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  Thelocactus bicolor ssp. schottii
(Syn: Thelocactus schottii)
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Thelocactus bicolor
var. schottii
 

Description: Usually solitary cactus that are sometime branched from their base, globular, egg-shaped, conical to almost columnar-shaped, attaining a maximum height of 25 cm and up to 12 cm in diameter, but mostly smaller. The epithet "schottii" has been applied to the plants which are characterized by bearing (in mature specimens) a very long, flattened, papery upper spine up to 7 cm long, not, has been asserted, in its having a greater number of radial spines. No other differences have been reported, so that, this entity should be (probably) added to the synonymy of "bicolor".
Stem: Ovoidal, 8-20 cm tall, 5-12 cm wide.
Ribs: 8, distinct. Tubercles square-based rounded.
Areoles: With glands.
Central spines: 1, 75-90 mm long, red, flattened, papery.
Radial spines: 8-18, 25-60 mm long, ochre to reddish, straight, acicular.
Flowers: 55-110 mm wide, Petals are recurved, glossy intensely magenta (or rarely pink or red) with a red throat.
Blooming season: From early spring to summer. The blooms expand only in the afternoon of brilliant sunny days when temperatures are extremely hight. three or fours hours later, when light begins to wane, they close forever
Fruit: 10-20 mm long.

 

Cultivars: Thelocactus bicolor cv. INERMIS

Cultivation: It is a summer grower species easy to cultivate. Water regularly from Spring to Autumn, but do not overwater, can become too elongated if compost is too rich. Requires full sun or light shade and careful watering to keep plant compact with strong coloured spines. Needs good drainage and very porous potting mix, In Winter, keep dry.
 

Reproduction: From seed, since the plant rarely produces plantlets.

 

 

Photo gallery: Alphabetical listing of Cactus and Succulent pictures published in this site.

Photo gallery Thelocactus

 

 


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Family: Cactaceae (Cactus Family)
 

Scientific name:  Thelocactus bicolor (Galeotti ex N.E. Pfeiffer) Britt. & Rose var. schottii (Engelm.) Krainz,
In: Die Kakteen, Lfg. 18 (1961)

Origin:  Endemic from the Big Bend of the Trans Pecos, Texas, USA

Conservation status: Listed in CITES appendix 2.

Common English Names include: Glory of Texas

Synonyms:  
  • Thelocactus bicolor var. schottii Krainz
  • Echinocactus bicolor var. schottii Engelm.
    In: Proc. Amer. Acad. 3: 277 (preprint 1856).
  • Echinocactus schottii Small
    In: Fl. Southeast U. S. 814 (1903)
  • Thelocactus bicolor schottii Davis ex Backeb.
    In: Die Cactacecae V: 2809 (1961), nom. inval.
  • Thelocactus schottii (Engelmann) Kladiwa & Fittkau
    Published in: Krainz, Die Kakteen. CVIII b. 1. IV. (1975)


 

 


Photo of conspecific taxa, varieties, forms and
of plants belonging to the Thelocactus bicolor complex
(This Taxon has lots of synonyms ( like many other cacti) whit several controversial varieties and subspecies and comprises a multitude of different forms, but where each form is linked to others by populations of plants with intermediate characteristics):
 

  • T. bicolor var. bicolor (Frost hardiness -7C )
  • T. bicolor var. bolaensis (Frost hardiness -12C ) Origin: Coahuilafrom Sierra Bola, up to 20 cm tall.
  • T. bicolor var. commodus  It has been described as having only one, porrect, central spine, but with a careful observation it is possible to notice that the upper central spines are so appressed to the stem that they can be easily mistaken for radials.
  • T. bicolor var. ellipticus is referable to bicolor.
  • T. bicolor var. flavidispinus (Frost hardiness -12C ) Texas 8cm in diameter, 5cm tall.
  • T. bicolor var. heterochromus
  • T. bicolor var. pottsii (Referable to bicolor var. heterochromus).
  • T. bicolor var. rhodophthalmus is referable to bicolor.
  • T. bicolor var. schottii (Frost hardiness -12C) coming from the Big Bend area Texas, Chihuahua) characterized by a very long, papery upper spine.
  • T. bicolor var. schwarzii 1 0 F (-12C) Tamaulipas
  • T. bicolor var.  texensis is an invalid name for a Texas form.
  • T. bicolor var. tricolor (Frost hardiness -7C ) A form with bright red spines. Plants with these characters can be found around Saltillo, Coahuila.
  • T. bicolor var. zwakii,  It is not sufficiently distinct to deserve a subspecies rank.
Home | E-mail | Plant files | Mail Sale Catalogue | Links | Information | Search

All the information and photos in cactus art files are now available also in the new the Enciclopedia of Cacti. We hope you find this new site informative and useful.