General Research Observations
Occurrence ID (GUID): 134e8e7b-8dda-454a-9046-4efb185f8f8f
Taxon: Opuntia macrorhiza Engelm.
Family: Cactaceae
Collector: Tony Frates   627   
Date: 2014-11-11
Additional Collectors: Dorde Woodruff and Randy Blackburn
Locality: United States, Utah, Salt Lake, Moyle Park subdivision, 0.10 miles east of Old Orchard Lane at roughly 6100 South 2700 East in Holladay, Utah
40.640362  -111.815326 +-10m.  WGS84
Elevation: 1380 meters (4526ft)
Habitat: Full sun exposure with at the eastern end of a dry opening between arborescent Gambel's oak
Associated Species: Quercus gambelii, Ribes aureum, Elymus glaucus, Rhus trilobata, Ambrosia psilostachya, Achillea millefolium var. lanulosa, Erigeron divergens, Solidago velutina subsp. sparsiflora, Artemisia ludoviciana, Sporobolus cryptandrus, Helianthus annuus, Festuca saximontana var. saximontana, Linaria dalmatica, non-introgressed and introgressed Opuntia fragilis
Description: Obovate cladodes 14cm+ long and up 8.5 cm at widest point, lacking spines lower 1/3rd of pad, pads not easily detached, areoles mostly 2 cm apart, lateral central spines declined, erect to spreading distally, nor barbed. Receptacles/fruits narrow, elongated, typically at least 4 to 5 cm long, constricted at base, mostly spineless with rarely very short to short spines. Fruits growing solely on distal end of pad, from to 1 to 6+ per pad.
Reproductive Condition: Fruit
Notes: Growing two feet east of a hybrid O. fragilis x O. macrorhiza plant (see #626), near oak canopy and near more O. macrorhiza plants growing in partial shade. The hybrid plants (see #626) were in turn growing just to the east of clump forming non-introgressed O. fragilis which was in turn growing in front of area typical O. macrorhiza which continued to form larger stands to the west in the small enclosed natural spaces that is surrounded by private residences. The three different forms of cacti are growing here primarily in the northern portion of the opening along the edge of the Gambel's oaks with first an understory of Berberis repens, Ribes aureum and Elymus glaucus, and then in close proximity to Rhus trilobata.
Specimen Images
Author: Tony Frates
Author: Tony Frates
Author: Tony Frates
Record ID: 134e8e7b-8dda-454a-9046-4efb185f8f8f
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