Cnicothamnus lorentzii (Asteraceae): foliar morphology, anatomy and architecture
Keywords:
Anatomy, Cnicothamnus, leaf, stomata, trichomesAbstract
Ruiz, Ana I.; María E. Guantay; María I. Mercado; Graciela I. Ponessa. 2014. “Cnicothamnus lorentzii (Asteraceae): foliar morphology, anatomy and architecture”. Lilloa 51 (2). Cnicothamnus lorentzii Griseb., is a native shrub distributed along the provinces of Tucumán, Salta and Jujuy and in the neighboring country of Bolivia. It is of medicinal interest, since its leaves and stems exhibit antilesmanial and trypanocidal activity. The aim of this work is to describe the morphology, anatomy and leaf architecture of C. lorentzii from Trancas, Tucuman, Argentina to identify characters of diagnostic value. Samples were processed using standards techniques for light and electron microscopy. Cnicothamnus lorentzii has simple leaves; the adaxial and abaxial sur faces are sub-glabrous and pubescent respectively. Glandular and eglandular trichomes were observed. Epidermal cells are polygonal with lobed anticlinal walls. In transverse section is dorsiventral, hypostomatic with con anomocytic, hemibrachy-paracytic, tetracytic and pentacytic. The midrib presents six collateral vascular bundles. The pubescent petiole shows 11 collateral vascular bundles arranged in a semicircle. Venation is pinnate camptodromous-eucamptodromous. Secondary veins straight. Areoles with and without freely ending veinlets. First described the anatomy and architecture and leaf petiole of C. lorentzii. The diagnostic value features are: leaf architecture, types of stomata and trichomes
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