Strombocactus disciformis (DC.) Britton & Rose

국표에 없다.

Origin and Habitat: Mexico (Quetaro, Hidalgo and Guanajuato), extent of occurrence approximately 4,500 km2. It occurs in 19 known localities, and is experiencing a decline in mature individuals due to illegal overcollection.
Habitat: Strombocactus disciformisSN|2103]]SN|2103]] is reported in matorral on steep, limestone cliffs and slopes, mudrock (lutita) alluvial cliffs along stream beds or nearly vertical canyon walls. Illegal collection for the ornamental plant trade is an increasing threat. This cactus is found in the Mexican trade of ornamental plants.

Description: Strombocactus disciformisSN|2103]]SN|2103]] is a rare geophytes, usually solitary. Two subspecies are recognized, the nominate form and subsp. esperanzae Glass & S. Arias.
Stem: The body is flattened or spherical, 3 to 8 cm high, reaching 20 cm in age, and 3 to 9 cm across. The crown is slightly depressed and felted. The colour is blue-green with greyish tinge, the base covered with brown corky spots in age. It is composed of hard, spirally arranged rhomboid and imbricate tubercles, 1 to 1.8 cm high. These tubercules are flattened and almost truncated above and somewhat horny or keeled below.
Spines: 4 to 5, erect and dark grey at the tips and pale grey at the base, 1.2 to 2 cm long, they become calcified, they are caducous and in age fall at the stem base.
Roots: Strong napiform (turnip-like).
Flower: Arise on the crown, measure about 3.5 cm in length and breadth, are shiny cream coloured with occasional spots at the tip and in the throat, The filaments are white or reddish, the anthers yellow. The 8 to 10 lobed stigma are white or yellowish.
Fruit: 7 mm across, splits down its length.
Seeds: Very small.
Blossoming time: Flowers emerge early in spring and are freely produced throughout the summer, remaining open for several days.

Strombocactus disciformis (llifle.com)

https://youtu.be/7z05GdfsNRY?t=489

https://youtu.be/Ax46y1qz_ho?t=151

https://youtu.be/7z05GdfsNRY?t=897

https://youtu.be/-7rNP1UBOYo?t=21