Petronymphe Moore (1951: 258)

Gutiérrez, Jorge, Terrazas, Teresa & Solano, Eloy, 2016, Petronymphe rara a new species of Oaxaca, Mexico and the rediscovery of P. decora (Asparagaceae: Brodiaeoideae), Phytotaxa 269 (2), pp. 113-119 : 116

Petronymphe Moore (1951: 258)

Type:— Petronymphe decora H.E. Moore.

Perennial herbs. Corms covered by the membranous leaf bases. Leaves 3‒6 disposed in a basal rosette, obtriangular or semiterete in transversal section, fistulous at the base, linear, equal to or longer than the inflorescence axis, margins with obtuse or acute prominences. Bracts 3‒4, membranous, bracteole one per flower. Inflorescence an umbel with 3‒25 flowers, pedicels articulated and geniculate at the flower joint. Flowers tubular, descendent and nodding, long pedunculated, with three depressions at the base, tube longer than the tepal lobes; tepals resupinate to descendent, 3-nerved. Stamens 6, filaments adnate to the tube and arising at its mouth, flared towards the base; anthers shorter or almost half the length of the free portion of filaments, dorsifixed introrse, longitudinally dehiscent. Gynophore radially adnate to perigone tube, developing three cavities. Ovary adnate ¼ of its length to the tube, trilocular; style filiform; stigma 3-lobed, papillose. Fruit an erect, loculicidal capsule. Seeds ca. 20, irregularly ellipsoid, laterally compressed, black, shiny, reticulated ( Fig. 2b, e ).

Figures

FIGURE 2. Some diagnostic traits of Petronymphe species.a–c. P.decora (J. Gutiérrez & R. Ríos 1350), a. Flower, b. Testa ornamentation. c. Leaf in transversal section. d–f. P. rara (J. Gutiérrez & R. Ríos 1410). d. Flower, e. Testa ornamentation, f. Leaf in transversal section. Scales: b, e: 200 μm; c, f: 300 μm.