Opuntia macrorhiza var. pottsii — Details

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Overview

Distribution

Localities documented in Tropicos sources

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Opuntia delicata Rose:
Mexico (Mesoamerica)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Localities documented in Tropicos sources

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Opuntia tenuispina Engelm. & J.M. Bigelow:
Mexico (Mesoamerica)

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Localities documented in Tropicos sources

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Opuntia pottsii Salm-Dyck:
Mexico (Mesoamerica)

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Localities documented in Tropicos sources

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Opuntia tenuiflora Small:
United States (North America)

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Localities documented in Tropicos sources

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Opuntia macrorhiza var. pottsii (Salm-Dyck) L.D. Benson:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Ariz., N.Mex., Tex.; Mexico (Chihuahua).
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National Distribution

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United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

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Shrubs, forming clumps, to 0.4 m, often from tuberlike rootstocks. Stem segments not easily detached, dark green, cuneate-obovate to commonly rhombic, 5-20 × 4-8 cm, fleshy but firm; areoles 4-6(-8) per diagonal row across midstem segment, oval to subcircular, 2-4 mm diam.; wool tan. Spines (0-)1-6 per areole, usually in distal 40% of stem segment, gray-white to red-brown, erect or reflexed, terete or proximal ones flattened, sometimes spirally twisted, longest to 60 mm, very slender, 0.2 mm diam. Glochids well developed in adaxial tuft , yellow or tan to brown-red, aging dull brown, to 6 mm. Flowers: inner tepals red throughout or with red basal portions, 25-35 mm; filaments pale yellow; anthers yellow; style whitish; stigma lobes cream to yellow. Fruits green to yellowish to dull red, long stipitate, elongate-obovoid, 25-40 × 15-40 mm, fleshy, base not narrowed, glabrous, spineless or nearly so; umbilicus deep; areoles 14-26. Seeds tan to gray, subcircular, 4-5 mm, thickish, warped; girdle protruding to 0.5 mm. 2n = 44.
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Diagnostic Description

Synonym

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Opuntia ballii Rose; O. delicata Rose; O. filipendula Engelmann; O. macrorhiza Engelmann var. pottsii (Salm-Dyck) L. D. Benson
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Type Information

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Holotype for Opuntia delicata Rose
Catalog Number: US 454621
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): J. N. Rose
Year Collected: 1908
Locality: Arizona, United States, North America
  • Holotype: Rose, J. N. 1911. Contr. U.S. Natl. Herb. 13: 310.
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Holotype for Opuntia delicata Rose
Catalog Number: US 454622
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): J. N. Rose
Year Collected: 1908
Locality: Arizona, United States, North America
  • Holotype: Rose, J. N. 1911. Contr. U.S. Natl. Herb. 13: 310.
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Holotype for Opuntia ballii Rose
Catalog Number: US 615400
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): C. R. Ball
Year Collected: 1909
Locality: Texas, United States, North America
  • Holotype: Rose, J. N. 1911. Contr. U.S. Natl. Herb. 13: 309.
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Ecology

Habitat

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Plains, hills, sandy or loamy soils; 900-1900m.
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Life History and Behavior

Cyclicity

Flowering/Fruiting

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Flowering late spring-early summer (May-Jul).
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Conservation

Conservation Status

National NatureServe Conservation Status

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United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

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Rounded Global Status Rank: T4 - Apparently Secure

Reasons: Found in western Texas, southern and eastern New Mexico, and southeastern Arizona in sandy or loamy plains or alluvial habitats at 1200 - 1800 m (Benson 1982).

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Notes

Comments

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Plants of Opuntia pottsii that are intermediate morphologically to O. macrorhiza are known in Arizona.
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