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Accepted Scientific Name: Echinomastus intertextus (Engelm.) Britton & Rose
Cactaceae (Britton & Rose) 3: 149 (1922) Britton & Rose
Origin and Habitat: Mexicó, Chihuahua (Localities: Janos, Seco, Ojo Caliente, San Lorenzo, Nuevo Piedras-Microonda Villa Ahumada and Santa Gertrudis). Field numbers KMR500, KMR543, KMR544, KMR545, VZD828, VZD695.
Altitude range: Around 1500-1600 metres above sea level.
Echinomastus intertextus (Engelm.) Britton & Rose
Cactaceae (Britton & Rose) 3: 149 (1922)
- Echinomastus intertextus (Engelm.) Britton & Rose
- Echinocactus intertextus Engelm.
- Neolloydia intertexta (Engelm.) L.D.Benson
- Pediocactus intertextus (Engelm.) Halda
- Sclerocactus intertextus (Engelm.) N.P.Taylor
- Thelocactus intertextus (Engelm.) W.T.Marshall
- Echinomastus intertextus subs. dasyacanthus (Engelm.) U.Guzmán
- Echinocactus intertextus var. dasyacanthus Engelm.
- Echinocactus intertextus f. dasyacanthus (Engelm.) Schelle
- Echinomastus dasyacanthus (Engelm.) Britton & Rose
- Echinomastus intertextus var. dasyacanthus (Engelm.) Backeb.
- Neolloydia intertexta var. dasyacantha (Engelm.) L.D.Benson
- Pediocactus intertextus var. dasyacanthus (Engelm.) Halda
- Sclerocactus intertextus var. dasyacanthus (Engelm.) N.P.Taylor
- Thelocactus dasyacanthus (Engelm.) W.T.Marshall
- Echinomastus intertextus f. minimus hort.
Description: Echinomastus intertextus is an interesting little plant, seldom more than 15 cm tall, with many stout spines that are tightly pressed against the round body of the stem. These spines obscure the stem giving the plant a pale pinkish appearance. Flowers are relatively small and white to pink in colour. The " minimum" is a smaller morphological form from Chihuahua (less than 5 cm tall), apart from a difference in size it is identical and not readily distinguishable from other Echinomastus intertextus, if not for the geographical provenance.
Habit: Almost always solitary, although they may occasionally branch once or twice, possibly as the result of injury.
Stem: Green, globose to somewhat cylindrical, c. 5 long when sexually mature and 2-5 cm in diameter with spines obscuring the stem. Top of flowering plant and young areoles very woolly.
Ribs: 11-13, somewhat acute, more or less divided into tubercles and extending 6-9 mm below the tubercles .
Tubercles: Tubercles protruding, nipple-like somewhat compressed.
Areoles: Elliptic to nearly circular with felted areolar groove 5 to 6 mm apart
Central spines: About 4, rigid, similar to the radials but slightly thicker, subulate to elliptical in cross section, of which 1 porrect lower central, and upper 3 pointing upward like radials 10-18 mm long, 0,2-0,5 mm thick, at first purplish red, passing to bluish grey, pinkish or greyish, with with darker tips, and contrasts nicely with the paler radial spines. The, reddish inner layers and spine tips may lend whole stems a dull and reddish hue, especially when the spines are wet.
Radial spines: 13-25 appressed, 8-15 mm long usually paler than the radials, of which 3 or 4 of the upper radial spines white or nearly so, more slender than the others, almost bristle-like. In in juveniles plants the radials are glabrous, appressed and the porrect lower central spine is often absent.
Flowers: As many as 20 simultaneously on the apex of a single stem, blooming in succession, several (up to about six) at a time, broadly funnelform, nearly as broad as long, 2,3-3,0 cm long, 2,5-3 cm in diameter, pink or pinkish white, 2-3 cm long, 2,5-3 cm in diameter, often with darker pinkish midregions and tinge. Ovary bearing a few ovate scales, scales in the tube red with white margins and with or without some wool in their axils. Outer perianth-segments about 20, broadly ovate, white-margined. Inner perianth-segments 20 to 25, oblong, mucronate white or pinkish, about 2,5 cm. long.. Filaments pale green; Anthers cream yellow. Style greenish, stigma-lobes 9, erect, truncate at apex bright red or pink.
Flowering season: Early spring. (in habitat late February through early April) for as many as 30 days. Individual flowers close at night and reopen for 2-3 days.
Fruits: Globose to ovoid fruits always in a mass of wool at the top of the plant, 8-15 mm green but upon ripening may turn tan to dull or pale reddish through-out or at the apex. The scales are few scarious and usually naked in their axils.
Seeds: Glossy black, papillate, nearly spherical to reniform seeds, 1-2 mm in diameter.
Subspecies, varieties, forms and cultivars of plants belonging to the Echinomastus intertextus group
- Echinomastus intertextus (Engelm.) Britton & Rose: has smooth addpressed radial spines bluish grey to pinkish, with with reddish tips. Distribution: southeastern Arizona, southern New Mexico, west Texas, and adjacent Mexico
- Echinomastus intertextus subs. dasyacanthus (Engelm.) U.Guzmán: has larger stems with relatively long, protruding spine which contrasts with the smooth aspect of typical E. intertextus. Distribution: Southwestern Texas, central and south-western New Mexico and in extreme northern Chihuahua (Mexico).
- Echinomastus intertextus f. minimus hort.: it is a small form less than 5 cm tall. Distribution: Chihuahua, Mexicó.
Bibliography: Major references and further lectures
1) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
2) 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
3) David R Hunt; Nigel P Taylor; Graham Charles; International Cactaceae Systematics Group. "The New Cactus Lexicon" dh books, 2006
4) Brian Loflin, Shirley Loflin “Texas Cacti: A Field Guide” Texas A&M University Press, 26/ott/2009
5) Albert Michael Powell, James F. Weedin “Cacti of the Trans-Pecos and Adjacent Areas” Texas Tech University Press, 2004
6) Del Weniger “Cacti of the Southwest: Texas, New Mexico, Oklahoma, Arkansas, and Louisiana” University of Texas Press, 1969
7) “Rare Plants of Texas: A Field Guide” Texas A&M University Press, 2007
8) Roland H. Wauer, Carl M. Fleming “Naturalist's Big Bend: An Introduction to the Trees and Shrubs, Wildflowers, Cacti, Mammals, Birds, Reptiles and Amphibians, Fish, and Insects“ Texas A&M University Press, 2002
9) Heil, K., Terry, M. & Corral-Díaz, R. 2013. Sclerocactus intertextus. In: IUCN 2013. "IUCN Red List of Threatened Species." Version 2013.2. <www.iucnredlist.org>. Downloaded on 16 February 2014.
Cultivation and Propagation: Echinomastus intertextus is a most beautiful cactus but rarely seen in cultivation. It is quite difficult to grow on its own roots. Very easily rot! It’s thought that’s better to watch this species in photo or in the natural habitat rather than to try to cultivate it. For this reasons the plant is often grafted on a frost hardy stock.
Soil: Use mineral well-permeable substratum with very little organic matter (peat, humus). It needs perfect drainage to flourish.
Repotting: Repotting every 2-3 years. As it is especially prone to rot under-pot in a smaller container filled with very porous compost. Use pot with good drainage.
Exposition: This plant need full sun and above all a very good ventilation, especially in winter. Tends to bronze in strong light, which encourages flowering and heavy spine production.
Watering: Water sparingly during the growing season and keep totally dry during winter. In the rest period no high atmospheric humidity!!Care must be taken with watering as they tends to become swollen and untidy in growth habit if given too much water and shade.
Fertilization: During the growing season enrich the soil using a fertilizer rich in potassium and phosphorous, but poor in nitrogen, because this chemical element doesn’t help the development of succulent plants, making them too soft and full of water.
Hardiness: It can tolerate temperature below zero (-15° C or less).
Pests & diseases: It may be attractive to a variety of insects to watch for:
- Red spiders: Sensitive to red spider mite. Overhead watering is helpful in controlling mites.
- Mealy bugs: Occasionally mealy bugs they 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.
- Rot: Rot it is the major threat. If the plants are not watered and “aired” correctly, fungicides won't help all that much. Mature individuals - if the growing conditions are not optimal, easily rot and die.
Remarks: Displaying your cacti on shelves has the added benefit of keeping them off the ground and away from potential rodent or snail damage.
Propagation: Seed or grafting. Seeds germinate in 7-14 days at 21-27° C in spring, remove the glass cover gradually as the plants develops and keep ventilated, no full sun for young plants! The seedlings should not be disturbed until they are well rooted, after which they can be planted separately in small pots. Seeds are relatively difficult to germinate (only a limited percentage of seeds germinate). Grafting is often used to speed growth rate and to create a back-up for plants in collection.
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