Trichome morphology in Teucrium L. (Labiatae). A taxonomic review
Teresa Navarro,Jalal El Oualidi +1 more
TLDR
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 and supports Bentham's delimitauon of sections with the addiuons subequently made by Boissier.Abstract:
The micromorphology of trichomes of 56 Teucrium L. species belonging to the 9 sections of the genus in the Mediterranean area was surveyed by scanning electron 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 slighuy 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`Her. from sect. Teucrium . This last section is well defined by the absence of simple slighuy 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 slighuy 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 Cohen ex Valdes Berm. & Sanchez 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 delimitauon of sections with the addiuons subequently made by Boissier.read more
Citations
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Insight into the structure and chemistry of glandular trichomes of labiatae, with emphasis on subfamily lamioideae
Claudia Giuliani,Laura Bini +1 more
TL;DR: A new type of capitate trichome, exclusive of calices and corollas, which presents a mode and release of secretion never described before, is reported.
Journal ArticleDOI
Early evolution and ecology of camouflage in insects
Ricardo Pérez-de la Fuente,Xavier Delclòs,Enrique Peñalver,Mariela Speranza,Jacek Wierzchos,Carmen Ascaso,Michael S. Engel +6 more
TL;DR: An exceptional discovery of a green lacewing larva in Early Cretaceous amber from Spain with specialized cuticular processes forming a dorsal basket that carry a dense trash packet is reported, providing direct evidence of an early acquisition of a sophisticated behavioral suite in stasis for over 110 million years and an ancient plant–insect interaction.
Journal ArticleDOI
Anatomy, trichome morphology and palynology of Salvia chrysophylla Stapf (Lamiaceae)
TL;DR: The anatomy, palynology, morphology and distribution of the trichomes on the aerial parts of Salvia chrysophylla Stapf, an endemic species in Turkey, were studied in order to understand the usefulness of these characteristics for systematic purposes.
Journal ArticleDOI
Trichome micromorphology of Iranian Stachys (Lamiaceae) with emphasis on its systematic implication.
TL;DR: The data do not provide any support for separation of Sideritis from Stachys and trichome micromorphology is more useful in separation of species within sections rather than characterizing large natural groups known as sections.
Journal ArticleDOI
Trichome micromorphology of the East Asiatic genus Chelonopsis (Lamiaceae) and its systematic implications
TL;DR: Trichome micromorphology and distribution have high taxonomic value for Chelonopsis at both infrageneric and interspecific levels and supports Wu's delimitation of subgenus and sections and the subsequent review work by Xiang et al.
References
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Book
Secretory tissues in plants
TL;DR: This is a book that will show you even new to old thing, and when you are really dying of secretory tissues in plants, just pick this book; it will be right for you.
Journal ArticleDOI
Structure of glandular hairs and identification of the main components of their secreted material in some species of the labiatae
TL;DR: The anatomical structure of the secretory hairs of eight species of Labiatae was studied and the main components of their secretory substances identified.
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