#cephalium

• Arrojadoa — A genus of xerophytic plants within the Cactaceae family, endemic to the semi-arid regions of eastern Brazil, particularly inside the caatinga vegetation. It is characterized by slender, cylindrical, erect or decumbent, jointed stems that develop a woolly and bristly apical cephalium from which bright, tubular flowers emerge, adapted for hummingbird pollination.
• Arrojadoa penicillata — A particular cactus species within the Arrojadoa genus, endemic to the state of Bahia in Brazil. It is distinguished by slender, highly branched, and often shrubby stems whose segmented tips form a dense apical cephalium covered with fine, long hairs resembling a small brush (penicillate), from which vivid pink or purplish-red tubular flowers erupt.
• Arrojadoa rhodantha — A xerophytic species of cactus within the Arrojadoa genus, endemic to eastern Brazil (particularly in the states of Piauí, Ceará, Pernambuco, and Bahia), characterized by cylindrical, semi-erect or scrambling stems that develop a ringed apical cephalium covered with brownish or white wool and stiff reddish bristles. Its flowers are tubular, intense pink-magenta or bright red, adapted for hummingbird pollination within rocky caatinga habitats.
• Austrocephalocereus — A genus of succulent plants in the family Cactaceae, native to the arid and rocky regions of Eastern Brazil. These cacti are characterized by columnar, spiny stems and the development of a lateral cephalium (a dense zone of wool and bristles from which nocturnal flowers emerge).