Anisotes (Acanthaceae) in Madagascar

摘要

Two species of Anisotes (Acanthaceae: Justicieae) are recognized from Madagascar. Anisotes madagascariensis is endemic to sandy, coastal regions of southern Madagascar. New morphological, distributional, and ecological data are presented for this species. A newly described species, A. divaricatus, is known only from calcareous, rocky substrates near Lake Tsimanampetsotsa in southwestern Madagascar. Major morphological distinctions between A. divaricatus and A. madagascariensis include: habit (divaricate branches vs. ascendant branches); length (5-11 vs. 14-45 mm long) and shape (obcordate to obdeltate vs. broadly ovate to elliptic) of leaf blades; corolla form (corolla tubetcorolla 0.46-0.56 vs. 0.23-0.38; lower lip not spirally coiled vs. spirally coiled); and capsule pubescence (lacking trichomes vs. tri-chomes present). Images of flowers and pollen, morphological descriptions, and mapped distributions are provided for both species.