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Origin and Habitat: Dudleya gnoma is endemic to Santa Rosa Island (near East Point), one of the Channel Islands of California, where it is known from one single population containing about 3200 plants.
Altitude range: 20-70 metres above sea level.
Habitat and ecology: This species grows in thin, gravelly volcanic soil. The population was discovered in the 1950s and assumed to be a relative of Dudleya greenei, a plant also occurring on the island which is similar but strikingly distinct, larger and contains the same number of chromosomes. The two species are interfertile. The population is protected from nearby grazing cattle by a fence. It still faces threats from deer, which can get past the fence, a limited gene pool, and the fact that a single severe event such as a drought, could eliminate the single population. Currently, the main threat to the Munchkin Dudleya is from potential collecting by hobbyists. The best way to head off this threat is to make garden-grown plants more widely available.
- Dudleya gnoma S.W.McCabe
Dudleya gnoma S.W.McCabe
Madroño 44: 49 1997
- Dudleya gnoma S.W.McCabe
- Dudleya nana R.Moran ex P.H. Thomson
ENGLISH: Munchkin liveforever, Munchkin dudleya, White Sprite
Description: Dudleya gnoma is a rare species of succulent plant in the stonecrop family known by the common names 'munchkin liveforever' and 'munchkin dudleya'. The plant was not described to science until 1997. Though rare in the wild, this dudleya is kept in cultivation by gardeners and enthusiasts of succulents. In gardens it has been known by the illegitimate name Dudleya greenei ‘White Sprite’ or Dudleya greenei forma nana nom.nud.
Habit: This is a compact plant growing from a caudex topped with clumps of leaf rosettes.
Caudexes: Branching apically, (cespitose), 5-26 mm long, 12-20 m wide, axillary branches absent.
Rosettes: 1 to 60 per clump, measuring 8 to 50 mm in diameter and containing (6-)8-15(-20) small leaves.
Leaves: Fleshy triangular-ovate, spreading, (6-)5-10(-20) mm long, (4-)5-6(-13) mm wide, 2-4 mm thick, base 7-15 mm wide, , apex acute, green, red-tinged, or white with waxy, powdery coating of exudate and heavily glaucous.
Inflorescence: Cymose, up to about 13 cm tall bearing up to 10 flowers. Cymes 2-branched, broadly obpyramidal or flat-topped; branches not twisted (flowers on topside), simple or 1 times bifurcate; cincinni 2-6, 3-7-flowered, circinate, 1-3 cm long; floral shoots 2.5-13 cm long and studded with small triangular leaves. Pedicels erect, not bent in fruit, 1-3 mm long.
Flowers: Less than a centimeter long and containing yellow petals. Calyx 3-4 mm long, 4-5 mm in diameter. Petals basally united for 1-1.5 mm, pale to medium yellow, 9-10 long, 2-3 mm wide, apex acute, tips slightly outcurved. Pistils connivent, erect.
Blooming season: Late spring.
Fruits (follicles): Unripe follicles erect.
Chromosome number: 2n = 68.
Bibliography: Major references and furter lectures
1) Stephens, T. "Arboretum helps protect rare island succulents." UC Santa Cruz Currents October 30, 2000. <http://currents.ucsc.edu/00-01/10-30/dudleya.html>
2) McCabe, S. (1997). "Dudleya gnoma (Crassulaceae): A new species from Santa Rosa Island." Madroño 44 48-58.
3) PLANTS Profile for Dudleya gnoma “Flora of North America” on [http://www. efloras.org] Web. 5 Aug. 2015.
4) Wikipedia contributors. "Dudleya gnoma." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 30 Jun. 2014. Web. 5 Aug. 2015.
5) CSJA, Vol. 76, No. 5, p.276, "The Dudleya Issue".
6) Debra Lee Baldwin “Succulent Container Gardens: Design Eye-Catching Displays with 350 Easy-Care Plants” Timber Press, 20 gen 2010
Cultivation and Propagation: Grow it as a house or conservatory plant in a porous mix, or as a garden perennial where winters are mild and summers dry. Dudleyas are hardy in USDA Zoned 9-12, the plant is highly heat and drought tolerant during the summer months and prefers moist cool winters. Powdery white leaves make these plants standouts, but avoid touching them as they are easily and permanently marked by finger marks. All of the plants in the Dudleya genus are known to live up to 100 years.
Soil: They do best in very well-drained, sandy or gravely soil. As an ornamental it is also grown in containers where it stays smaller than its outdoor brethren. In pots they need a very porous mix soil (e.g. 2 parts peat moss to 1 part loam to 1 part of pumice).
Exposure: It requires ample sun, but provide midday shade where summers are hot. The quality of light is much more important than the quantity, the plants contain farinose powder which makes them really effective for ultraviolet reflectivity. Low light situations might be stressful and create a susceptibility to mealy bug infestation.
Watering: Dudleyas are summer-dormant winter growers that require fresh air, exceptionally well- drained soil, and no summer water—even though they may appear drought stressed because their outer leaves dry and curl inward. (provide water in spring and autumn). In the summer the roots are unable to absorb the water so any excess of water simply rots them because of their dormant state.
Maintenance: Remove spent flower stems for appearance. The older leaves of Dudleyas wither but remain attached to the stem. Whether or not they should be removed is disputed, but they provide a hiding place for pests and some growers preference to remove them.
Uses: This can become a beautiful pot plant with pretty inflorescences with the right care.
Propagation: Dudleyas has been found to be propagated through both seed and vegetative, although vegetative propagation by offsets in spring or early summer is not only more popular but it is much easier to do. Dudleya should be planted at an angle. This prevent s the buildup of water in the leaves, which may lead to the leaves rotting. The vegetative propagation process needs to be done with temperatures reaching 21 degrees C. Let dry the cutting for about five to ten days and put the the cutting into the rooting compost (2 parts perlite and 1 part cactus potting mix). After finishing this you then place the pot in a warm, sheltered, but very bright filtered light area with no direct sunlight, you do not want the leaves to dehydrate. During the rooting period make sore to limit water, the rooting will take around 2 weeks, after roots transplant into the growing container. One thing to remember when rooting cuttings, overhead watering is not good for it, apply only to the soil line. The seeds do not need to be covered but do need a moistened soil for germination. Placing them into a mist house at an optimal 20-21 degrees Celsius with sufficient lighting resulting in germination. Germination occurs in just two weeks.
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