| Sumario: | In the treatment of the family Iridaceae for the "Flora Fanerogámica del Valle de México" the following taxa area recognized: Nemastylis tenuis (Herb.) Wats., Orthrosanthus chimboracensis var. exsertus Foster, Sisyrinchium angustissimum (Rob. & Greenm.) Greenm. & Thomps., S. arizonicum Rothr., S. cemuum (Bicknell) Kearney, S. convolutum Nocca, S. conzattii Calderón & Rzedowski, S. quadrangulatum Klatt, S. scabrum Schl. & Cham., S. schaffneri Wats., S. tenuifolium H. & B. ex Willd., S. tolucense Peyr., Tigridia alpestris Molseed ssp. alpestris, T. martinezii Calderón, T. multiflora (Baker) Ravenna, T. pavonia (L.f.) DC., T. vanhouttei ssp. roldanii Molseed, T. vanhouttei Roezl ssp. vanhouttei Schiede ex Schl. y Tritonia crocosmiiflora Nichols. Two taxa: Sisyrinchium conzattii and Tigridia martinezii were discovered as new species; S. arizonicum, S. cernuum, Tigridia multiflora, T. violacea and Tritonia crocosmiiflora are cited for the first time as members of the local flora; S. tolucense is applied to plants previously known from the area, but otherwise identified; Nemastylis caerulescens and Rigidella flammea are excluded, because no definite proofs were found of their existence in tle area.
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