Notocactus scopa (Locality: Laguna Garzon)
It has very pretty, soft, silvery-white, fir-like spines, often
with red centrals. The exciting lemon-yellow flowers with pale anthers
and scarlet stigma open during the day and close at night.
Habit: Silvery green cactus often clustering
with showy yellow flowers. The stems are
almost hidden by soft
tufts of bristly spines somewhat similar to small brushes. The
mixture of white and red-brown spines, varying from plant to plant.
Stem: Dark green,
first globular, becoming bit columnar
to clavate with age, depressed apically, up to 45 cm
tall, 6-10 cm in diameter.
Ribs: 25-30 (sometime up to 40 or more) low, obtuse, finely
notched into low warts tipped with areoles, which may spiral slightly.
Areoles: White woolly.
Central spines: About 4 (but
varying from 2 to 12) medium length (6-12 mm long), needle-like, stouter
orangish or white.
fine, bristles-like, glassy white or yellowish, 5-7 mm long, spreading
Flower: A cluster of satiny,
bright yellow flowers spring in the upper part of the stem forming a
ring, The are 2-4 cm long and 3,5-4,5 cm in diameter. Inner
perianth segments in two overlapping series, spatulate, rather wide for
their length, ± toothed above, Pistil with about 10, rayed, bright
crimson stigma lobes. Tube short. Scales on the ovary woolly with brown
Blooming: seson: June-July.
Fruit: Globose, about 7 mm in diameter, opening at maturity, with
Seeds: Dull black tuberculate.
Ribs 30-40, central spines 4, radial spines glassy white more than
40. Origin: Southern Brazil and Paraguay.
ssp. marchesii: Ribs 19-28, central spines 2-4, radial spines
about 40. Origin: Uruguay.
Ssp. neobuenekeri: Ribs: 18-21, central spines 6-12 stout. Origin: Rio
Grande do Sul. Brazil.
ssp. succinea: Ribs 18-24, central spine 8-12, Radial spines
15-30 often yellowhish. Origin: Rio Grande do Sul. Brazil.
and © copyright by
B. (Bologna, Italy)
It has very pretty, soft,
white, fir-like spines, often with red centrals. The satiny and
canary-yellow flowers are born on
apical clusters and form rings, they open during the day and
close at night.
Notocactus scopa (Sprengel) Backeberg
in: Backeb. & F. M. Knuth, Kaktus-ABC,
(Notocactus scopa (Spreng.)
in: A.Berger -- Kakteen, 208, 343
Vegetabilium, 2:494, Göttingen 1825
Southern Brazil (Rio Grande do Sul),
Uruguay, Paraguay, northern Argentina.
Native to the grasslands
scopa aggregate is an ensemble of related species comprising
N. schlosseri, N. scopa var. xicoi, N. sucineus
plant has been Transferred to Parodia in
1997 by David Hunt.
genus name "Notocactus"
derives from the Greek words “notos” meaning “south”
indicating that the plants of this genus are from of the South (America)
and the word “cactus” ( an old genus name)
(The genus name implies:
“cactus of the south”).
derives from the Latin word “scopa (
pl. scopæ )
” meaning “a broom”, referring to the long
and dense spination.
(The specific name implies:
Common English Names include:
Silver Ball Cactus,
- Parodia scopa (Sprengel)
N.P. Taylor 1987
- Cereus scopa Salm-Dick
In De Candolle, Prodr. 3464.
- Echinocactus scopa Link
In: Icon Pl. Rar. 81. 1830
- Echinocactus scopa candidus
In: Enum. Cact. 64. 1837
- Echinopsis scopa
In: Rev. Hort. 47:374. 1875
- Echinocactus scopa albicans
In: Anal. Mus. Nac. Montevideo
- Malacocarpus scopa (Sprengel)
Britton & Rose 1922
- Notocactus scopa (Sprengel)
A. Berger 1929
- Notocactus scopa (Link &
in: Kakteen (Berger) 343. 1929
- Notocactus soldtianus
- Peronocactus scopa
Red central spines and shorter white around.
Yellow bloom with contrasting red pistil.
is easy to grow. It
prefers a neutral to slightly acidic
mineral-based potting mix with a good
It likes a warm bright location, does great in partial shade but doesn't like
full, hot blazing sun in the central summer month.
Can support quite some water during the growing season
but pot plants in winter are
needs to be kept
dry (rots easily if soil is wet and cold) tends to lose
its roots in winter.
Usually it is recommended to
this plant in a bright and warm greenhouse with at least 8-10° C ,
but it has proved to tolerate temperatures as low as -5° C for short
cuttings or root suckers (if available). Not too difficult to raise from seed.
Photo of conspecific taxa, varieties, forms and
cultivars of plants belonging to the