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Origin and Habitat: Endemic to the southern part of Sierra de San Luis (Argentina, Province of San Luis) within a radius of only 20 km..
Altitude: 1400 to 1700 m over sea level.
Habitat: This species grows on a high plain on undulating outcrops of gneiss and quartz, the ground is bare or scattered with short grasses. Individuals exposed to the weather in open plains are more densely spined.
Gymnocalycium andreae subs. carolinense Neuhuber
Gymnocalycium 7(3): 129 1994
Gymnocalycium andreae (Boed.) Backeb. & F.M.Knuth
Kaktus-ABC [Backeb. & Knuth] 285. 1936 [12 Feb 1936]
Gymnocalycium andreae var. fechseri H.Till
Gymnocalycium 13(4): 378 (377; abb. 1-2). 2000 [October 2000]
- Gymnocalycium andreae var. fechseri H.Till
- Gymnocalycium andreae var. doppianum H.Till & R.Kiesling
- Gymnocalycium doppianum Mereg.
Gymnocalycium andreae var. grandiflorum Krainz & Andreae
Kakteen (H. Krainz) 4: C VIe. 1957
Accepted name in llifle Database:
Gymnocalycium andreae var. longispinum Rausch
Gymnocalycium 13(4): 378 (abb. 3-4). 2000 [October 2000]
Accepted name in llifle Database:
Gymnocalycium andreae subs. pabloi Neuhuber
Gymnocalycium 24(2): 985. 2011 [May 2011]
Description: Stem: Small spherical-flattened up to 12 mm tall and 20 mm in diameter (but up to 3,4 cm tall and 6 cm in diameter in cultivation), apex depressed, epidermis dull blue-green
Ribs: 9-12 flat, in vertical rows, divided in flat bumps slightly enlarged with a shallow groove around the areola.
Areoles: Oval 3 x 5 mm in wide 1 to 10 mm apart, with yellowish-white wool, later whitish.
Root: Swollen, long and branched.
Radial spines: 7 to 9 rounded (or occasionally flattened) in cross section, 10-15 (or more) mm long, one of them sometimes shorter, more or less curved against the body (sometime almost forming hooks), often pointing on the sides or downward, light brown with creamy-brown tips, sometime in older plants areoles bears two small spines pointing upward.
Central spines: 1 to 2 often absent in nature, but frequent in cultivation, one up and one down 10-15 mm long.
Flower: Near the upper part of the areoles, shortly funnel-shaped, 24-35 mm long, 30-45 mm in diameter, white, sometimes pink, sweet smelling. Pericarpel short, conical, 4-6 mm long, 7-9 mm in diameter, dark green, silky satin, with a small number of rounded, whitish to pale pink fringed scales. Outer petals up to 19 mm long and 5-8 mm wide, white to pink with a broad, medium green stripe. Inner petals lanceolate, 15-16 mm long, 2-4 mm wide, yellowish-white to pale-pink with a darker central stripe. Stamens relatively few clustered around the stigma; filaments white, thin, straight, 7-8 mm long, anthers pale-yellow, oval, 0.7 x 0.4 mm. Pistil white, 10 to 13 mm long, 1 mm in diameter, creamy white, stigma, 5-6 mm long, with 7 to 8 lobes usually exceeding the uppermost anthers.
Fruit Pear-shaped, 13-16 mm high, 6-13 mm in diameter, dark green to olive green at maturity, dehiscing in 1 to 2 places lengthwise.
Seeds: About 1,3 mm long and 1,1 mm in diameter, dull, black, often covered with light brown cuticle.
Subspecies, varieties, forms and cultivars of plants belonging to the Gymnocalycium andreae group
Cultivation and Propagation: It is a low growing species, but it possible to increase the speed of growth to some extent by providing adequate amount of water, warmth, and fertilizer during the active growing season, but it’s susceptible to rotting if too wet and do not like a lot of water when in resting phase. It like pots with generous drain holes, need a very porous, slightly acidic potting medium (add pumice, vulcanite, and perlite). This plant is suited for full sun to light shade exposures, but avoid direct blasting sun in summer. The spination of this plant is much more marked if grown in full sun. It can be grown outdoors in frost-free climates, need anyway to kept above 0°C and dry in winter. (but reported to be hardy down to – 18° C (or even less) for short periods.
Manteinance: Repot every two years.
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