Difference between revisions of "Opuntia macrorhiza"
Boston J. Nat. Hist. 6: 206. 1850.
Common names: Western pricklypear
Synonyms: Opuntia compressa var. macrorhiza (Engelmann) L. D. BensonOpuntia mesacantha var. acrorhiza (Engelmann) J. M. Coulter
Treatment appears in FNA Volume 4. Mentioned on page 131.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Shrubs,</b> forming clumps, 7.5–16 cm, sometimes from tuberlike rootstocks. <b>Stem</b> segments not easily detached, dark dull green, often cross wrinkled when stressed, flattened, obovate to circular, 5–11 × 3.5–7.5 cm, fleshy (to flabby and cross wrinkled when stressed), tuberculate, glaucous; areoles 5–6(–8) per diagonal row across midstem segment, oval to subcircular, 2–4 mm diam.; wool tan. <b>Spines</b> (0–)1–4 per areole, usually in distal areoles, erect to spreading, white to red-brown, acicular, straight, terete or 1 flattened, ± stout (0.5 mm diam. at base), longest to 60 mm. <b>Glochids</b> in dense tuft, pale yellow, tan to red-brown, aging brown, to 5 mm. <b>Flowers</b>: inner tepals yellow with red basal portions, 25–40 mm; filaments pale yellow; anthers yellow; style white; stigma lobes cream to yellowish. <b>Fruits</b> green to yellowish to dull red, stipitate, elongate-obovoid, 25–40 × 15–28 mm, fleshy, glabrous; areoles 16–28. <b>Seeds</b> tan, subcircular, 4–5 mm, thickish, warped; girdle broad, protruding to 0.5 mm. <b>2n</b> = 44.</span><!-- |
-->{{Treatment/Body | -->{{Treatment/Body | ||
| + | |phenology=Flowering late spring (May–Jun). | ||
|habitat=Plains, chaparral, grassy woodlands, coniferous forests, sandy to loamy soils | |habitat=Plains, chaparral, grassy woodlands, coniferous forests, sandy to loamy soils | ||
|elevation=100-2300 m | |elevation=100-2300 m | ||
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|basionyms= | |basionyms= | ||
|family=Cactaceae | |family=Cactaceae | ||
| + | |phenology=Flowering late spring (May–Jun). | ||
|habitat=Plains, chaparral, grassy woodlands, coniferous forests, sandy to loamy soils | |habitat=Plains, chaparral, grassy woodlands, coniferous forests, sandy to loamy soils | ||
|elevation=100-2300 m | |elevation=100-2300 m | ||
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|publication year=1850 | |publication year=1850 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna- | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V4/V4_245.xml |
|subfamily=Cactaceae subfam. Opuntioideae | |subfamily=Cactaceae subfam. Opuntioideae | ||
|genus=Opuntia | |genus=Opuntia | ||
|species=Opuntia macrorhiza | |species=Opuntia macrorhiza | ||
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-->[[Category:Treatment]][[Category:Opuntia]] | -->[[Category:Treatment]][[Category:Opuntia]] | ||
Revision as of 14:01, 27 July 2019
Shrubs, forming clumps, 7.5–16 cm, sometimes from tuberlike rootstocks. Stem segments not easily detached, dark dull green, often cross wrinkled when stressed, flattened, obovate to circular, 5–11 × 3.5–7.5 cm, fleshy (to flabby and cross wrinkled when stressed), tuberculate, glaucous; areoles 5–6(–8) per diagonal row across midstem segment, oval to subcircular, 2–4 mm diam.; wool tan. Spines (0–)1–4 per areole, usually in distal areoles, erect to spreading, white to red-brown, acicular, straight, terete or 1 flattened, ± stout (0.5 mm diam. at base), longest to 60 mm. Glochids in dense tuft, pale yellow, tan to red-brown, aging brown, to 5 mm. Flowers: inner tepals yellow with red basal portions, 25–40 mm; filaments pale yellow; anthers yellow; style white; stigma lobes cream to yellowish. Fruits green to yellowish to dull red, stipitate, elongate-obovoid, 25–40 × 15–28 mm, fleshy, glabrous; areoles 16–28. Seeds tan, subcircular, 4–5 mm, thickish, warped; girdle broad, protruding to 0.5 mm. 2n = 44.
Phenology: Flowering late spring (May–Jun).
Habitat: Plains, chaparral, grassy woodlands, coniferous forests, sandy to loamy soils
Elevation: 100-2300 m
Distribution
Ariz., Ark., Colo., Kans., Mo., N.Mex., Okla., Tex., Utah, Mexico (Chihuahua).
Discussion
Opuntia macrorhiza hybridizes with the hexaploid O. engelmannii (apparently var. lindheimeri) forming the pentaploid O. ×edwardsii V. E. Grant & K. A. Grant. This hybrid is a small subshrub, 20–40 cm, with a mixture of widely spaced, unequal glochids and closely spaced, shorter glochids. Its major spines are gray, and its tepals are yellow or yellow with red bases. Those characteristics are similar to one parent or the intermediate of the two putative parents reported from Blanco and Guadalupe counties, central Texas.
Selected References
None.
Lower Taxa
None.