш. 89.7336100000277809841° зх. д. / 31.87250000002777739; -89.7336100000277809841Координати: 31°52′21″ пн. ш. 89°44′00″ зх. д. / 31.87250000002777739° пн. ш. 89.7336100000277809841° зх. д. / 31...

 

Опис файлу Опис Троїцька церква у Вишняках Хорольського району Полтавщина Джерело http://haidamac.org.ua/2010/02/horol-vyshnyaky/ Час створення 2008 Автор зображення Haidamac Ліцензія self Ліцензування Цей твір поширюється на умовах ліцензії Creative Commons Attribution-Share Alike 3.0 Unported. Коротко: ви мож...

 

Sport discipline RollerSoccer, Futins, Football Skating, Roller FootA practice session between London Fire Rollersoccer playersHighest governing bodyRollerSoccer International Federation, Federation International Football SkatingFirst playedLate 19th centuryRegistered players200CharacteristicsContactYesTeam members5 per sideTypeTeam sport, ball sport, roller sportEquipmentFootball (or soccer ball), inline skates or roller skates, padsVenueRoller rink, 5 a side football court, Outside spo...

American basketball player For his son and former basketball player, see Gerald Henderson Jr. This biography of a living person needs additional citations for verification. Please help by adding reliable sources. Contentious material about living persons that is unsourced or poorly sourced must be removed immediately from the article and its talk page, especially if potentially libelous.Find sources: Gerald Henderson – news · newspapers · books · scholar...

 

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: California species of special concern – news · newspapers · books · scholar · JSTOR (April 2007) (Learn how and when to remove this template message) The western pond turtle is a species of special concern. A species of special concern (SSC or CSC) is a protect...

 

Botol Renew pembersih gigi palsu kekuatan profesional dalam format bubuk Kotak pembersih gigi tiruan semalaman Polident dalam format tablet Pembersih gigi palsu (juga disebut pembersih gigi tiruan) digunakan untuk membersihkan gigi palsu saat keluar dari mulut. Kegunaan utamanya adalah untuk mengontrol pertumbuhan mikroorganisme pada gigi palsu terutama Candida albicans, sehingga dapat mencegah terjadinya stomatitis terkait gigi tiruan. Ketika gigi palsu dipakai di mulut, biofilm berkembang y...

1958 filmThe Violet SellerTheatrical release posterSpanishLa VioleteraItalianLa bella fioraia di Madrid Directed byLuis César AmadoriScreenplay byJesús María de ArozamenaStory by Manuel Villegas López Jesús María de Arozamena André Tabet Produced by Benito Perojo Miguel Tudela Starring Sara Montiel Raf Vallone Frank Villard Tomás Blanco Ana Mariscal CinematographyAntonio L. BallesterosEdited byAntonio Ramírez de LoaysaMusic byJuan QuinteroColor processEastmancolorProductioncompanies ...

 

Sri Lankan Theravada Buddhist monk and scholar Narada Mahatheraනාරද මහා ස්ථවිරයන් වහන්සේMahathera, c. 1920sTitleMahatheraPersonalBorn(1898-07-14)July 14, 1898Kotahena, Colombo, Sri LankaDiedOctober 2, 1983(1983-10-02) (aged 85)ReligionBuddhismNationalitySri LankanSchoolTheravadaLineageAmarapura NikayaEducationSt. Benedict's College, Colombo Part of a series onBuddhism Glossary Index Outline History Timeline The Buddha Pre-sectarian Buddhism Cou...

 

この記事は検証可能な参考文献や出典が全く示されていないか、不十分です。出典を追加して記事の信頼性向上にご協力ください。(このテンプレートの使い方)出典検索?: エバラ家の人々 – ニュース · 書籍 · スカラー · CiNii · J-STAGE · NDL · dlib.jp · ジャパンサーチ · TWL(2016年6月) エバラ家の人々監督 高田大嗣脚本 鴨井達...

Mexican land grant in California Rancho Azusa de Dalton, (originally the Rancho El Susa), was a 4,431-acre (17.93 km2) Mexican land grant in present-day Los Angeles County, California, given in 1841 by Governor Juan Alvarado to Luis Arenas.[1] Arenas sold his Rancho Azusa de Duarte holdings three years later to Henry Dalton (1803–1884), a wealthy merchant from Pueblo of Los Angeles. Dalton named his holding Rancho Azusa de Dalton. Henry Dalton was also called Don Enrique Dalton...

 

Australian musical This article is an orphan, as no other articles link to it. Please introduce links to this page from related articles; try the Find link tool for suggestions. (February 2022) Panawathi Girl is an Australian musical by David Milroy. Set in 1969,[1] the musical concerns a young Aboriginal woman Molly Chubb returning from university studies in Perth to Chubb Springs, her small country hometown in the northwest of Western Australia, to connect with her family and cultur...

 

Japanese manga series This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Attacker You! – news · newspapers · books · scholar · JSTOR (July 2017) (Learn how an...

2014 film by Gillian Greene Murder of a CatTheatrical release posterDirected byGillian GreeneWritten by Christian Magalhaes Robert Snow Produced by Molly Hassell Sam Raimi Gillian Greene Ivan Orlic Starring Fran Kranz Nikki Reed J. K. Simmons Leonardo Nam Blythe Danner Greg Kinnear CinematographyChristophe LanzenbergEdited byEric L. BeasonMusic byDeborah LurieProductioncompanies BabyItsColdOutside Pictures[1] Seine Pictures[1] Hassell-Free Productions[1] Distributed by...

 

The topic of this article may not meet Wikipedia's notability guideline for events. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted.Find sources: 2023 Liechtenstein local elections – news · newspapers · books · scholar ...

 

Strategi Solo vs Squad di Free Fire: Cara Menang Mudah!