Thelocactus hexaedrophorus (Lem.) Britton & Rose

국표에 없다.

Origin and Habitat: San Luis Potosi, Zacatecas, Tamaulipas, and Nuevo Leon, Mexico.
Altitude: Subspecies hexaedrophorus grows a lover altitude from 1100 to 2000 metres above sea level. (Subspecies lloydii 2200-2300).
Habitat: It grows in large numbers on gentle limestone hill slopes, plains and terraces in the Chihuahuan Desert, savanna, and grasslands, often in association with other plant species, including Mammillaria parkinsoniiSN|2309]]SN|20725]], Mammillaria aureilanataSN|20725]]SN|2309]], Ariocarpus retususSN|2079]]SN|2079]], Gymnocactus knuthianusSN|12746]]SN|12746]], Coryphantha maiz-tablasensisSN|3914]]SN|10267]], Astrophytum myriostigmaSN|1845]]SN|1845]], Echinocactus platyacanthusSN|10367]]SN|10367]] and Echinocereus blanckiiSN|7775]]SN|7478]], Coryphantha radiansSN|10267]]SN|3914]], Ferocactus latispinusSN|4259]]SN|4259]], Echinocereus pectinatusSN|8503]]SN|8503]], Echinocereus cinerascensSN|7478]]SN|7775]], Opuntia rastreraSN|8157]]SN|19989]], Opuntia lindheimeriSN|19931]]SN|19931]], Opuntia imbricataSN|19989]]SN|8157]], Myrtillocactus geometrizansSN|8050]]SN|8050]], Heliabravoa chendeSN|7732]]SN|7732]], Agave salmianaSN|27883]]SN|27883]], Yucca filifera, Jatropha spathulata and Fritillaria lanceolata.

Description: Thelocactus hexaedrophorusSN|10830]]SN|10830]] is a solitary and quite variable cactus with flattened stems. Many local forms are known, often formally described, that differ in stem, spine or flower morphology. Because of the large variability of the species in the whole distribution area, none of these are recognised today.
Stem:Globose or somewhat flattened above or umbilicate, glaucous, olive-green, or greyish-green eventually tinged in pink or purple, 3-7,5 cm tall , 8-15(-20) in diameter (eventually grows a little taller in cultivation), strongly tubercled and not ribbed.
Ribs: 8-13 indistinct, but generally evident in adult plants.
Tubercles: Fat, prominent, polygonal-rounded (hexagonal or pentagonal based), arranged in indefinite spirals, not flattened laterally, sometime compressed at the tip, 8-20 mm long, 13-27 mm large.
Areoles: 4-13 mm long, 12-28 mm apart, on top of the tubercles, elongated into a short groove, without nectar secreting glands.
Spines: Usually strong and variable in length depending on the clone often difficult to distinguish as centrals and radials.
Radial spines: 4-6 (6-8 on subsp. lloydii), erect to spreading, unequal, (5-)11-18(-60) mm long, pure white, ochre, reddish to brown, rigid, straight or curved, acicular to subulate and annulate.
Central spines: Almost always absent or sometime 1(-3), erect, much stouter than the radials, 15-18(-30) mm long, ochre, pinkish-grey, reddish, purplish, brow to whitish acicular to subulate.
Flowers: Silvery-white or rarely pinkish with more or less magenta midribs, 4,5-5,5(-10) in diameter, broader than long when expanded . Tube very short. Pericarpel covered with scales. Perianth-segments oblong, purplish; stigma-lobes yellowish white.
Fruit: Spherical, with scales, green magenta, 7-12 mm becoming dry at maturity dehiscing by basal pores.
Seeds: 1,5-2 mm long and 1,2-1,5 broad, with testa reticulate, divided into polygonal or square areas.

 

 

 

 

Thelocactus hexaedrophorus (llifle.com)

https://youtu.be/-cxR2XF6fZQ?t=212