Morfoanatomia das brácteas em Heliconia (Heliconiaceae) ocorrentes no Estado de São Paulo, Brasil

Abstract

RESUMO -(Morfoanatomia das brácteas em ). All species are found in São Paulo State. In the subg. Heliconia the bracts are cymbiform and in Stenochlamys they are lanceolate-conduplicated. All species have bracts with uniseriate epidermis, with thin-walled cells, tetracytical stomata in H. hirsuta and H. subulata, and polycytical in the others; the vascular bundles and air canals are distributed in arc-shaped and the fiber bundles are situated close to the abaxial surface. The bract shape, associated with the distribution of the fiber bundles and with the size of the air canals were different in both studied subgenera. An identification key was made based on morphological and anatomical features.

Importance of anatomical leaf features for characterization of three species of Mapania (Mapanioideae, Cyperaceae) from the Amazon Forest, Brazil

“…These air lacunae are formed by large, thinwalled, translucent cells. This character is similar to previous reports on Cyperaceae and Heliconiaceae (Govindarajalu 1968;Simão and Scatena 2004). This resemblance, together with the assumption of tissue continuity from the leaf sheath, pseudopetiole and leaf blade, strengthen our assumption that the translucent cells in the mesophyll of Mapania are indeed aerenchyma instead of aquiferous parenchyma, as erroneously indicated by Alves et al (2002) for M. pycnocephala, M. sylvatica and species of Hypolytrum.…”

“…The basal leaf sheath in M. macrophylla presents more vascular and more fiber bundles, both on various levels. A similar pattern was found in involucral bracts of Heliconia (Heliconiaceae, Simão & Scatena 2004). This feature occurs specially on basal leaves of M. macrophylla, in which they are long and robust (up to 1.2 m, based on Simpson 1992) and thus require a more complex supportive tissue.…”

Systematic consideration of petiole anatomy of species of Echinodorus Richard (Alismataceae) from north-eastern Brazil

“…This can be observed also in other groups of monocotyledons, such as Heliconia (Heliconiaceae), where characteristics such as the arrangement of fibre bundles in the abaxial region of the leaf, the size of the air canals in the mesophyll, and the form of the bracts provide important characteristics in determining the variation that exists among the subgenera (Sima˜o and Scatena, 2004).…”

Effects of the availability of floral resources and neighboring plants on nectar robbery in a specialized pollination system

“…In Brazil, H. spathocircinata (Heliconiaceae) is found in lowland Atlantic rainforest ( Berry and Kress 1991 ; Braga 2020 ) and blossoms in the wet season, between December and February ( Cruz et al 2006 ). This plant bears long-lasting inflorescences with cimbiform, brightly colored bracts varying from yellow to red, which are associated with ornithophily ( Berry and Kress 1991 ; Andersson 1998 ; Simão and Scatena 2004 ). Its plain and yellow flowers are inserted in the bracts, and visitors can only access the corolla legitimately through its opening at the apex of the flower.…”