Data from: Molecular and morphological evidence reveals a new species of Antiphytum (Echiochiloideae, Boraginaceae) from Guerrero, Mexico

Molecular and morphological evidence supports a new species in the genus
Antiphytum from the Sierra Madre del Sur, in the state of Guerrero,
Mexico, here described as A. brevicalyx. This species is unique in the
genus by possessing a calyx shorter than the corolla tube at anthesis; it
is similar to A. floribundum in inflorescence arrangement, but differs
from that species in lacking a basal leaf rosette and having appendages on
the corolla throat. According to phylogenetic analysis of nuclear ITS and
plastid ndhF-rpl32 sequences representing seven of the eight North
American species of the genus besides the proposed new species, accessions
of A. brevicalyx form a well-defined clade within Antiphytum,
corroborating its distinctive morphology. However, the analyses do not
resolve the phylogenetic position of A. brevicalyx within the genus.