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  Gymnocalycium marquezii forma variegata
(Gymnocalycium pflanzii)
CACTUSPEDIA       

 


Gymnocalycium marquezii variegata (G. pflanzi)
This beauty has a green body variegated in yellow-cream and pink, it has also
fairly heavy spines bent backward in a distinctive fashion.
 

Description: Solitary or slowly clustering, with peculiar spine clusters characteristically bent backward in a distinctive fashion.
Stem: Flattened-globose,10-15 (25)cm in diameter, 10cm tall pale green, to olive green that can tinge of orangish purple in full sun. The epidermis has a velvety appearance. The apex is slightly depressed and woolly.
Ribs: 10 to 12 thick, large, divided into polygonal rounded (not chinned) tubercles, separated by arched furrows.
Roots: Fibrous
Areoles: Large long, oval 10x14 mm, with cream-yellowish wool, then blackish dismantling with time.
Spines: Strong, very stiff, bent backward, initially blackish with a brown base then becoming grey-pinkish to whitish brown with black point.
Radial spines:  (5-)7-9 up to 25 mm long
Central spines: One (or two)  of the same length.
Flowers:
Infundibuliform near the apex, diameter and height 45-50mm. Pericarpell dull green very short. External tepals spatulate, slightly bent outward , white with brownish green midrib. Inner tepals intern narrower, spatulate and slightly denticulate, white with carmine/pink purplish throat. Style carmine with carmine pink 10-12 lobes. Pollen yellow.
Fruit: Globose of approximately 2 cm of diameter, becoming red carmine with maturity. Pulp intense cherry-red.
Seeds: Microsemineum type, section pirisemineum, very small (0.6 X 0.4mm), testa reddish shining and smooth.
Remarks:
  G. marquezii is very
similar in structure to G. pfanzii var. riograndense but has shark mat type skin, dark coppery red stem and dark spines
 



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Photo gallery Gymnocalicium

Family: Cactaceae (Cactus Family)

Scientific name: Gymnocalycium marquezii Cárdenas
in: Die Gattung Gymnocalycium in Bolivien.- Kakt. Sukk. 9(2): 26-27, ills. 1958 forma variegata

Type: Cárdenas 5066 – Bolivia: Tarija, Entre Rios, “near Angosto de Villa Montes” [protologue, translated] / “Angosto de Villa Montes, 600 m” [holotype], 600 m, 3.1952 (type herbaria: LIL). LIL 531592 (holotype): rad, corp, ar, sp, fl, ic.

Nowadays regarded as: Gymnocalycium pflanzii (Vaupel) Werdermann 1935

Origin Garden origin (Nursery produced cultivar)

Etymology: Named in the honour of
Dr. J. L. Marquez

Conservation status: Listed in CITES appendix 2.

Synonyms:

  • Gymnocalycium marquezii Cárdenas1958
  • Gymnocalycium pflanzii var. marquezii
  • Gymnocalycium marquezii var. argentinense Backeberg
    nom. inval. (Art.8.2) In: Kakteenlexikon: 169, Abb. Seite 566 (1966).
 


Cultivation: Gymnocalycium are very gratifying plants, their culture is easy and their flowering is abundant if we give them a well drained relatively rich substrate (if possible not limestone)  Water regularly in summer (but do not overwater ) keep rather dry in winter, need frequent repottings and a very luminous exposure but avoid direct exposure to the sun rays. This species is particularly easy and accommodating, seldom suffer of cryptogamic diseases. Feed with a high potassium fertilizer  in summer.   Hardy as low as   -5° C (or less) if  kept dry. Special cares for variegated forms: In the summer it is best to avoid direct sun during the hottest hours of the day (but they benefits from morning sun, that helps to produce strong and colourful spines).  In case of cultivation in a sunny place it is best to plant with the variegated spot facing northeast, so it gets the least amount of direct sunlight as possible.
Propagation:
Usually by Seeds (Seeds should be sown in a well-drained soil mix. Surface sowing is the best; seeds germinate in 14-28 days at 25° C, or  from cuttings in spring (let them dry till the ends callous well). Then replant them in fresh cactus soil that is ever so slightly moist, and keep it that way till they root). The grafting is useless (excluded the cultivars completely deprived of chlorophyll), it does not bring anything concrete

Notes: A variegated plant has sectors, patches or stripes with two or more different colours, even distinct shades of green. Plants with variegated stems or leaves are often attractive and highly prized.  In most species the stems or leaves are normally green, and variegated epidermis is an uncommon mutation, termed a chimera.  A chimeral variegation is due to losing the ability to produce chlorophyll in some of the plant’s tissue, so that this tissue is no longer green. Tissues lacking chlorophyll are usually white or pale yellow coloured (due to carotenoid pigments) or red (due to betalain or anthocyanin pigments) contrasting with the normal green tissue. There are several forms of variegation, depending on the tissues that have been affected. The variegation in some forms is unstable. The extent and nature of the variegation can vary, and sometimes the plant will return to the green form. In others it is stable and does not change under normal conditions. Because the variegation is due to the presence of two kinds of plant tissue, propagating the plant must be by a vegetative method of propagation that preserves both types of tissue in relation to each other. Variegated Gymnocalyciums  are very rare and priced in cultivation. All variegates are mutants. Something has gone wrong with the cellular structure of the growth tip (apical meristem) of the plant. As a result of this mutation, chlorophyll is missing from some or all layers of the plant epidermis. The odd variegate appears in many seedling batches in a small percentage, and is generally separated from normal plants. Variegated plants grow more slowly, and are generally smaller than non-variegates of the same species. Coloured areas are also generally weaker, and more susceptible to fungus, sunburn and other defects. A large well grown variegate Gymnocalycium is truly an achievement. These are harder to grow well than they appear.

Photo of conspecific taxa, varieties, forms and cultivars of Gymnoclycium pflanzii:



 

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The Encyclopedia of Cacti