Trichome morphology in Teucrium L. (Labiatae). A taxonomic review

Authors

  • Teresa Navarro Departamento de Biología Vegetal, Facultad de Ciencias, Universidad de Málaga
  • Jalal el Oualidi Institut Scientifique, Département de Botanique et d'Ecologie Végétale, Université Mohammed V

DOI:

https://doi.org/10.3989/ajbm.1999.v57.i2.203

Keywords:

Labiatae, Teucrium, taxonomy, microcharacters, leaf, calyx and corolla indumentum, nutlet surface

Abstract


The micromorphology of trichomes of 56 Teucrium L. species belonging to the 9 sections of the genus in the Mediterranean área was surveyed by scanning electrón microscopy (SEM) of leaves, calyx, corolla and nutlets. 25 trichome types are described, 12 of them are new. Thin walled hairs are the exclusive type found in the corolla and are the most widespread type on the abaxial side of the leaves. Subsessile glandular hairs, 2-4-celled, are found on the nutlet and leaves of the semi-shrubby and paleoendemic species. The presence of short or elongated, generally adpressed simple thick-walled slighüy conical hairs provides an additional character to clarify the boundaries between sect. Chamedrys (Mill.) Schreb, and sect. Polium (Mill.) Schreb. Branched non-glandular hairs are confined to sect. Polium subsect Polium, except for the rare branched hair conical and thick-walled type found in Teucrium barbarum Jahand. & Maire (sect. Chamaedrys) and T. heterophyllum L`Hér. from sect. Teucrium. This last section is well defined by the absence of simple slighüy conical thick-walled hairs and the glandular hairs in the corolla. Sect. Teucriopsis Benth, is of particular interest for the exclusive presence of branched and peltate glandular hairs on the nutlets surface. Sect. Chamedrys is a homogeneous group, distinguished from the other sections by an indumentum formed only by trichomes types evolved from the simple slighüy conical thick-walled hairs. This section overlaps, in the presence of glandular sub-sessile hair on the nutlets surface, with sects. Isotriodon Boiss, and sect. Polium subsect. Rotundifolia Cohén ex Valdés Berm. & Sánchez Crespo. The trichomes type of the calyx teeth, abaxial side of the leaf and latero-posterior corolla lobes can be used as a distinctive taxonomic character at specific and infra-specific level. This study supports Bentham's delimitaüon of sections with the addiüons subequently made by Boissier.

Downloads

Download data is not yet available.

Downloads

Published

1999-12-30

How to Cite

Navarro, T., & el Oualidi, J. (1999). Trichome morphology in Teucrium L. (Labiatae). A taxonomic review. Anales Del Jardín Botánico De Madrid, 57(2), 277–297. https://doi.org/10.3989/ajbm.1999.v57.i2.203

Issue

Section

Articles

Most read articles by the same author(s)

  • Carmen Rodríguez-Gallego, Teresa Navarro, Vegetative and reproductive phenological patterns in coastal dunes in S Spain , Anales del Jardín Botánico de Madrid: Vol. 72 No. 1 (2015)
  • Ana Rifón, Ángela Noguerol, Nieves Marcos, Patricia Navarro, Juan Ignacio Cubero, Leopoldo Medina, Santos Cirujano, José Gabriel Segarra, Nieves Redondo, Marina Horjales, Alfonso Blanco, Joao Domingues De Almeida, Jorge Baonza, Leopoldo Medina, Miguel Menezes de Sequeira, Carlos Aedo, José Luis Fernández Alonso, Roberto Roselló, Juan Bautista Peris, Gerardo Stübing, Pedro Sánchez Gómez, Teresa Navarro, Paloma Blanco, Adolfo Espejo Serna, Ana Rosa López Ferrari, Francisco Barreto Caldas, Joao José Honrado, Henrique Nepomuceno Alves, José Carlos Cristobal, Elena Camuñas, Manuel B. Crespo, Modesto Luceño, Marcio Lacerda Lopes Martins, Enrique Sánchez Gullón, Francisco María Vázquez, Vicenta de la Fuente, Emma Ortuñez, Jochen Muller, Alfredo Barra, Carlos Cortizo, Elvira Sahuquillo, Juanma Martino, Herminio S. Nava, M. Ángeles Fernández Casado, Joao Domingues de Almeida, Adriano Simoes da Silva, Consuelo Cebolla, José Ángel López Rodríguez, Juan José Lastra, Matias Mayor, Marco A. Mateos, Fernando Ojeda, Teodoro Marañón, Francisco Gómiz, Roberto Gamarra, Helena Silva, Pedro Santos, Jorge Paiva, Gines López González, Manuel Láinz, Notas Breves , Anales del Jardín Botánico de Madrid: Vol. 57 No. 1 (1999)