Gymnocalycium megalothelon
Cactaceae (Britton & Rose) iii. 162. 1922 Note: as ''megalothelos'' (a.k.a. megalothele )
Family
Cactaceae
Genus
Species
Gymnocalycium megalothelon
Author
(Sencke ex K.Schum.) Britton & Rose
Chinese genus
裸萼球属
Chinese name
-
Accepted
DescriptionEdit description
Habit
It is a (usually) solitary geophytic cactus with five ribbed appearance.
Central Spines
Usually absent, or 1 erected one.
Flowers
Are some of the largest in this genus, often growing larger than the plant!, 6 up to 7 cm long and wide, pure white and double petaled. Self-fertile!
Ribs
5-7, rounded, grooved transversely. Tubercles few per ribs, more prominent and "chinned" than in standard Gymnocalycium denudatumSN|1724]]SN|7888]].
Stem
Flattened or globular, grey-green to olive green, 5-6 cm in diameter, up to 5 cm tall, but in cultivation it can become 7-8 cm high (or more) over the years.
Radial Spines
Stout 5-7 up to 12, but usually less in young plants, flattened against the body.
Fruits
Green.