ANZA BORREGO, Calif. — A cactus in bloom is pure poetry — particularly that famous line by Walt Whitman: “Do I contradict myself? Very well, then I contradict myself.” In the desert here, the thick, spine-studded paddles of a beavertail cactus look as surly as always, ready to smack you into next week if you get within striking distance. Yet now, in a superbloom spring that many judge the best in
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