Weingartia lanata subs. pilcomayensis

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Since 4 Aug 2013

Weingartia lanata subs. pilcomayensis (Cárdenas) Donald
Ashingtonia 3 (Weingartia Suppl.): 138, 129. 1978
Family: CACTACEAE

Accepted Scientific Name: Rebutia neocumingii subs. pilcomayensis (Cárdenas) D.R.Hunt
Cactaceae Consensus Init. 4: 8. 1997 [Oct 1997]

Weingartia lanata subs. pilcomayensis (Rebutia neocumingii subs. pilcomayensis) Photo by: Valentino Vallicelli

Origin and Habitat: Otuyo, Sotomayor, Yamparaez (Chuquisaca) and Arinal, Kota, Sotomayor (Potosi) Bolivia
Altitude: 2100-2700 meters above sea level.

Synonyms:

Rebutia neocumingii subs. pilcomayensis (Cárdenas) D.R.Hunt

Sulcorebutia pilcomayensis (Cárdenas) F.H.Brandt
Weingartia lanata subs. pilcomayensis (Cárdenas) Donald
Weingartia pilcomayensis Cárdenas

See all synonyms of Rebutia neocumingii

Description: Clustering very woolly cactus with bright yellow flower. Weingartia pilcomayensisSN|15325]]SN|15328]] is probably very closely related (if not the same) to Weingartia lanataSN|15328]]SN|15325]].
Stems: Short-cylindrical up to 20 cm tall with few and broad spiraling ribs with prominent chins.
Areoeles: Large with substantial wool present similar in this respect to W. lanata and W. platygona giving a woollier crown than for W. neocumingii.
Spines: Numerous, more than 24, both radial and central spines are fine yellowish, strong and curved.
Flower: Yellow or pale orange, funnel-shaped 2,5 cm across (or more and usually larger than W. neocumingii), with reddish edged scales, they are produced (unusually) all over the body of the plant expecially near the very tips of the stems differing from other rebutias in that its flowers appear very near the meristem as opposed to the lower, stemside and base locations of those others.
Blooming season: The flowers are produced in early summer and remain open for five or six days.

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Subspecies, varieties, forms and cultivars of plants belonging to the Rebutia neocumingii group

Rebutia corroana Cárdenas: has hemispherical body with more woolly crown, fewer and stiffer spines, yellow flowers with green scales on the receptacle. Distribution: Bolivia (Cochabamba and Santa Cruz).
Rebutia neocumingii (Backeb.) D.R.Hunt: (Subsp. neocumingii) it is quite variable as to its spines and subtle differences of tone in its yellow to orange flowers. Distribution: widespread in Bolivia and Peru.
Rebutia neocumingii subs. lanata (F.Ritter) D.R.Hunt: has with very woolly apexes and areoles. It is very variable as to its spines and subtle differences of tone in its yellow to orange flowers. Distribution. Chuquisaca and Potosi, Bolivia.
Rebutia neocumingii subs. pilcomayensis (Cárdenas) D.R.Hunt: has 12-15 radials and golden yellow flowers. Distribution: Potosi, Bolivia.
Rebutia neocumingii subs. pulquinensis (Cárdenas) D.R.Hunt
Rebutia neocumingii subs. riograndensis (F.Ritter) D.R.Hunt: has few radials, usually only 5-10. Distribution: Santa Cruz, Bolivia.
Rebutia neocumingii subs. saipinensis (F.H.Brandt) D.R.Hunt: has not less than 20 radials and golden yellow flowers. Distribution: Cochabamba, Bolivia.
Rebutia neocumingii subs. trollii (Oeser) D.R.Hunt: This form is characterized by bright orange to orange-scarlet flowers. Distribution: Chuquisaca, Bolivia.
Weingartia hajekyana: has dense, more numerous, long, fine, straw-coloured spines (= Rebutia neocumingii var. mairanensis). Distribution: Mairana, Bolivia
Weingartia hediniana Backeb.: has somewhat fatter tubercles and many yellow flowers. Distribution: Chuquisaca and Potosi. Bolivia.
Weingartia longigibba F.Ritter: has clustering bodies with large and prominent tubercles. It is similar to Weingartia riograndensis. Distribution: Bolivia, Department Chuquisaca, Province of Oropeza.
Weingartia mairanana (Donald) F.H.Brandt: has very dense, more numerous spines, winch are longer, finer and straw-coloured. Distribution: Mairana, Florida, Santa Cruz, Bolivia.
Weingartia neocumingii var. koehresii Oeser: has more numerous but shorter spines and yellow blooms. Distribution: Quillaquila, Oropeza, Chuquisaca, Bolivia.
Weingartia neocumingii f. prolifera hort.: it is a monstrous highly branching variety that forms large clumps and blooms abundantly, just as a small specimen. Distribution: Known only in cultivation.
Weingartia platygona Cárdenas: is very similar, if no the same as Weingartia pilcomayensis. Distribution: Millares, Potosi, Bolivia.
Weingartia pruinosa hort.: has finer straw-coloured or brownish spines which are very dense and more numerous. Distribution: Oropeza, Chuquichuqui, Bolivia.
Weingartia sp. KA381 Icla, altitude 2630m: has large tuberous root and the less numerous and larger tubercled ribs. Distribution: Icla, Chuquisaca, Bolivia.

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Notes: The Weingatia pilcomayensis is very similar to Weingatia lanata but is not part of the typical population of W. lanata around Chuquichuqui, in fact it comes from Puente Pilcomaya on the Rio Pilcomayo on the south of Sucre.

Bibliography: Major references and further lectures
1) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
2) James Cullen, Sabina G. Knees, H. Suzanne Cubey "The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass" Cambridge University Press, 11/Aug/2011
3) David R Hunt; Nigel P Taylor; Graham Charles; International Cactaceae Systematics Group. "The New Cactus Lexicon" dh books, 2006

Weingartia lanata subs. pilcomayensis (Rebutia neocumingii subs. pilcomayensis) Photo by: Cactus Art

Weingartia lanata subs. pilcomayensis (Rebutia neocumingii subs. pilcomayensis) Photo by: Cactus Art

Weingartia lanata subs. pilcomayensis (Rebutia neocumingii subs. pilcomayensis) Photo by: Cactus Art

Weingartia lanata subs. pilcomayensis (Rebutia neocumingii subs. pilcomayensis) Photo by: Cactus Art

KK 829 (Collector: Karel Kníže) Locality: Otuyo, Bolivia, Altitude: 2500m (Rebutia neocumingii subs. pilcomayensis) Photo by: Cactus Art

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Cultivation and Propagation: In culture it 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.

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Cite this page: "Weingartia lanata subs. pilcomayensis" Text available under a CC-BY-SA Creative Commons Attribution License. www.llifle.com 14 Nov. 2005. 01 Mar 2025. </Encyclopedia/CACTI/Family/Cactaceae/15330/Weingartia_lanata_subs._pilcomayensis>