Astrophytum asterias, the Silver Dollar Cactus, Sand Dollar Cactus, or Sea Urchin Cactus, is a unique, spineless cactus with a flat, dome-shaped body divided into 8 broad, triangular ribs. Its surface is covered in tiny, white, felted scales (trichomes) that give it a silvery, speckled appearance. It produces large, yellow flowers with orange throats from the center. This Texas and Mexico native is a prized, slow-growing collector's plant.
| Family: | Cactaceae (kak-TAY-see-ee) |
| Genus: | Astrophytum (ass-troh-FY-tum) |
| Species: | asterias (ass-TEER-ee-as) |
| Synonym: | Echinocactus asterias |
| Synonym: | Astrophytum asterias var. asterias |
Swamp Hibiscus (Hibiscus coccineus): Scarlet Rose Mallow, Texas Star
Golden Barrel Cactus (Echinocactus grusonii): Desert Globe of Gold
Starfish Cactus (Orbea variegata): Carrion Flower Succulent
Crenate Orchid Cactus (Epiphyllum crenatum): An Epiphytic Beauty with Fragrant Nocturnal Blooms
Mistletoe Cactus (Rhipsalis baccifera)
Silver Torch Cactus (Cleistocactus hyalacanthus): A Columnar Cactus with Silvery Spines
Road Kill Cactus (Consolea rubescens): A Spineless, Flattened Cactus with a Distinctive Habit
Miniature Barrel Cactus (Thelocactus setispinus): A Small, Floriferous Barrel with Bristly Spines
Old Lady Cactus (Mammillaria hahniana): A White-Haired Globe with a Crown of Pink Flowers
Texas Nipple Cactus (Mammillaria prolifera): A Tiny, Clumping Cactus with Yellow Flowers
Paper Spine Cactus (Tephrocactus articulatus var. papyracanthus): A Unique, Papery-Spined Cactus
Turk's Cap Cactus (Melocactus azureus): The Blue-Bodied Cactus with a Red Cephalium
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