half. The leaves have a flattish or slightly convex ventral surface, and a convex dorsal surface, with the margins acute in the lower quarter of the plant but rounded towards the tip. Leaves are 3 to 10 cm long, 6 to 15 mm wide, and 3 to 6 mm thick. Peduncle is 10 to 30 cm tall, 3 to 8 mm thick. Bracts are deltate-lanceolate, acute, with the lowermost 1 to 3 cm long, 3 to 7 mm wide. The inflorescence is composed of typically 2 to 4 ascending branches, with each branch typically 3 to 10 cm long. 3 to 12 flowers are mounted on the pedicels, of which, the lowermost pedicels are 3 to 8 mm long. On the flower, the calyx is 4 to 5 mm wide, 4 to 6 mm high, segmenting into deltate-ovate to lanceolate sepals that are 3 to 5 mm long and 1.5 to 2 mm wide. Petals are white or cream, often with the keels lined in red, similar to D. a. subsp. attenuata. Petal shape is elliptic-oblong, acute, 8 to 10 mm long, 2 to 3.5 mm wide. The stamens are composed of filaments 5 to 6.5 mms long, with red or yellow anthers 1 to 1.5 mm long. The other presumptive parents of this recurrent hybrid are Dudleya brittonii and D. candida. × semiteres shares the chromosome count with its parents, having a chromosome number of n = 17. Phylogeny The taxonomic status of D. attenuata's subspecies is still under debate. Phylogenetic analysis reveals that although some specimens of D. attenuata from Punta Banda are sister to D. a. subsp. attenuata, other specimens collected are instead basal to D. edulis and D. formosa, illustrating the gene flow where the species overlap. Distribution and habitat D. attenuata is nearly endemic to Baja California with the exception of a population north of the border in San Diego County, California, at the Border Field State Park. It is also occurrent offshore on the Coronado Islands and the Isla Todos Santos. It can be found on coastal bluffs, typically below 165 ft. Conservation The D. attenuata population in the United States is threatened by Border Patrol activity and trampling. Gallery References attenuata Flora of California Flora of Baja California Natural history of San Diego County, California Natural history of the California chaparral and woodlands Taxa named by Reid Venable Moran