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Abstract
Genus Heliotropium L. (Heliotropiaceae) in south west of Saudi Arabia has been studied; seven species of H. arbainense Fresen, H. longiflorum (D.C.) Jauber & Spach, H. petrocarpum Hockst & Steud, H. strigosium Willd, H. zeylanicum Lam., H. jizanense Al-Turki and H. lasiocarpum Fisch were collected, recognized, typed and nomenclatured. The most valuable characters were those of macro and distinct micromorphological data such as stomata, hairs, pollen grains and stem anatomy. Light microscopy has been used in these studies. From the obtained results, trichomes and pollen grains data in addition to stem anatomy indicated good taxonomic tools to differentiate between species of this genus. Different traditional measurements were strikingly also helpful for the discrimination of species. H. longiflorum was characterized by distinctive data such as prominent anatomical information, P/E (1.8 μm) in addition to presence of spindle hair which in turn can be separated as a taxonomic level. Also, the results revealed a complete affinity between the two species of H. jizanense and H. lasiocarpum. An artificial key is provided for the differentiation between the studied species.
Highlights
Heliotropium L. related to Heliotropiaceae Schrad., which was included in Boraginaceae Juss
Leaf epidermal characters are useful in systematic phylogeny of several plant taxa and can be employed as useful taxonomic characters in segregating the major groups of plants [8]-[10]. [11] investigated leaf anatomy and distribution of foliar trichrome of four Heliotropium species which have been investigated in Saudi Arabia
Genus Heliotropium is characterized by its striking similarity on morphological characters, so this study aims to evaluate the systematic relationships of their similarity and dissimilarity compared to the modern findings of taxonomic relationships of species within the genus
Summary
Heliotropium L. related to Heliotropiaceae Schrad., which was included in Boraginaceae Juss. There are 10 species of genus Heliotropium distributed in Jazan of Saudi Arabia [5] [6]. Distribution and forms of trichomes are important qualities to be used to differentiate between the different genera and species of plant [7]. [11] investigated leaf anatomy and distribution of foliar trichrome of four Heliotropium species which have been investigated in Saudi Arabia. Genus Heliotropium is characterized by its striking similarity on morphological characters, so this study aims to evaluate the systematic relationships of their similarity and dissimilarity compared to the modern findings of taxonomic relationships of species within the genus
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