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- Short Spines & Spineless
Since 4 Aug 2013

Origin and Habitat: Garden origin (Nursery produced cultivar)
Synonyms:
Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose
Bull. Torrey Bot. Club 49: 251. 1922
Synonymy: 20
- Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose
- Cactus bicolor Teran & Berland.
- Echinocactus bicolor Pfeiff. in Pfeiff. ex Pfeiff.
- Echinocactus rhodophthalmus Hook.
- Echinocactus rhodophthalmus var. ellipticus Hook.
- Ferocactus bicolor (Galeotti ex Pfeiff.) N.P.Taylor
- Hamatocactus bicolor I.M.Johnst.
- Thelomastus bicolor (Galeotti ex Pfeiff.) Frič in Kreuz.
- Thelocactus bicolor var. commodus R.Haas
- Thelocactus bicolor subs. commodus (R.Haas) Doweld
- Thelocactus bicolor var. schottii (Engelm.) Krainz in Krainz
- Echinocactus bicolor var. schottii Engelm.
- Echinocactus schottii Small
- Thelocactus schottii (Engelm.) Kladiwa & Fittkau
- Thelocactus bicolor subs. swobodae Halda & Horáček
- Thelocactus bicolor var. texensis Backeb.
- Thelocactus bicolor var. tricolor (K.Schum.) F.M.Knuth in Backeb. & F.M.Knuth
- Echinocactus bicolor var. tricolor K.Schum.
- Echinocactus bicolor f. tricolor (K.Schum.) Schelle
- Thelocactus bicolor subs. zwakii Chvastek & Halda
Thelocactus bicolor subs. bolaensis (C.Runge) Doweld
Sukkulenty 1(2): 30, 1999 ( bolansis )
Synonymy: 13
- Thelocactus bicolor subs. bolaensis (C.Runge) Doweld
- Echinocactus bicolor var. bolaensis (C.Runge) K.Schum.
- Echinocactus bicolor f. bolaensis (C.Runge) Schelle
- Echinocactus bolaensis C.Runge
- Ferocactus bicolor var. bolaensis (C.Runge) N.P.Taylor
- Thelocactus bicolor var. bolaensis (C.Runge) A.Berger
- Thelocactus bicolor var. bolansis (K.Schum.) F.M.Knuth
- Thelocactus bolansis hort.
- Thelomastus bicolor bolansis (C.Runge) Frič in Kreuz.
- Thelocactus bicolor var. wagnerianus (A.Berger) Krainz in Krainz
- Echinocactus wagnerianus var. A.Berger A.Berger
- Thelocactus wagnerianus A.Berger
- Thelomastus bicolor wagnerianus (A.Berger) Frič in Kreuz.
Thelocactus bicolor subs. flavidispinus (Backeb.) N.P.Taylor
Cactaceae Consensus Init. 5: 14. 1998
Synonymy: 4
- Thelocactus bicolor subs. flavidispinus (Backeb.) N.P.Taylor
- Ferocactus bicolor var. flavidispinus (Backeb.) N.P.Taylor
- Thelocactus bicolor var. flavidispinus Backeb.
- Thelocactus flavidispinus Backeb.
Thelocactus bicolor subs. heterochromus (F.A.C.Weber) Mosco & Zanov.
Bradleya 18: 62 (2000)
Synonymy: 11
- Thelocactus bicolor subs. heterochromus (F.A.C.Weber) Mosco & Zanov.
- Echinocactus heterochromus F.A.C.Weber
- Ferocactus heterochromus N.P.Taylor
- Thelocactus heterochromus (F.A.C.Weber) Oosten
- Thelomastus heterochromus (F.A.C.Weber) Frič in Kreuz.
- Thelocactus bicolor var. pottsii (Schur ex Salm-Dyck) Backeb.
- Echinocactus bicolor var. pottsii Schur ex Salm-Dyck
- Echinocactus bicolor f. pottsii (Schur ex Salm-Dyck) Voss in Vilm.
- Echinocactus pottsii Schur ex Salm-Dyck
- Thelocactus pottsii (Schur ex Salm-Dyck) Britton & Rose
- Thelocactus heterochromus longispinus
Thelocactus bicolor subs. schwarzii (Backeb.) N.P.Taylor
Cactaceae Consensus Init. 5: 14. 1998
Synonymy: 4
- Thelocactus bicolor subs. schwarzii (Backeb.) N.P.Taylor
- Ferocactus bicolor var. schwarzii (Backeb.) N.P.Taylor
- Thelocactus bicolor var. schwarzii (Backeb.) E.F.Anderson
- Thelocactus schwarzii Backeb.
Description: Thelocactus bicolorSN|3420]]SN|3420]] cv. inermis is a very distintive spineless form. It not only lacks spines but it also has odd fringed flowers often developing in pairs (or even more numerous) from the same areole. The frequent development of flowers buds in groups from the same areole and the nude appearance make this plant very different from the spiny standard Thelocactus bicolorSN|3420]]SN|3420]]. At the first glance it is really difficult to say that it is a Thelocactus.
Habit: It is a solitary or few branched cactus.
Stem: Globose, ovoidal or slightly pyramidal,8-20 cm tall, 5-12 cm wide, olive-green to purple, depending on the time in the growing season and the amount of sun and water, woolly apex. The base becomes corky with age.
Ribs: 8, distinct.
Tubercles: Rounded, with a woolly groove on the upper side. The axil is naked. With glands.
Areoles: Elongate up to 8 mm long.
Central spines: Completely lacking, or infrequently one solitary central spine.
Radial spines: Absent.
Flowers: 55-110 mm wide, with bizarre shapes in shades of pale-pink to rich-magenta, petals with feathered edges, petals may curl in odd directions, twist or wave, and colours may exhibit flame variations for multiple hues.
Blooming season: Early spring to autumn.
Subspecies, varieties, forms and cultivars of plants belonging to the Thelocactus bicolor group
Thelocactus bicolor (Galeotti ex Pfeiff.) Britton & Rose: (subsp. bicolor) has extremely variable spination, 1-4 central spines, 8-15 radials, and usually bicolored flowers; Distribution: Chihuahuan Desert of Texas and Mexico and in the Tamaulipan thorn shrub vegetation along the Rio Grande.
Thelocactus bicolor subs. bolaensis (C.Runge) Doweld: has dense, strong, and white spination. Distribution: Sierra Bola in Coahuila
Thelocactus bicolor var. commodus R.Haas: It has been described as having only one central spine, but there are 2 upper central spines so appressed to the stem that they can be easily mistaken for radials. Therefore it has three central spines and its maintenance at variety rank is not justified. Distribution: near Montemorelos, Tamaulipas, outside the limits of the Chihuahuan Desert.
Thelocactus bicolor subs. flavidispinus (Backeb.) N.P.Taylor: has spines covering the entire plant, 3 central spines, 12-17 radials, and (usually) bicolored flowers; Distribution: Chihuahuan Desert vegetation in Texas and, possibly, neighboring Mexico.
Thelocactus bicolor subs. heterochromus (F.A.C.Weber) Mosco & Zanov.: has stems with wider ribs and stouter, subulate, spines banded in red. Distribution: Coahuila and Durango (This is the westernmost taxon in the genus)
Thelocactus bicolor var. pottsii (Schur ex Salm-Dyck) Backeb.: intermediate plants between heterochromus and bicolor, but definitely belong to heterochromus for their lack of areolar glands. Distribution: Chihuahua
Thelocactus bicolor var. schottii (Engelm.) Krainz in Krainz: It is characterized by a very long, papery upper spine. Distribution: Big Bend area
Thelocactus bicolor subs. schwarzii (Backeb.) N.P.Taylor: has no central spines (may however appear sporadically), 13-14 radials, and tricolored flowers. Distribution: Tamaulipas east of the Sierra Madre Oriental.
- Thelocactus bicolor subs. swobodae Halda & Horáček
Thelocactus bicolor var. texensis Backeb.: Texensis is an invalid name published by Backeberg applying to a Texas form.
Thelocactus bicolor var. tricolor (K.Schum.) F.M.Knuth in Backeb. & F.M.Knuth: it is a form with bright red spines. Distribution: Saltillo, Coahuila.
Thelocactus bicolor var. wagnerianus (A.Berger) Krainz in Krainz: it is differentiated from Thelocactus bolaensis for its columnar stem, the reddish spines and the lack of flattened spines. Distribution: west of Saltillo, Coahuila
- Thelocactus bicolor subs. zwakii Chvastek & Halda: it has smaller stem and flowers . It is not sufficiently distinct to deserve a subspecies rank. Distribution: Castanos in Coahuila.
Thelocactus bicolor cv. albiflorus: white flowering form. Garden origin.
Thelocactus bicolor cv. inermis: Spineless cultivar with flamboyant jagged flowers.
Thelocactus heterochromus longispinus
Bibliography: Major references and further lectures
1) Edward F. Anderson “The Cactus Family” Timber Press, 2001
2) Curt Backeberg “Cactus Lexicon” Sterling Publishing Company, Incorporated, 1978
3) David Hunt, Nigel Taylor “The New Cactus Lexicon” DH Books, 2006 ISBN 0953813444, 9780953813445
4) 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

Thelocactus bicolor cv. inermis Photo by: Valentino Vallicelli

Thelocactus bicolor cv. inermis Photo by: Diego Armentano

Thelocactus bicolor cv. inermis Photo by: Valentino Vallicelli

Thelocactus bicolor cv. inermis Photo by: Cactus Art

- Spineless cultivar with flamboyant jagged flowers. Photo by: Valentino Vallicelli

Thelocactus bicolor cv. inermis Photo by: Valentino Vallicelli
Cultivation and Propagation: Thelocactus bicolorSN|3420]]SN|3420]] is a summer grower species easy to cultivate, more cold tolerant than most and less fussy regarding soil conditions.
Growth rate: It is a relatively slow growing.
Soils: It likes very porous standard cactus mix soil, but can become too elongated if compost is too rich.
Repotting: Use pot with good drainage.
Watering: Water regularly from Spring to Autumn, but do not overwater(Rot prone), keep dry in winter.
Fertilization: Feed with a high potassium fertilizer in summer.
Hardiness: Reputedly somewhat resistant to frost if kept on the dry side prior to, and during, cold weather (hardy to -7 C ° C, or less for short periods).
Exposition: Requires full sun or light shade and careful watering to keep plant compact. Tends to bronze in strong light, which encourages flowering.
Uses: It is an excellent plant for container growing. It always looks good and stays small. It look fine in a cold greenhouse and frame.
Pests & diseases: It may be attractive to a variety of insects, but plants in good condition should be nearly pest-free, particularly if they are grown in a mineral potting-mix, with good exposure and ventilation. Nonetheless, there are several pests to watch for:
- Red spiders: Red sopiders may be effectively rubbed up by watering the infested plants from above.
- Mealy bugs: Mealy bugs occasionally develop aerial into the new growth among the wool with disfiguring results, but the worst types develop underground on the roots and are invisible except by their effects.
- Sciara Flies: Sciara flies are one of the major problems for seedlings. It is a good practice to mulch your seedlings with a layer of grit, which will strongly discourage the flies.
- Scales: Scales are rarely a problem.
- Rot: Rot is only a minor problem with cacti if the plants are watered and “aired” correctly. If they are not, fungicides won't help all that much.
Propagation: Graft or (rarely) cuttings if available. The cutting should not be disturbed until they are well rooted after which they can be planted separately in small pots.
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