Difference between revisions of "Grusonia aggeria"
Cact. Succ. J. (Los Angeles) 71: 325. 1999.
Basionym: Opuntia aggeria Ralston & Hilsenbeck Madroño 36: 226, fig. 2. 1989
Treatment appears in FNA Volume 4. Treatment on page 119.
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|name=Opuntia aggeria | |name=Opuntia aggeria | ||
|authority=Ralston & Hilsenbeck | |authority=Ralston & Hilsenbeck | ||
| + | |rank=species | ||
| + | |publication_title=Madroño | ||
| + | |publication_place=36: 226, fig. 2. 1989 | ||
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Shrubs,</b> forming clumps, 3–9 cm. <b>Roots</b> tuberlike, 7–8 × 2.5–3 cm. <b>Stem</b> segments short cylindric to clavate, 3.5–9 × 1.5–3 cm; tubercles 8–18(–22) mm; areoles circular 3–4 mm in diam.; wool yellowish white. <b>Spines</b> (1–)5–15 per areole, mostly in distal areoles, 3–5 cm; major 1–3 abaxial spines deflexed, usually chalky white (at least adaxially), flattened to angular-flattened, longest central abaxial spine commonly twisted or curved (at times the only spine in depauperate specimens, those mostly from Big Bend region of Texas); major 0–5 adaxial spines divergent, ascending, brown to blackish and sometimes chalky, ± terete. <b>Glochids</b> adaxial in areole, yellow, to 4 mm. <b>Flowers</b>: inner tepals bright yellow, 25 mm; filaments green; style cream; stigma lobes pale yellow-green. <b>Fruits</b> yellow, aging gray, cylindric to ellipsoid, 20–25(–50) × 10–15 mm, becoming dry, spineless, glochidiate; areoles 25–35. <b>Seeds</b> yellowish to brownish, ± circular, to 5 mm in diam., with various numbers and sizes of bumps. <b>2n</b> = 22.</span><!-- |
-->{{Treatment/Body | -->{{Treatment/Body | ||
| + | |phenology=Flowering spring (Mar–May). | ||
|habitat=Chihuahuan Desert, sandy or gravelly flats, scrub with creosote bush, lower slopes, limestone or igneous substrates | |habitat=Chihuahuan Desert, sandy or gravelly flats, scrub with creosote bush, lower slopes, limestone or igneous substrates | ||
|elevation=600-1500 m | |elevation=600-1500 m | ||
|distribution=Tex.;Mexico (Coahuila). | |distribution=Tex.;Mexico (Coahuila). | ||
| − | |discussion=<p>Grusonia aggeria is based on the “type” of | + | |discussion=<p><i>Grusonia aggeria</i> is based on the “type” of “<i>Opuntia</i> grahamii × O. schottii” described by M. S. Anthony (1956). It is not a hybrid, however, between the two tetraploid putative parental taxa; it is instead a fully fertile, diploid species.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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name=Grusonia aggeria | name=Grusonia aggeria | ||
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|authority=(Ralston & Hilsenbeck) E. F. Anderson | |authority=(Ralston & Hilsenbeck) E. F. Anderson | ||
|rank=species | |rank=species | ||
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|basionyms=Opuntia aggeria | |basionyms=Opuntia aggeria | ||
|family=Cactaceae | |family=Cactaceae | ||
| + | |phenology=Flowering spring (Mar–May). | ||
|habitat=Chihuahuan Desert, sandy or gravelly flats, scrub with creosote bush, lower slopes, limestone or igneous substrates | |habitat=Chihuahuan Desert, sandy or gravelly flats, scrub with creosote bush, lower slopes, limestone or igneous substrates | ||
|elevation=600-1500 m | |elevation=600-1500 m | ||
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|publication year=1999 | |publication year=1999 | ||
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|subfamily=Cactaceae subfam. Opuntioideae | |subfamily=Cactaceae subfam. Opuntioideae | ||
|genus=Grusonia | |genus=Grusonia | ||
|species=Grusonia aggeria | |species=Grusonia aggeria | ||
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Latest revision as of 21:57, 5 November 2020
Shrubs, forming clumps, 3–9 cm. Roots tuberlike, 7–8 × 2.5–3 cm. Stem segments short cylindric to clavate, 3.5–9 × 1.5–3 cm; tubercles 8–18(–22) mm; areoles circular 3–4 mm in diam.; wool yellowish white. Spines (1–)5–15 per areole, mostly in distal areoles, 3–5 cm; major 1–3 abaxial spines deflexed, usually chalky white (at least adaxially), flattened to angular-flattened, longest central abaxial spine commonly twisted or curved (at times the only spine in depauperate specimens, those mostly from Big Bend region of Texas); major 0–5 adaxial spines divergent, ascending, brown to blackish and sometimes chalky, ± terete. Glochids adaxial in areole, yellow, to 4 mm. Flowers: inner tepals bright yellow, 25 mm; filaments green; style cream; stigma lobes pale yellow-green. Fruits yellow, aging gray, cylindric to ellipsoid, 20–25(–50) × 10–15 mm, becoming dry, spineless, glochidiate; areoles 25–35. Seeds yellowish to brownish, ± circular, to 5 mm in diam., with various numbers and sizes of bumps. 2n = 22.
Phenology: Flowering spring (Mar–May).
Habitat: Chihuahuan Desert, sandy or gravelly flats, scrub with creosote bush, lower slopes, limestone or igneous substrates
Elevation: 600-1500 m
Distribution
Tex., Mexico (Coahuila).
Discussion
Grusonia aggeria is based on the “type” of “Opuntia grahamii × O. schottii” described by M. S. Anthony (1956). It is not a hybrid, however, between the two tetraploid putative parental taxa; it is instead a fully fertile, diploid species.
Selected References
None.
Lower Taxa
None.