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Thelocactus flavus
(Syn: Thelocactus longispinus, Thelocactus panarottoanus)

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Thelocactus flavus (panarottoanus) PAN177B
 La Hincada, San Luis Potosí, Mexico
 

Description: Solitary or slightly clustering and forming small clumps up to 40 cm across.
Stem: Globose, single heads 5-12 cm wide, olive green to purplish
Ribs: Completely divided into tubercles arranged in 8 and 13 spirals,
Tubercles: Conical , basally rhomboid 8-17 mm long,
Areoles: With glands.
Central spines: 4, 15-80 mm long, ochre to greyish, straight or slightly curved, acicular.
Radial spines: 3-5, 7-35 mm long, ochre to greyish, straight, acicular.
Flowers: 30-45 mm wide, yellow. Anthers and stigma yellow

Flowering time:  Spring.
 
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Thelocactus flavus (Syn: Thelocactus longispinus)
Flowers are translucent yellow.

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Family: Cactaceae (Cactus Family)

Scientific Name (Basionym) :  Thelocactus flavus Mosco & Zanovello
In: Cactus & Co., 3: 20 (1999).

Holotype: Huizache, San Luis Potosi, Mexico, Kuenzler 362, cult. A. Mosco, November 1998 (HG-Pad).

Conservation status: Listed in CITES Appendix II

Origin: Mexico, San Luis Potosí, between Huizache and La Hincada.

Habitat: Grows in matorral xerofilo on limestone hills at elevations from 1200 to 1500 m.

Synonyms:
  • Thelocactus conothelos ssp. flavus (Mosco & Zanovello) Mosco & Zanovello,
    Publisched in: Bradleya 18: 63 (2000).
  • Thelocactus panarottoanus Halda,
    Publisched in:Acta Mus. Richnov. Sect. nat. 5: 161 (1998).
  • Thelocactus longispinus n. n.
    (Listed in Schmoll catalogue)
  • Thelocactus tulensis v. rinconadensis

Note:
T. flavus is strictly related to T. garciae This species has been well known for a long time and is sometimes listed in catalogues under the name Thelocactus longispinus n. n. which have also been distributed with the field number HK362.
It has always been misidentified as Thelocactus tulensis and considered a yellow flowering form of it. At a glance, flavus resembles tulensis in the epidermis colour and the long central spines, but the relationship stops here.
There are indeed many remarkable differences between the two species. In flavus the areoles bear one or two glands, missing in tulensis; the radial spines are quite different in number and arrangement; the flowers of flavus are yellow with the primary stamens inserted above the receptacle base, while the flowers of tulensis are white to pink with the primary stamens  inserted at the base of the receptacle. For the flower morphology and seed micro-morphology, flavus is, instead, referable to the Thelocactus conothelos complex. Thelocactus panarottoanus is the same.
 

 
 

 


 

Cultivation: Easy to cultivate. Water moderately from Spring to Autumn. Keep dry in winter, can tolerate frequent moderate frost, above approx -7C,  Sun Summer grower needs full sun exposures.

Reproduction: Nearly always from seed, since the plant rarely produces plantlets.


Photo of conspecific taxa, varieties, forms and cultivars of
(Thelocactus conothelos complexcomplex):

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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.