Overview

Brief Summary

Genus Overview

There are a number of characteristics which can be summarized regarding the Dudleya genus. Genus occurrences are restricted to southwest North America; in fact, according to Low, approximately 98 percent of genus occurrences are along or near the coasts of Baja California, (the states of Baja Sur and Baja Norte in Mexico), plus the northward extension into the USA in the states of California and southern Oregon. A small number of genus populations are found in Arizona and possibly Nevada. The center of genus diversity is the coastal region where Mexico and the USA meet. Dudleyas have a strong affinity for the coastal regions, but some species have ranges that extend into the nearby mountains and deserts.

Most species of Dudleya grow at elevations near sea level, but a few grow on or even atop mountains of Baja California, the high Sierra Nevada and in many other California mountain ranges. Many, such as D.cymosa, prefer canyon locations on vertical or near vertical rocky walls, often in the shade, surviving in very little soil in the crevices of almost solid rock. Sometimes the occurrences are in locations that receive no direct sunlight. Almost all Dudleya species have succulent leaves arranged into rosettes. Because of this rosette geometry many genus members are striking in their visual appeal. Many, including the Canyon Liveforever, have leaves that are glaucous (covered with a whitish or bluish waxy coating) or frosty looking.

The chromosome count of all Dudleya species is n=17, with about 35% of all populations consisting of polyploids (individuals with multiples of the base number). Remarkably, according to extensive crossing experiments conducted by Verity, all Dudleya taxa are capable of hybridizing in nature.

There are eight recognized subspecies of D. cymosa (flower color in parentheses):

  • D. cymosa subsp. agourensis K.M.Nakai: Canyon Liveforever (bright yellow)
  • D. cymosa subsp. crebrifolia K.M.Nakai & Verity: San Gabriel River dudleya (mustard yellow)
  • D. cymosa subsp. costafolia Bartel & Shevock: Pierpoint Springs Dudleya (bright yellow)
  • D. cymosa subsp. cymosa: Canyon Liveforever, the nominate subspecies (bright yellow, red or orange)
  • D. cymosa subsp  marcescens Moran: Marescent Dudleya (bright yellow with orange or red markings)
  • D. cymosa subsp  ovatifolia: (Britton) Moran Santa Monica Mountains Dudleya (bright yellow, rarely with red or orange marking)
  • D. cymosa subsp. paniculata: (Jeps.) K.M.Nakai (pale yellow-white to pale yellow-pink)
  • D. cymosa subsp. pumila: (Rose) K.M.Nakai (bright yellow or red)
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:4Public Records:4
Specimens with Sequences:4Public Species:3
Specimens with Barcodes:4Public BINs:0
Species:3         
Species With Barcodes:3         
          
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Wikipedia

Dudleya

Dudleya is a genus of succulent perennials, consisting of about 45 species in southwest North America.

Many plants in the Dudleya genus were formerly classified as Echeveria.

The fleshy and glabrous leaves[citation needed] occur in basal rosettes, in colors generally ranging from green to gray. The inflorescences are on vertical or inclined stems up to a meter high, but usually much shorter, topped by a cyme with alternate leaf-like bracts. Both the petals and sepals of the small flowers are five in number and fused below. Five pistils, also fused below, have 10 stamens arranged around them.

Dudleya species are widespread in their range, typically found in rock outcroppings, cliff faces, or road cuts, where their leaves help them store water in a setting too dry for most types of plants. Most are small and inconspicuous when not in bloom.

The genus is named after William Russell Dudley, the first head of the botany department at Stanford University.

In horticulture, Dudleya should be planted at an angle. This allows accumulated water to drain from the nestlike center of the plant, thus preventing microbial decay.

Selected species[edit]

Munchkin dudleya
Dudleya gnoma

References[edit]

  1. ^ Dodero, M. W. and M. G. Simpson. (2012). Dudleya crassifolia (Crassulaceae), a new species from northern Baja California, Mexico. Madroño 59(4) 223-229.

Further reading[edit]

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