{"product_id":"ariocarpus-retusus-ariocarpus-trigonus-var-horacekii-matehuala-san-luis-potosi-collector-cactus-growing-in-4-inch","title":"Ariocarpus retusus | Ariocarpus trigonus var. horacekii | Matehuala, San Luis Potosí | Collector Cactus Growing in 4 Inch","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eAriocarpus trigonus var. horacekii\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a compact geographic form from \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSan Luis Potosí, Mexico\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, traditionally valued by collectors for its smaller stature, strongly pointed tubercles, and elegant pale yellow to creamy flowers. Although historically associated with \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eAriocarpus trigonus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e, modern taxonomy places this plant within \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAriocarpus retusus\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, making it an excellent example of the considerable natural variation found throughout the \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eretusus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e complex.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePlants are typically solitary and grow as low, depressed rosettes of yellow-green to gray-green tubercles. The tubercles are smooth, elongated, sharply pointed, and often strongly incurved, giving mature specimens a distinctly star-like architectural appearance. Compared with typical \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eA. trigonus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e, plants historically called \u003c\/span\u003e\u003cem\u003e\u003cspan\u003ehoracekii\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e are especially noted for their \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003esmaller overall body size\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e while retaining the long, triangular tubercles and pale flowers associated with that 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\u003cspan\u003eThe \u003c\/span\u003e\u003cem\u003e\u003cspan\u003ehoracekii\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e population originates from \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSan Luis Potosí, Mexico\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, particularly the region \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003esouth of Matehuala\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Type information for the later name \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eAriocarpus retusus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e ssp. \u003c\/span\u003e\u003cem\u003e\u003cspan\u003ehoracekii\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e places the material in the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003evicinity of Matehuala and Palmas\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with the type associated with the field collection \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eP. Panarotto PP851028\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThis region lies within the dry interior of northeastern Mexico, where \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eAriocarpus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e grows in open desert and dry-shrubland environments. The plants remain low to the ground and rely on a substantial taproot and extremely well-drained mineral soils to endure prolonged drought and strongly seasonal rainfall. \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 generally flower during \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003elate autumn into early winter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, producing satiny \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecream-white, yellowish-white, or pale yellow flowers\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, occasionally with reddish midstripes on the outer tepals. Flowers are typically around \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3–5 cm (1.2–2 inches) across\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and emerge from the woolly center of the rosette.\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.\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 highly porous, predominantly mineral substrate consisting of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003epumice, coarse grit, decomposed granite, fine gravel, and a small proportion of mineral loam or similar material\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Excellent drainage is critical, as prolonged moisture around the large root system can quickly lead to rot.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edeep container\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is strongly recommended to accommodate the substantial taproot. Avoid rich, moisture-retentive soils, particularly during cool weather.\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 8–10\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e when grown outdoors under suitably dry conditions. Established plants can tolerate brief temperatures approaching \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e14°F (-10°C)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e when completely dry, but prolonged freezing combined with moisture should be avoided.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecool, completely dry winter rest\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is important for maintaining healthy roots and promoting the plant’s naturally compact growth habit.\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 strong filtered sun\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with mature, acclimated plants tolerating substantial direct sunlight. Strong light encourages low, compact growth and helps prevent the elevated, overly lush appearance sometimes seen in plants grown under insufficient light.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIn very hot climates, some protection from intense afternoon sun is beneficial, particularly for young seedlings and greenhouse-grown plants that have not been gradually acclimated.\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 produces the most natural growth form and preserves genetic variation within the population. Seedlings develop slowly and benefit from somewhat gentler light and more consistent moisture during their earliest stages.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eGrafting can significantly accelerate growth and flowering, but grafted plants often become taller and more inflated than specimens grown naturally on their own roots. For collectors seeking the characteristic compact form, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eseed-grown plants on their own roots are preferred\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\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 taxonomic history of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ehoracekii\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is unusually complicated. \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eJosef Jakob Halda\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e first published the name \u003c\/span\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eAriocarpus trigonus\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e var. \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003ehoracekii\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cspan\u003e in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1997\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The following year, several alternative combinations appeared, including \u003c\/span\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eAriocarpus elongatus\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\u003ehoracekii\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eAriocarpus retusus\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\u003ehoracekii\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cspan\u003e. The latter was published by Halda and Panarotto in 1998 using material collected by \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eP. Panarotto under field number PP851028\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e from the Matehuala–Palmas area of San Luis Potosí. The epithet honors \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eL. Horáček\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eKew's Plants of the World Online currently accepts \u003c\/span\u003e\u003c\/strong\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eAriocarpus retusus\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e as the taxonomic placement for the horacekii names\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, treating both \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eA. trigonus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e var. \u003c\/span\u003e\u003cem\u003e\u003cspan\u003ehoracekii\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eA. retusus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e ssp. \u003c\/span\u003e\u003cem\u003e\u003cspan\u003ehoracekii\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e as synonyms. Interestingly, Kew simultaneously recognizes \u003c\/span\u003e\u003cem\u003e\u003cstrong\u003e\u003cspan\u003eAriocarpus trigonus\u003c\/span\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cspan\u003e itself as a distinct species\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, native primarily to Tamaulipas and Nuevo León. This means the San Luis Potosí \u003c\/span\u003e\u003cem\u003e\u003cspan\u003ehoracekii\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e population is presently considered part of \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eA. retusus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e rather than \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eA. trigonus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e under Kew's treatment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDespite its lack of current formal taxonomic recognition, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ehoracekii remains a useful and well-established collector name\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for this compact Matehuala-area population, preserving valuable information about its geographic origin and distinctive morphology.\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":"Default Title","offer_id":47336099381417,"sku":null,"price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0217\/7391\/0096\/files\/20260720_173817.jpg?v=1786237009","url":"https:\/\/prsucculents.com\/products\/ariocarpus-retusus-ariocarpus-trigonus-var-horacekii-matehuala-san-luis-potosi-collector-cactus-growing-in-4-inch","provider":"Phoenix Rising Succulents","version":"1.0","type":"link"}