Gymnocalycium spegazzinii .
It is considered by many the most
beautiful and charming species
in the whole large genus Gymnocalycium.
Stem: Noticeably flatten brownish-grey to amost black up to 18 cm
(or more) in diameter, 10 cm tall in cultivation (in nature it is
partially underground). Apex depressed an wolly. Will not
Ribs: 10-33 evenly subdivided in confluent tubercle, not chinned.
Transversal grooves rudimentary or absent.
Elongate 8-10 x 4-6 mm yellowish o greyish.
Central spine: Absent.
Radial spines: 5-7(-9) strong, flattened 25-55 mm long, typically
add-pressed against the body and most attractive, the
young spines are yellowish or blackish and become brownish-grey as they
Flowers: Infundibuliform on the plant apex 70 mm long, 50 mm in
diameter. Outer tepals spatulated whitish or pinkish with a glaucous
green midrib. Inner tepals smaller, lanceolated white with a pink midrib
and basally crimson coloured. Filament crimson, anthers pale-yellow,
style white to pink, stigma with 10-16 white lobes.
Flowers are produced in late spring and remain open for up to twelve
Fruit: Elonged up to 35 mm long, green covered with bluish pruine.
Seed: Of the microsemineum type +/- 0.9mm.