A mature Shaw’s agave rosette, its broad leaves edged with hooked marginal spines and tipped in dark terminal points. Photo: Krzysztof Ziarnek, Kenraiz, via Wikimedia
Parry’s nolina flower spikes crowded with tiny cream blossoms and the small bees that pollinate them. Photo: NPS / Alessandra Puig-Santana, via Wikimedia Commons (public
Engelmann’s hedgehog cactus in full spring bloom, its large pink flowers opening in sequence along the stem. Photo: National Nuclear Security Administration / Nevada Site
A golden cholla flower opens among the dense, straw-colored spines that give this cactus its common name. Photo: ZombiUwU, via Wikimedia Commons (CC BY-SA 4.0)
A cottontop cactus mound near Las Vegas, Nevada, its woolly crown wedged among curved gray spines. Photo: Stan Shebs, via Wikimedia Commons (CC BY-SA 3.0)
White bursage’s gray-green, deeply lobed leaves and small flower clusters on its characteristic tangle of wiry stems. Photo: Stan Shebs / Wikimedia Commons (CC BY-SA
Utah agave sending up its single flowering stalk above a rocky slope near Red Rock Canyon, Nevada. Photo: Stan Shebs / Wikimedia Commons (CC BY-SA
Indigo bush forms a dense, intricately branched gray-green shrub, here photographed leafless along a desert wash in southern California. Photo: Wikimedia Commons (CC BY-SA 2.0)
Desert senna in full spring bloom, growing among cholla cactus in Joshua Tree National Park, California. Photo: NPS / Alessandra Puig-Santana (public domain) Senna armata,
Desert broom at its fluffy, cotton-like seed stage in late fall, Molino Basin, Santa Catalina Mountains, Arizona. Photo: treegrow / Wikimedia Commons (CC BY 2.0)
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