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Astrophytum myriostigma "quadricostatum" (Four
ribbed form)
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Description:
A. myriostigma quadricostatum was first described
in 1841 by M. Mittler who wrote "The body of the plant is of elongated
round form and has four ribs".
This form deviates from the well-known typical form for
having four ribs instead of five.
Stem: Quadrangular to almost spherical, the plants become shortly
columnar with age. The stems are smooth and can be over 90 cm tall and
5-10 (-20) cm in diameter.
Spines: None.
Ribs: 4.
Flowers: Arise from the areole at the tip of the stem on mature
plant. up to 5 cm wide (or more), pale-yellow, shining-silk,
unlike the
5-ribbed plant.
Blooming season: Spring or late summer, They take up to 6 years
to bloom.
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Cultivation is not too difficult in a
greenhouse, although grows
quite slowly. The plants need a loose well-drained
mineral soil. They need a good amount of
light.
Watering can be done weekly during
summertime, if the weather is
sunny enough, with a little
fertilizer added. Kept this way, plants will
show a
healthy, although slow
growth. They are
frost hardy to -4°
(-10°) C.
Propagation: Almost exclusively by seed. Plants are sometimes
grafted onto column-shaped cacti.
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A. myriostigma
var.strongylogonum "quadricostatum"
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A. myriostigma
nudum "quadricostatum" |
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Etymology: "quadricostatum" just means it has 4
ribs. There are some other varieties of the 4 ribs, such as "nudum
quadricostatum", "variegated quadrocostatum",
"Onzuka
quadricostatum", strongylogonum quadricostatum"
etc.
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(Left) Standard A. myriostigma quadricostatum
and (right)
cv. ONZUKA
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Family:
Cactaceae (Cactus
Family)
Accepted
scientific name:
Astrophytum myriostigma Lemaire
Original description: Cactacearum Genera nova Speciesque novae et
omnium in Horto Monvillano cultarum: 4-6 1839
"quadricostatum"
Origin:
Garden origin. Four
ribbed plants of Astrophytum myriostigma are occasionally found in
a natural habitat, but the clones actually in
cultivation are of
garden origin (Nursery produced cultivars).
Conservation status: Listed in
CITES appendix 2.
Synonyms:
- Echinocactus myriostigma subsp. quadricostatus,
MÖLLER, H.
In: Zeitschrift f. Sukkulentenkunde
- (Astrophytum myriostigma v. quadricostatum) Echinocactus (Astr.)
myriostigma LEM. v. quadricostatus MOELL., BAUM,
H.
In: Kakteenkunde (recombination)
- Astrophytum myriostigma v. quadricostatum
In: The Cactaceae - Classification and Illustration
of Cacti by Yoshio Ito
- Astrophytum myriostigma v. quadricostatum pubesente,
ITO, Y., Japan (first description)
A. myriostigma quadricostatum (ball form)
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Photo of conspecific
taxa, varieties, forms and cultivars of Astrophytum myriostigma:
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Cultivation and Mail Sale 
