Echinomastus intertextus

(Engelmann) Britton & Rose

Cact. 3: 149. 1922.

Illustrated
Basionym: Echinocactus intertextus Engelmann Proc. Amer. Acad. Arts 3: 277. 1856
Synonyms: Neolloydia intertexta (Engelmann) L. D. Benson Sclerocactus intertextus (Engelmann) N. P. Taylor
Treatment appears in FNA Volume 4. Treatment on page 196. Mentioned on page 192, 193, 195, 217.

Stems 5–17 (–20) × 3–10 cm; ribs ca. 13; areoles (5–) 9–11 mm apart along ribs; areolar glands absent. Spines 20–29 per areole, dull tan to pale gray, pinkish, or reddish-brown (rarely dull white or straw colored), usually tipped reddish-brown; radial spines 13–25 per areole; abaxial (shortest) radial spine 5–13 × 0.2–0.4 mm; adaxial and lateral (longest) radial spines 9–20 mm; central spines (3–) 4 per areole, abaxial central spine porrect, straight or nearly so, (0–) 0.5–14 (–20) mm; others 10–18 (–20) × 0.2–0.5 mm. Flowers 2.5–3 (–3.8) × 2.5–3 (–3.8) cm; inner tepals silvery white to pale lavender pink (rarely white with pale-pink midstripes), 1.3–2.5 cm × (1–) 3–5.5 mm; stigma lobes bright red or pink (rarely white). Fruits immediately dehiscent through wide basal pore (= circumscissile abscission scar), ± spheric, 6–15 × (6–) 8–15 mm. 2n = 22.

Distribution

V4 368-distribution-map.gif

Ariz., N.Mex., Tex., n Mexico

Discussion

Varieties 2 (2 in the flora).

The mature part of the stem of Echinomastus intertextus is sometimes positioned above ground level on a stalklike proximal part of the stem, which often remains narrowly cylindric while the distal part broadens to the normal diameter of the adult stem. This contrasts with the other species of Echinomastus, which lack a stalklike stem portion between the roots and mature part of the stem. Many populations of E. intertextus are intermediate between the two varieties, i.e., they contain a wide range of central spine lengths. Consequently, sampling error (usually only one specimen from each population) created the illusion of extensive sympatry between long-spined and short-spined varieties.

Selected References

None.

Key

1 Radial spines and adaxial central spines closely appressed; abaxial, porrect central spine 0.5-4(-5) mm Echinomastus intertextus var. intertextu
1 Radial and adaxial central spines diffusely spreading; abaxial, porrect central spine 4-15(-20) mm Echinomastus intertextus var. dasyacanth
... more about "Echinomastus intertextus"
1.4 cm14 mm <br />0.014 m <br /> (2 cm20 mm <br />0.02 m <br />) +
nearly +  and straight +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (2 cm20 mm <br />0.02 m <br />) +
cushionlike +
circular to linear +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
deciduous +  and persistent +
hourglass--shaped +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
Allan D. Zimmerman +  and Bruce D. Parfitt +
(Engelmann) Britton & Rose +
hardened +
Echinocactus intertextus +
triangular +
curved +  and straight +
proliferating +
flattened +  and cylindric +
mucilaginous +
firm +  and hard +
connected +
divided +  and notched +
Ariz. +, N.Mex. +, Tex. +  and n Mexico +
not separating +
3 cm30 mm <br />0.03 m <br /> (3.8 cm38 mm <br />0.038 m <br />) +
3 cm30 mm <br />0.03 m <br /> (3.8 cm38 mm <br />0.038 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (3 cm30 mm <br />0.03 m <br />) +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (15 cm150 mm <br />0.15 m <br />) +
2.5cm;3cm +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
pink;dull;brown;pink;dull;brown;green +
persistent +, long +  and deciduous +
6mm;15mm +
spheric +
succulent +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
obscured +  and obliterated +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
1.3 cm13 mm <br />0.013 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
deciduous +  and persistent +
rudimentary +
flat +  and terete +
nearly +  and microscopic +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
tuberculate +
fluted;spheric;depressed-spheric or club-shaped +
1.8 cm18 mm <br />0.018 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
deciduous +  and persistent +
mucilaginous +
ridgelike +  and nipple--shaped +
1 +  and 20 +
triangular +
arillate +  and strophiolate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
hemispheric;spheric +
Illustrated +
tipped reddish-brown +, tan +  and pale gray pinkish or reddish-brown +
curved +  and straight +
deciduous +  and persistent +
5mm +  and 13mm +
13 (?) +  and 25 (?) +
annulate-ridged +, hairlike +, daggerlike +, subulate +  and acicular +
0.3 cm3 mm <br />0.003 m <br /> (3.7 cm37 mm <br />0.037 m <br />) +
hard +  and rigid +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
decurrent +
unsegmented +
5cm;17cm +
cylindric +, ovoid +  and spheric +
succulent +
3cm;10cm +
pink +  and bright red +
tuberculate +
Neolloydia intertexta +  and Sclerocactus intertextus +
adventitious +
tuberlike +
epipetric +  and epiphytic +
Echinomastus intertextus +
Echinomastus +
species +
undulate +  and entire +
dull +  and glossy +
epiphytic;epiphytic;epiphytic +
not deep-seated +
barrel-shaped +  and spheric +