PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES 
Series 4, Volume 64, No. 7, pp. 131-154, 11 figs. October 31, 2017 
New and Reconsidered Mexican Acanthaceae XII 
Thomas F. Daniel 
Department of Botany, California Academy of Sciences, 55 Music Concourse Drive, 
San Francisco, CA 94118 U.S.A. tdaniel@calacademy.org 
Six new species of Mexican Acanthaceae are described, illustrated, and mapped: 
Carlowrightia yucatanensis, Justicia zapoteca , Louteridium dendropilosum , L. rze- 
dowskianum , Poikilacanthus foliosepalus , and P. pochutlensis. Information on phe¬ 
nology, habitats, and preliminary conservation assessments are provided for each of 
these species. Two new combinations are proposed in Justicia , J. chrysostephana and 
J. durangensis, based on Cyrtanthera chrysostephana Hook.f. and Siphonoglossa 
durangensis Henr. & Hilsenb., respectively. Justicia lindenii Houllet and Justicia 
ardens T.F. Daniel are treated as new synonyms of J. chrysostephana. 
Keywords: Carlowrightia, Justicia, Louteridium, Poikilacanthus, pollen 
Se describen, ilustran y mapean seis especies nuevas de Acanthaceae mexicanas: 
Carlowrightia yucatanensis , Justicia zapoteca , Louteridium dendropilosum , L. rze- 
dowskianum , Poikilacanthus foliosepalus y P. pochutlensis. Se proporciona informa- 
cion sobre fenologia, habitats y evaluaciones preliminares de conservacion para cada 
una de estas especies. Se proponen dos combinaciones nuevas en Justicia , 
J. chrysostephana y J. durangensis , basadas en Cyrtanthera chrysostephana Hook.f. y 
Siphonoglossa durangensis Henr. & Hilsenb., respectivamente. Justicia lindenii Houl¬ 
let y Justicia ardens T.F. Daniel son tratados como sinonimos nuevos de 
J. chrysostephana. 
With about 400 species in 36 genera of Acanthaceae, Mexico appears to have the fourth-rich- 
est assemblage of that family among the world’s nations (exceeded only by India, Madagascar, and 
Brazil). Herewith, additional undescribed species as well as taxonomic and nomenclatural renova¬ 
tions are noted for the family in Mexico. Four of the six new species are from the southern Mexi¬ 
can state of Oaxaca, the richest state in the country for species of vascular plants, as well as for 
Acanthaceae (Daniel 2013). Preliminary conservation assessments based on IUCN (2017) guide¬ 
lines are provided for the species described here. 
New Species 
Carlowrightia yucatanensis T.F. Daniel, sp. nov. 
Carlowrightia yucatanensis differs from its congeners by the combination of being perennial 
herbs or shrubs to 1.5 m tall; having corollas entirely white, pseudopapilionaceous, and 8-12 mm 
long; having capsules pubescent with eglandular trichomes only; and having seeds with the mar¬ 
gin ± swollen and pectinate. 
Type.— MEXICO. Yucatan: Mpio. Panaba, ca. 10 km N of Panaba toward San Felipe, 
21°23.3'N, 088°14.9'W, 3 m elev., subdeciduous forest, 26-11-2003 (fir, frt), T. Daniel, 
G. Carnevali & J. Tapia 10320 (holotype: MEXU!; isotypes: CAS!, CICY!, COLO!, F!, K!, 
MICH!, MO!, NY!, RSA!, US!). 
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