small flower of a myrtillocactus geometrizans cactus

bilberry cactus bloom blooming blossom blue candle bud cactaceae cacti candelabra closeup creamy desert flora floral flower garden green mexico myrtillocactus geometrizans nature needles petal plant sharp shrubby spine spring succulent thorn thorny tree white whortleberry myrtle species genus native central northern aslobilberry popular cultivation young plants commonly remain unbranched years fruit edible sold consumption small