Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

MORFOLOGÍA DE LAS INFLORESCENCIAS EN VERBENACEAE-VERBENOIDEAE II: TRIBU PETREEAE

SUSANA I. DREWES and SUSANA MARTÍNEZ
Darwiniana
T. 37, No. 3/4 (1999), pp. 209-218
Stable URL: http://www.jstor.org/stable/23223905
Page Count: 10
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
MORFOLOGÍA DE LAS INFLORESCENCIAS EN VERBENACEAE-VERBENOIDEAE II: TRIBU PETREEAE
Preview not available

Abstract

This paper deals with the interpretation, description and typological characterization of the inflorescences of the following genera of the tribe Petreeae Briq.: Petrea L., Xolocotzia Miranda and Recordia Moldenke. All of them have a polytelic type of synflorescence. Florescences of all genera are racemes with decussate bracts. The heterothetic diplobotryum is present in Recordia and also in several species of Petrea. Truncation of the main florescence has been found in P. maynensis J. Huber, P. volubilis L. and P. pubescens Turcz. giving rise to an homothetic diplobotryum. Suppression of the enriching zone occurs in Xolocotzia, Recordia and some species of Petrea. Xolocotzia has monobotrya and reduction of flower number within the florescences. In the monobotrya the pair of leaves preceding the basal internode is bracteose and bears axillary resting buds. In the heterothetic diplobotryum this node represents an intercalar inhibition zone. Some Petrea species show aborted accesory paraclades. These arise from the accesory axillary buds of the enrichment zone. According to this study, the heterothetic pleiobotryum has been considered as a primitive or central form, from which monobotrya derived through processes of suppression of the enrichment zone, and homothetic pleiobotrya, by suppression of the main florescence (truncation). The use of inflorescence characters for a cladistic analysis accomplished by Rueda (1994) for the genus Petrea, are discussed. Se interpretan, describen y caracterizan tipológicamente las inflorescencias de los generos pertenecientes a la tribu Petreeae Briq.: Petrea L., Xolocotzia Miranda y Recordia Moldenke. En todos los casos las inflorescencias son del tipo politélico; las florescencias son racimos con brácteas decusadas. Se han encontrado diplobotrios hetéroteticos en Recordia, y en algunas especies de Petrea, diplobotrios homotéticos en P. maynensis J. Huber, P. volubilis L. y P. pubescens Turcz. y monobotrios en Xolocotzia, Recordia y algunas especies de Petrea. En los monobotrios el par de hojas que precede al entrenudo basal es bracteoso y porta yemas axilares en reposo, en los diplobotrios hetéroteticos este nudo, con iguales características, representa una zona de inhibicíon intercalar. Algunas especies de Petrea muestran paracladios accesorios abortados que tienen su origen en yemas axilares accesorias de la zona de enriquecimiento. En este estudio el pleiobotrio heterotético se considera una forma primitiva o central de la que derivan los monobotrios por supresión de la zona de enriquecimiento, y los pleiobotrios homotéticos por supresión de la florescencia principal (truncamiento). Se discute la interpretacíon y utilización de los caracteres de la inflorescencia, aplicados a un análisis cladístico del génera Petrea, realizado por Rueda (1994).

Page Thumbnails

  • Thumbnail: Page 
209
    209
  • Thumbnail: Page 
210
    210
  • Thumbnail: Page 
211
    211
  • Thumbnail: Page 
212
    212
  • Thumbnail: Page 
213
    213
  • Thumbnail: Page 
214
    214
  • Thumbnail: Page 
215
    215
  • Thumbnail: Page 
216
    216
  • Thumbnail: Page 
217
    217
  • Thumbnail: Page 
218
    218