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| Scientific Name | Grusonia aggeria (Opuntia aggeria) | USDA PLANTS Symbol | GRAG3 |
| Common Name | Clumped Dog Cholla, Jumping Dog Cholla | ITIS Taxonomic Serial No. | 907938 |
| Family | Cactaceae (Cactus) | SEINet Reference |
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| Description | Habitat: Desert environment; gravelly to silty soils in flats and slopes in Chihuahua Desert (Big Bend area) from 1800 to 3500 ft. Plant: Low, mat-forming cactus, less than 4 inches tall; more-or-less cylindrical stems, narrower at base; stems prostrate around edges and upright near the center; firm joints. Spines: Central spines (3 to 4) usually grayish-white, may be reddish-brown, 1-1/4 to 3-1/2 inches long, longer ones often twisted or curved; radial spines (2 to 4) grayish-white, 1/4 to 1 inch long, bent downwards. Inflorescence: Bright yellow flowers opening around noon for a single day; 1-1/2 to 2 inches wide and 2 to 2-3/4 inches long; yellow-orange to reddish filaments, yellow to cream anthers, cream-colored style and pale-green/yellow stigma lobes. Bloom Period: March to May. Fruit: Pale yellow, aging to gray, spineless, cylindric to ellipsoid, 3/4 to 1 inch long. References: "Little Big Bend" by Roy Morey, "Cacti of Texas" by Powell, Weedin and Powell and SEINet. |
BONAP Distribution Map |
Texas Status: Native |
| Scientific Name | Grusonia grahamii (Opuntia schottii var. grahamii) | USDA PLANTS Symbol | GRGR6 |
| Common Name | Graham's Dog Cholla | ITIS Taxonomic Serial No. | 907940 |
| Family | Cactaceae (Cactus) | SEINet Reference |
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| Description | Habitat: Desert environment; sandy, gravelly dunes, slopes and flats, 2300 to 5000 ft; Chihuahua Desert adjacent to Rio Grande. Plant: Low, mat-forming cactus, clumps 3 to 4-1/2 inches tall and 3 to 10 ft across; more-or-less cylindrical stems, about 5/8 to 1-3/8 inches in diameter, easily broken at joints. Spines: Central spines (4 to 7) smooth, straw-colored to brown, often pink- or red-tinged, 3/4 to 1-1/2 inches long, gray with age; radial spines (6 to 8) grayish-white, less than 1/2-inch long, bent downwards. Inflorescence: Bright yellow flowers opening early afternoon; 2 inches wide; green to yellow filaments and anthers, cream-colored style and pale yellow-green stigma lobes. Bloom Period: May to June. Fruit: Yellowish, spineless, cylindric to ellipsoid, 7/8 to 1-3/8 inches long. References: "Manual of the Vascular Plants of Texas" by Correll and Johnston, "Cacti of Texas" by Powell, Weedin and Powell and SEINet. |
BONAP Distribution Map |
Texas Status: Native |
