Strombocactus disciformis f. polytomicous

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Since 4 Aug 2013

Strombocactus disciformis f. polytomicous hort.

Family: CACTACEAE

Strombocactus disciformis f. polytomicous Photo by: Valentino Vallicelli
(crests divided in several single apexes)

Origin and Habitat: Garden origin (Nursery produced cultivar)

Synonyms:

Strombocactus disciformis f. polytomicous hort.

See all synonyms of Strombocactus disciformis

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Accepted name in llifle Database:
Strombocactus disciformis f. polytomicous hort.

Accepted name in llifle Database:
Strombocactus disciformis (DC.) Britton & Rose
Cactaceae (Britton & Rose) 3: 106. 1922 [12 Oct 1922]
Synonymy: 14

Strombocactus disciformis (DC.) Britton & Rose

Anhalonium turbiniforme (Pfeiff.) F.A.C.Weber in Bois
Ariocarpus disciformis (DC.) W.T.Marshall
Cactus disciformis Kuntze
Cactus turbinatus Kuntze
Echinocactus disciformis (DC.) K.Schum. in Engl. & Prantl
Echinocactus turbiniformis Pfeiff.
Echinofossulocactus turbiniformis Lawr. in Loudon
Mammillaria disciformis DC.
Mammillaria turbinata Hook. in Curtis
Pediocactus disciformis (DC.) Halda
Strombocactus turbiniformis (Pfeiff.) Frič

Strombocactus disciformis var. seidelii (Frič) K.Crkal

Strombocactus turbiniformis var. seidelii Frič

Accepted name in llifle Database:
Strombocactus disciformis f. cristatus hort.

Accepted name in llifle Database:
Strombocactus disciformis subs. esperanzae Glass & S.Arias
Brit. Cact. Succ. J. 14(4): 202 (1996)
Synonymy: 5

Strombocactus disciformis subs. esperanzae Glass & S.Arias

Ariocarpus pulcherrimus (Halda) Halda
Pediocactus pulcherrimus (Halda) Halda
Strombocactus disciformis var. esperanzae (Glass & S.Arias) Don Pedro & Říha
Strombocactus pulcherrimus Halda

Accepted name in llifle Database:
Strombocactus disciformis subs. jarmilae (Halda) Halda
Acta Mus. Richnov., Sect. Nat. 4(2): 71 (1997)
Synonymy: 5

Strombocactus disciformis subs. jarmilae (Halda) Halda

Ariocarpus disciformis subs. jarmilae (Halda) Halda
Pediocactus jarmilae (Halda) Halda
Strombocactus disciformis f. minimus Don Pedro & Říha
Strombocactus jarmilae Halda

Cultivars (2):

Strombocactus disciformis f. caespitosus hort.

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Description: Dichotomous, trichotomous, quadritochomous… polytomichous. Polytomy is a form of cristation, an apex divided in 2, 3, 4 … or in a lot of smaller apexes. It is very unusual to see such a Strombocactus. Some of these plants are very nice sculptures one different from another. There are also plants that show the classical line cristation and polytomy at the same time.

Subspecies, varieties, forms and cultivars of plants belonging to the Strombocactus disciformis group

Strombocactus disciformis (DC.) Britton & Rose: the stem is flattened or spherical, blue-green with greyish tinge 3 to 8 cm high and 3 to 9 cm across. It is composed of hard, spirally arranged rhomboid tubercles that are flattened and almost truncated above.
Strombocactus disciformis f. cristatus hort.: Crested form.
Strombocactus disciformis subs. esperanzae Glass & S.Arias: (= S. pulcherrimus) is very similar to S. disciformis the only noticeable difference is the colour of the flowers that are bright magenta.
Strombocactus disciformis subs. jarmilae (Halda) Halda: like S. disciformis but with a smaller body, small flowers, long thin spines and some other minor differences. Distribution: Northern Mexico (Querétaro and Nuevo León)
Strombocactus disciformis f. polytomicous hort.: Polytomy is a form of cristation, an apex divided in a lot of smaller apexes. It is very unusual to see such a Strombocactus.
Strombocactus disciformis cv. Cactus Art: odd monstrous plant forming crowded clumps or mounds, and most plants will crest readily. Areoles felt-like in relief 2-4 mm broad, greenish at the stems apex when young. Spines mumerous very short bristle-like.
Strombocactus disciformis cv. Cespitosa: This is a strange plant that forms lots of axillary shoots in a continuous series on almost each node starting from the base of the stem, while the typical Strombocactus disciformis is usually solitary.

Strombocactus disciformis f. polytomicous Photo by: Valentino Vallicelli

Strombocactus disciformis f. polytomicous Photo by: Cactus Art

Strombocactus disciformis f. polytomicous Photo by: Cactus Art

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Cultivation and Propagation: It’s a relatively easy species to cultivate, but very slow growing. It needs a very well drained soil, and requires strong sun to part sun to develop good growth. Waterings should be rather infrequent to keep the plant compact, and not to become excessively elongated and unnatural in appearance. Keep dry in winter, or when night temperatures remain below 10° C (but some people give this plant a light monthly watering to prevent the drying and shedding of the lower tubercles.)
It is hardy to -4°C for a short period. Assure good ventilation.
Propagation: It can be reproduced by cuttings, but it is often grafted because difficult and slow to grow on its own roots.

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