Trichome morphology inTeucriumL. (Labiatae). A taxonomic review

Anales del Jardín Botánico de Madrid

Jalal el Oualidi¹  Teresa Navarro² 

[1] Institut Scientifique, Département de Botanique et d'Ecologie Végétale, Université Mohammed V;Departamento de Biología Vegetal, Facultad de Ciencias, Universidad de Málaga

关键词: Labiatae;    Teucrium;    taxonomy;    microcharacters;    leaf;    calyx and corolla indumentum;    nutlet surface;   

DOI  :  

学科分类：植物学

来源: Jardin Botanico de Madrid. Anales

【 摘 要 】

The micromorphology of trichomes of 56Teucrium 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.PoliumsubsectPolium , except for the rare branched hair conical and thick-walled type found inTeucrium barbarumJahand. & Maire (sect.Chamaedrys ) andT. heterophyllumL`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.TeucriopsisBenth, is of particular interest for the exclusive presence of branched and peltate glandular hairs on the nutlets surface. Sect.Chamedrysis 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.IsotriodonBoiss, and sect.Poliumsubsect.RotundifoliaCohén 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.

【 授权许可】

Unknown