{"product_id":"thelocactus-conothelos-ssp-flavus-yellow-flowered-san-luis-potosi-collector-cactus","title":"Thelocactus conothelos ssp. flavus | Yellow-Flowered San Luis Potosí Collector Cactus","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus conothelos ssp. flavus\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a distinctive yellow-flowered member of the \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eThelocactus conothelos\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e complex from \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSan Luis Potosí, Mexico\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. It is immediately recognizable by its strongly tuberculate olive-green to purplish body, long open spination, and brilliant clear-yellow flowers. Plants are usually solitary when young but may slowly branch from the base with age, eventually developing into attractive multiheaded specimens.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe ribs are completely divided into prominent conical tubercles arranged in spirals, giving the plant a strongly geometric appearance. Each areole carries several long, slender central and radial spines that range from ochre to gray and may reach impressive lengths on mature plants. This combination of exaggerated tubercles, long needle-like spines, and luminous yellow flowers makes ssp. \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eflavus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e one of the most recognizable forms within the \u003c\/span\u003e\u003cem\u003e\u003cspan\u003econothelos\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e group.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eNative Habitat:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus conothelos ssp. flavus\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e has a highly localized distribution in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSan Luis Potosí\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, occurring in a relatively small area between \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eEntronque Huizache and La Hincada\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e at approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1,200–1,600 meters (3,940–5,250 feet)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e elevation. Plants inhabit \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003exerophytic scrub on rocky limestone hills\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e within the southern portion of the Chihuahuan Desert, where shallow mineral soils, intense sunlight, seasonal rainfall, and rapid drainage create demanding growing conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe broader \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHuizache region\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is one of the most cactus-rich landscapes known in North America, with approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e75 native cactus species\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e documented within the study area. Notable cacti and xerophytes recorded from this region include \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAriocarpus bravoanus, Ariocarpus kotschoubeyanus, Ariocarpus retusus, Astrophytum myriostigma, Echinocactus horizonthalonius, Echinocactus platyacanthus, Leuchtenbergia principis, Lophophora williamsii, Epithelantha micromeris,\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and numerous species of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eEchinocereus, Ferocactus,\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMammillaria\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eFlowering Information:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eMature plants flower primarily during \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003espring\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, producing brilliant \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eyellow flowers approximately 3–4.5 cm (1.2–1.8 inches) across\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Both the anthers and stigma are yellow, creating a nearly uniform golden floral display that contrasts beautifully against the darker epidermis and grayish spines.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe flowers are \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ehermaphroditic\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, containing functional stamens and a functional pistil. One particularly interesting feature of this group is the position of the primary stamens above the base of the floral receptacle, a characteristic that helped establish its relationship to the \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eThelocactus conothelos\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e complex rather than to \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eThelocactus tulensis\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e, with which these plants were historically confused.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eSoil Type:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eGrow in a sharply draining, predominantly mineral substrate composed of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003epumice, coarse limestone gravel, decomposed granite, coarse grit, and only a modest amount of organic material\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Excellent drainage and strong root-zone aeration are essential.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAllow the substrate to dry thoroughly between waterings. Water moderately during active spring and summer growth, then reduce watering substantially as temperatures cool. Avoid prolonged moisture during winter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eHardiness:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eBest suited to approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eUSDA Zones 9–11\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Established plants can tolerate \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ebrief temperatures near 20°F (-7°C) when completely dry\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, but prolonged freezing temperatures and cold, wet soil should be avoided.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecool, dry winter dormancy\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e encourages compact growth, healthy roots, and reliable spring flowering.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eLight Requirements:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eThrives in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ebright light to full sun\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Strong illumination encourages compact growth, robust spination, and dependable flowering.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePlants grown under greenhouse conditions should be gradually acclimated before exposure to intense outdoor sunlight. In exceptionally hot climates, some light afternoon protection can reduce heat stress without compromising the plant's natural form.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003ePropagation:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003ePropagation is primarily from \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eseed\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, which is the most dependable method for this taxon. Plants only rarely produce basal offsets, although older specimens may occasionally branch and form small clusters.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eSeed-grown specimens display natural variation in spine length, body coloration, and growth habit and are preferred for maintaining the characteristics of this localized San Luis Potosí population.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eCollector's Note:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eThe yellow-flowered plants now known as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus conothelos ssp. flavus\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e circulated in cultivation for many years before their taxonomic identity was clarified. They were sometimes distributed under the unpublished name \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus longispinus\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and were also confused with \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eThelocactus tulensis\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e because of their long spines and superficially similar bodies. Detailed study of their flowers and seed morphology demonstrated that they belong instead to the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus conothelos complex\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eJosef Halda described the same San Luis Potosí plant as \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus panarottoanus\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e in 1998.\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Alessandro Mosco and Carlo Zanovello independently described it as \u003c\/span\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus flavus\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e in 1999\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, based on material associated with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHuizache and collection HK 362\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, and subsequently published the combination \u003c\/span\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus conothelos\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e ssp. \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eflavus\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e in 2000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. At subspecies rank, \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eflavus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e became the familiar name used by many collectors for the Huizache–La Hincada populations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eKew's Plants of the World Online currently takes a broader taxonomic view and treats \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus conothelos\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e ssp. \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eflavus\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e, \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus flavus\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e, and \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus panarottoanus\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e as synonyms of the accepted \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eThelocactus conothelos\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e ssp. \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eaurantiacus\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The name \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003essp. flavus\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e nevertheless remains useful in horticulture because it identifies the geographically localized San Luis Potosí plants with their characteristic long spines and clear yellow flowers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eThis is for one plant similar to the one shown growing in a 4\" inch container shipped bare root. All of our plants are guaranteed pest-free and healthy upon delivery, and we ship within the United States. Shipping is done Monday thru Friday.\u003cbr\u003eAny questions please ask.\u003cbr\u003e#prsucculents\u003c\/p\u003e","brand":"Phoenix Rising Succulents","offers":[{"title":"4 Inch","offer_id":47336771256489,"sku":null,"price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0217\/7391\/0096\/files\/20260720_174153.jpg?v=1786309369","url":"https:\/\/prsucculents.com\/products\/thelocactus-conothelos-ssp-flavus-yellow-flowered-san-luis-potosi-collector-cactus","provider":"Phoenix Rising Succulents","version":"1.0","type":"link"}