Leaves in a dense tuft, acute, spinulose on the margin : infl. compound, in a cup of lvs., on a very short st. as in Nidularium, or on a longer exserted st.; fls. usually green, rarely golden or blue. — A genus of about 10 species, natives of Brazil. They are sometimes referred to Nidularium. | Leaves in a dense tuft, acute, spinulose on the margin : infl. compound, in a cup of lvs., on a very short st. as in Nidularium, or on a longer exserted st.; fls. usually green, rarely golden or blue. — A genus of about 10 species, natives of Brazil. They are sometimes referred to Nidularium. |