Origin and Habitat: Mairana, Bolivia
Altitude: 1300(-1500) metres above sea level.

• Weingartia hajekyana

• Rebutia neocumingii (Backeb.) D.R.Hunt
• Bridgesia cumingii (Hopffer) Backeb.
• Echinocactus cumingii Hopffer
• Echinocactus cumingii Regel & E.Klein bis
• Gymnantha cumingii (Hopffer) Y.Itô
• Gymnocalycium cumingii (Britton & Rose) Hutchison
• Gymnorebutia neocumingii (Backeb.) Doweld
• Hildmannia cumingii (Hopffer) Kreuz. & Buining
• Lobivia cumingii (Hopffer) Britton & Rose
• Spegazzinia cumingii (Hopffer) Backeb. in Backeb. & F.M.Knuth
• Weingartia cumingii (Hopffer) Backeb. & Oosten
• Weingartia neocumingii Backeb.
• Rebutia corroana Cárdenas
• Gymnocalycium pulquinense var. corroanum (Cárdenas) Hutchison
• Gymnorebutia pulquinensis subs. corroana (Cárdenas) Doweld
• Sulcorebutia corroana (Cárdenas) Bredero & Donald
• Sulcorebutia neocorroana F.H.Brandt
• Weingartia corroana (Cárdenas) Cárdenas
• Weingartia pulquinensis var. corroana Cárdenas
• Rebutia neocumingii subs. lanata (F.Ritter) D.R.Hunt
• Sulcorebutia lanata (F.Ritter) F.H.Brandt
• Weingartia lanata F.Ritter
• Rebutia neocumingii subs. pulquinensis (Cárdenas) D.R.Hunt
• Gymnocalycium pulquinense (Cárdenas) Hutchison
• Sulcorebutia pulquinensis (Cárdenas) F.H.Brandt
• Weingartia pulquinensis Cárdenas
• Weingartia attenuata F.H.Brandt
• Weingartia brachygraphisa F.H.Brandt
• Weingartia neocumingii var. brevispina Backeb.
• Weingartia buiningiana F.Ritter
• Gymnorebutia buiningiana (F.Ritter) Doweld
• Weingartia columnaris F.H.Brandt
• Weingartia erinacea F.Ritter
• Sulcorebutia erinacea (F.Ritter) F.H.Brandt
• Weingartia erinacea var. catarirensis F.Ritter
• Weingartia gracilispina F.Ritter
• Weingartia hajekyana
• Weingartia hediniana Backeb.
• Gymnorebutia hediniana (Backeb.) Doweld
• Sulcorebutia hediniana (Backeb.) F.H.Brandt
• Weingartia neocumingii var. hediniana (Backeb.) Donald
• Weingartia knizei F.H.Brandt
• Weingartia knizei var. bruneispina Kníže
• Weingartia longigibba F.Ritter
• Sulcorebutia longigibba (F.Ritter) F.H.Brandt
• Weingartia lanata subs. longigibba (F.Ritter) Donald
• Weingartia neocumingii var. longigibba (F.Ritter) K.Augustin & Hentzschel
• Weingartia mairanana (Donald) F.H.Brandt
• Gymnorebutia pulquinensis subs. mairanensis (Donald) Doweld
• Weingartia neocumingii var. mairanana (Donald) A.B.Lau
• Weingartia neocumingii var. mairanensis Donald
• Weingartia pulquinensis var. mairanensis (Donald) Pilbeam
• Weingartia mataralensis F.H.Brandt
• Weingartia matoralensis Kníže
• Weingartia multispina F.Ritter
• Gymnorebutia neocumingii subs. multispina (F.Ritter) Doweld
• Sulcorebutia multispina (F.Ritter) F.H.Brandt
• Weingartia neocumingii var. multispina (F.Ritter) Donald
• Weingartia neglecta F.H.Brandt
• Weingartia neocumingii var. koehresii Oeser
• Weingartia neocumingii var. neglecta F.H.Brandt
• Weingartia neocumingii f. prolifera hort.
• Weingartia pruinosa hort.
• Weingartia saetosa F.H.Brandt
• Weingartia sp. KA381 Icla, altitude 2630m
• Weingartia sucrensis F.Ritter
• Sulcorebutia sucrensis (F.Ritter) F.H.Brandt

• Rebutia neocumingii subs. pilcomayensis (Cárdenas) D.R.Hunt
• Sulcorebutia pilcomayensis (Cárdenas) F.H.Brandt
• Weingartia lanata subs. pilcomayensis (Cárdenas) Donald
• Weingartia pilcomayensis Cárdenas
• Weingartia platygona Cárdenas
• Sulcorebutia platygona (Cárdenas) F.H.Brandt
• Weingartia lanata f. platygona (Cárdenas) Donald

• Rebutia neocumingii subs. riograndensis (F.Ritter) D.R.Hunt
• Gymnorebutia riograndensis (F.Ritter) Doweld
• Sulcorebutia riograndensis (F.Ritter) F.H.Brandt
• Weingartia lanata subs. riograndensis (F.Ritter) Donald
• Weingartia riograndensis F.Ritter

• Rebutia neocumingii subs. saipinensis (F.H.Brandt) D.R.Hunt
• Weingartia saipinensis F.H.Brandt

• Rebutia neocumingii subs. trollii (Oeser) D.R.Hunt
• Gymnorebutia neocumingii subs. trollii (Oeser) Doweld
• Weingartia neocumingii var. trollii (Oeser) Donald
• Weingartia trollii Oeser

Description: Weingartia hajekyanaSN|31083]]SN|31083]] n.n. is an undescribed name (nomen nudum) published in Karel Kníže seed catalog (field number KK1156) used to indicate one of the morphological or local form of Rebutia neocumingiiSN|3096]]SN|3096]] var. mairanensis|SN|15315]] (syn: Weingartia mairananaSN|15315]]SN|15315]]) This form has dense, more numerous, long, fine, straw-coloured spines, and profuse yellow to orange flowers. The flowers forms an irregular crown on the plant apex and have a hard time coming through the dense mass of spines. This cactus is indeed beautiful even without its blooms.
Derivation of specific name: Weingartia hajekyanaSN|31083]]SN|31083]] was named in honour of the Czech cactus expert F. Hájek. This plants are often found in cultivation under many different spelling such as: hajekijána or hajekyana.
Blooming season: The flowers are produced in early summer and remain open for five or six days.

Cultivation and Propagation: In culture Weingartia hajekyanaSN|31083]]SN|31083]] is without problems, easy to grow, very attractive and regularly shows its beautiful flowers, if provided with an adequate winter rest period.
Growth rate: It is a pretty slow grower.
Soil: Grow it in an open mineral, sandy-gritty cactus compost and provide a very good drainage.
Repotting: It is better that they are repotted regularly. Repotting will increase size of stems and the number of flowers produced. Repot yearly until reaching about 100 mm in size, then every two or three years will suffice. Repotting is best done at the end of winter but can be done at other times. Do not water for a couple of weeks after repotting to reduce risk of root rot via broken roots.
Pots: It needs a relatively shallow pot to accommodate its fibrous roots and provide a very good drainage. It may stay in the same pot for many years.
Moisture: It is sensitive to over-watering (rot prone), and needs good drainage. In the winter keep it cool, and absolutely dry conditions. In summer keep it well watered when it's hot. They are really not very demanding and regular watering in their growing season creates healthy disease resistant plants that will flower better.
Special need: Provide very good ventilation. Nearly all problems occur as a result of overwatering and poor ventilation, especially when weather conditions are dull and cool or very humid.
Fertilization: Light fertilizer seems to boost its growth whenever additional water is given. Feed it during the growing season with a fertilizer specifically formulated for cactus and succulents (high potash fertilizer with a dilute low nitrogen), including all micro nutrients and trace elements diluted to ½ the strength recommended on the label. It thrive in poor soils and needs a limited supplies of fertilizer to avoid the plant developing excess vegetation, which is easily attacked by fungal diseases.
Exposure: Needs full sun. To achieve the best spine density give these plants lots of sun.
Hardiness: Keep dry or slightly moist in winter at a minimum temperature of 5°C (But Hardy to -4°C or less). In mild climate they grow well when planted freely outside in well-drained soil.
Pest and diseases: Occasionally these plants are infested by mites and mealy-bugs, but all known garden pests can be kept to a minimum by simply ensuring optimal growing conditions and healthy plants.
Use: It can be cultivated outdoors in raised beds and terraces. It do well in pots as well.
Propagation: Seeds. The seeds can be sown in pots of fine, well-drained sandy soil, any time during the spring when temperatures are warm. Cover the seeds with a fine layer of grit and water from below with a fungicide to prevent damping off. For the 1-2 weeks cover the pots with a sheet of glass/clear perspex to keep the humidity levels high. Remove the glass and replace it with light shade-cloth and mist once or twice a day for the next two weeks after which most seeds should have germinated. From then on mistings can be reduced to every second and then every third day as the little plants grow. The seedlings should not be disturbed until they are well rooted after which they can be planted separately in small pots.