Synonyms:

The name “Notocactus uebelmannianus var. flaviflorus” is actually a synonym of “Parodia crassigibba”, although, in cultivation, plants are labelled with both names. Other synonyms are:

Notocactus arachnitis
Notocactus arachnitis f. darilhoensis
Notocactus arachnitis f. minor
Notocactus arachnitis var. minor
Notocactus crassigibbus
Notocactus meonacanthus
Notocactus uebelmannianus
Notocactus uebelmannianus f. gilviflorus
Notocactus uebelmannianus f. nilsonii
Notocactus uebelmannianus subsp. pleiocephalus
Notocactus uebelmannianus var. nilsonii
Notocactus uebelmannianus var. pleiocephalus
Parodia meonacantha
Parodia werneri
Parodia werneri subsp. pleiocephala
Ritterocactus crassigibbus
Ritterocactus meonacanthus
Ritterocactus uebelmannianus
Ritterocactus uebelmannianus subsp. pleiocephalus

Habitat:

Notocactus uebelmannianus is native to southern Brazil, where it grows in rocky, flat soils. In its natural habitat, it is endangered by grazing and farming activities. The flaviflorus variety (which has yellow flowers) is more common in the wild, while, in cultivation, the red-flowers form is more appreciated.

Description:

Notocactus uebemannianus var. flaviflorus is primarily a solitary plant, typically found growing individually rather than in groups. The distinctive shoots of this plant are spherical in shape, with a depressed appearance. They exhibit a range of diameters, typically spanning from 4 to 17 centimeters. Notably, the shoot apex lacks thorns or spines, providing a smooth and unthorned appearance. The surface of the shoots is adorned with approximately ten to fifteen low and rounded ribs, which give the plant a unique texture. These ribs are further adorned with broad, chin-like humps that add to its distinctive visual appeal. The areoles, located between these humps, take on a white coloration, creating a striking contrast against the plant’s green body. Regarding the spines, the majority of them have a somewhat curved shape and lie close to the surface of the shoots. These spines exhibit a color range spanning from white to gray or light brown, providing additional visual interest. Their lengths vary from 0.5 to 3 centimeters. Notably, the spines are divided into up to one central spine and six to fourteen marginal spines, contributing to the overall unique appearance of the plant. Moving on to the flowers, they possess dimensions ranging from 4.5 to 6 centimeters in both length and diameter. The flower color displays a remarkable variability, offering a range from white to yellow or reddish purple. The pericarp, which envelops the flower, is characterized by a dense covering of wooly fibers, while only a few bristles are present. The stigma, a crucial part of the female reproductive structure, takes on a captivating dark purple coloration. The plant produces barrel-shaped green fruits that exhibit a swollen appearance. These fruits are covered with white wool and adorned with yellow bristles, adding an appealing texture to their surface. They can reach a length of up to 1.5 centimeters. Within these fruits, one can find hemispherical seeds with a cloudy-black coloration. Notably, the protruding hilum of the seeds displays a corky texture, further enhancing the visual and tactile interest of the plant.

Cultivation:

Cultivating Notocactus uebelmannianus var. flaviflorus offers a rewarding experience, as this plant displays a slow but steady growth rate while being remarkably easy to care for. To create an optimal environment for its growth, it is advisable to position the plant in a bright location. However, it is wise to shield it from direct sunlight during the hottest periods, ensuring it receives the perfect balance of light and shade.

When it comes to temperature tolerance, Notocactus uebelmannianus var. flaviflorus can withstand a minimum temperature of 7°C. Any temperature below this threshold can cause the plant to suffer, making it necessary to provide indoor shelter during the coldest periods. By doing so, we ensure that our precious plant remains in a cozy and comfortable habitat. In terms of soil requirements, a well-drained substrate that facilitates water drainage and prevents the dreaded root rot is essential. To achieve this ideal soil condition, consider mixing in pumice and clay, which enhance drainage properties. Opting for a perforated pot further aids in eliminating excess water and maintaining a healthy root system. Watering practices should be adjusted according to the growing season. During the active growth period, a watering interval of approximately every 7 days is recommended. However, it is crucial to verify that the soil has completely dried out before providing moisture again. As winter arrives, it is crucial to halt watering to allow the plant to enter its dormant phase, conserving energy and preparing for the upcoming growth cycle. Moderate fertilization during the growing season proves beneficial for Notocactus uebelmannianus var. flaviflorus. Utilize specific fertilizers formulated for succulents, carefully following the instructions for application. However, remember to suspend fertilization during the winter months, respecting the plant’s natural resting period. Repotting, a necessary task for maintaining the plant’s vitality, should be undertaken every 2 years using a pot that is 2 cm wider than the previous one. Ideally, this process should be performed early in the growing season, ensuring the availability of fresh potting soil to support the plant’s growth and development. It is crucial to remain vigilant against potential pests. Be on the lookout for red spiders and mealybugs, promptly addressing any infestations to safeguard the plant’s well-being and beauty. With attentive care and diligent pest control, your Notocactus uebelmannianus var. flaviflorus will thrive, rewarding you with its captivating presence.

Propagation:

Notocactus uebelmannianus var. flaviflorus can be propagated either by seed or by cuttings. Seed propagation is a relatively simple method. All you need to do is place the seeds in sandy loam soil, ensuring it has a high moisture content. The ideal germination temperatures range from 20 to 28 °C. Alternatively, you can opt for propagation through cuttings. During the spring season, carefully cut an offset from the plant. Allow a few days for the cut surface to dry and form a callus. Then, prepare a mixture of sand, soil, and pumice, and place the cutting in it. For better success in propagation, you can cut two or more offsets simultaneously. It is recommended to maintain temperatures around 20 °C for the cuttings.

Curiosity:

The genus name “Notocactus” originates from the combination of two Greek words. “Noto” is derived from “notos,” meaning “south” or “southern,” while “cactus” refers to the overall group of cacti plants. This combination suggests that the genus has a connection to cacti found in southern regions. The specific epithet “uebelmannianus” is a Latinized form of the surname “Uebelmann.” It honors the Swiss botanist and cactus enthusiast Heinrich Uebelmann. Uebelmann made significant contributions to the study and cultivation of cacti and succulent plants, particularly in the mid-20th century. The variery “flaviflorus” refers to the yellow colour of its flowers.

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