Sulcorebutia tiraquensis (v. bicolorispina f. comachoi) KK1801
Epizana to Siberia, Bolivia Altitude: 3000m
S. tiraquensis is a clustering species
solitary) readily forming, especially in cultivation,
clumps of many
The stems are almost completely
concealed by fine variously coloured spines.
Stem: Soft globular, flattened and somehow apically
depressed, greysh-green to
dark green sometime very
forming oblong rhomboid tubercles with well-defined grooves.
with short grey felt
(almost naked) 3 – 6 long, 1,5-2 mm large.
Roots: Mostly non-succulent, fibrous roots. More than 90% of
the plant is concentrated in the stem.
Radial spines: 12-13 dense, erect, thin, bristle-like
and flexible, white, yellowish, brownish, reddish
or mahogany red with darker tips The spines
are often absent in new areoles and slow to develop.
Central spines: 1-3 often
absent, stouter becoming whitish with age.
monoflorous areoles, in
lower lateral flower zone.
Rarely more than 3,5 cm long
and 4,5 in diameter. Bright pink to
light purple, numerous in a ring at the base
of the plant.
Blooming season: April - May and remain open
for up to five days.
Small papery olive
green to reddish brown at maturity.
This species loves a very
mineral soil as well as to be strictly
kept dry throughout the
winter quiescent period since it is very
sensitive to any
moisture excesses, To prevent
rottenness it is also advisable to surround its
root neck by very rough
grit, this help a fast water
drainage and an appropriate
air circulation. Plants are quite
frost hardy -5 (-10)° C
moderately in the
growing season, keep
dry during the
Overwinter in a cool place (at 0/10°C) this is important for the
flowers as well as for plants
health. Without this cool winter period they normally wont get any
Needs a full
sun exposure ( light shadow my be useful in the hottest summer days)
Sulcorebutia steinbachii (Werderman)
Distribution: North and east
of Cochabamba in the Cordillera de Cochabamba, in southern
Sulcorebutia is the type species of the genus Sulcorebutia.
The first plants were collected near Colomi, along the route from
Cochabamba to Chapare, by a Herr Steinbach.
Habitat: Grows mainly on a flat,
dry, stony area along the banks of the Rio Lopez, just before the
moister zone of the tiraquensis populations.
Conservation status: Listed in
CITES Appendix II.
Etymology: Named for its occurrence near Tiraque, Prov.
Carrasco, Dept. Chochabamba, Bolivia.
- Rebutia tiraquensis Cárdenas 1957
- Sulcorebutia tiraquensis
(Cárdenas) F. Ritter 1961
- Weingartia tiraquensis (Cárdenas)
- Rebutia steinbachii ssp. tiraquensis
(Cárdenas) Gertel 1996 Not validly published
- Rebutia steinbachii ssp. tiraquensis
(Cárdenas) D.R.Hunt 1997
- Rebutia steinbachii Werderman
- Sulcorebutia steinbachii (Werderman) Backeberg 1951
- Weingartia steinbachii (Werderman) F.H.Brandt 1977
NOTE: Sulcorebutia steinbachii is one of the most variable
cactus species. The colour of the flower, the spines length, the body
shape and pigmentation is extremely variable, even within a population.
There are also many localized phenotypes capable of maintaining their
separate identity, even though only a few kilometers apart and by former
authors considered as separated species and varieties. They are nowadays
considered just phenotypes of a highly polymorphic specie. These
subpopulations are not only morphologically based but also
geographically and can be grouped as follow:
1a: Cochabamba to Chapare, northward and
eastward to Tiraque
S. polymorphaS. kruegeri
S. hoffmannianaS. glanduliflora Card. n.n.
S. steinbachii & vars. australis, gracilior, etc.A
1b: Province Tiraque to Epizana an
eastward to Comarapa, 2,800 m-3.000 m.
Sulcorebutia tiraquensis &
- S. spinosior & aglaia (bicolorispina)
- S. lepida
- S. krahnii
2: Cerro Tunari-south and east of
Cochabamba-Izata to Anzaldo, 3,400-3,900 m
S. taratensis & var. minima
S. pojoniensis Rausch n.n.A
3: West of Cochabamba-Ayopaya, 2,000-2,500
S. menesesii & vars. kamiensis
Around Totora and southward toward Epizana, 2,600-3,000 m
- S. totorensis
5: A limited area around Pasopaya and eastwards, 2,000 m
conspecific taxa, varieties, forms and cultivars of
plants belonging to the Sulcorebutia
Taxon has lots of synonyms whit
several controversial varieties and subspecies and comprises a multitude
of different forms, but where each form is linked to others by
populations of plants with intermediate characteristics):