Floristic Composition, Life‐forms and Chorotypes of Al‐Asabah region, Ash Shamayatayn District, Taiz Governorate, Yemen

Abstract

The present study deals with the floristic composition of the flora, life forms and phytogeographical affinities in Al‐Asabah region, Ash Shamayatayn district, Taiz governorate, Yemen, during the year 2013. In this research 34 families, 63 genera and 82 taxa were identified. Among them were 6 species of Pteridophyta, while the remaining 76 taxa belong to Angiospermae. The dicots are represented by 72 taxa, whereas the monocots are represented by 4 species. The largest of the families include: Acanthaceae, Asclepiadaceae, Asteraceae and Euphorbiaceae (7 species for each) and Fabaceae (6 species). The genera represented by the greatest number of species are Acacia and Heliotropium (4 species for both). It was also noted that the generic index is 1.30. The chief life forms include Chamaephytes (50%), Phanerophytes (20.73%) and Geophytes (12.20%). The Sudano‐Zambezian element dominates and forms the major component of the floristic structure. Results also reveal that sixteen taxa (19.51%) are endemic, among them are five taxa (6.10%) which are endemic to Yemen alone, while the remaining (13.41%) are near endemic to the flora of Yemen.

Flora and Phytochorology of Lahij Governorate of Yemen: 1- Systematic Revision of Wild Legumes of the Family Fabaceae

“…4). These results are consistent with the previous studies in the flora of Yemen (Gabali & Al-Gifri, 1990;Ibrahim, 2006;Al-Hawshabi, 2017;Al-Hawshabi et al, 2017). This can be attributed to their efficient seed dispersal capabilities and wide ecological range of tolerance.…”

“…These results conform with those of Al-Hawshabi et al (2017). Moreover, Acacia (13 taxa), Indigofera (12 taxa), Tephrosia (7 taxa), Crotalaria, and Senna (6 taxa each), are the most species-rich genera (Fig.…”

“…Therophytes are short-lived plants characterized by their high growth rate which enables them to resist biotic influence, their ability to set numerous seeds, their genetic and morphological plasticity under a high level of disturbance, hot dry climate, lack of rainfall, and topographic variation (Barbero et al, 1990;Shaltout & Al-Sodany, 2008). This trend of lifeform spectra is similar to that of other regions of Yemen (Al-Hawshabi, 2017;Al-Hawshabi et al, 2017).…”

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“…The name of famous hill station Mussoorie is due to shrub Coriarianepalensis,which is very dominant species , stands in class E of frequency(81-100%) and the Presence of Constance is in class 5.The co-dominant species found in Mussoorie quadrats is BichhuButi(Utricadioca) and the interesting point to note is co-existence of Utricadioca with Polygonumcapitatum ,the natural medicine of the BichhuButi;a remarkable gift of nature to humanwelfare. A steady decrease in Quercus leucotrichophora (Banj) and Grewiapotiva ,a wonder tree and life line to locals attributed to complex interaction of looping, pests,chronic&environmental stress.The decline of both trees is of great concern to environmentalist due to its vital role in soil conservation and preventing landslide and has an adverse impact on under-storey shrubs(Coriarianepalense,Daphnepapyraceae, MahonianepalenseSarcococcasaligyne).The occurrence of Barberisapiculata in the region was an indicator of habitat degradation in the temperate region due to their thorny stem &unpalatable shoots [21].However, dominance of phanero-therophytes in Dehradun is expression of humid bio-climates [22].The floristic analysis of vegetation life form,reveals that 58% individual belongs tophanerophytes followed by therophytes(16%),Chamephytes(12%),hemicryptophytes (8%), and cryptophytes (6%) which infer humid/tropical arid climate in Dehradun [23]. The predominance of thero-phanerophytic unique to arid and semi-arid regions attributed to the dry climate,topographic variation, hence the life form is the manifestation of the adaptations of species to the climatic variations [24]; [25]…”

The Floristic Composition and Biological Spectrum of Chandigarh and Mussoorie Region

“…Raunkiaer (1934) proposed the term "Biological Spectrum ,an index of eco-restoration of forest & mirror reflection of the phytoclimate and floristic composition of the site. However,perusal of literature reveals that there has been more effort on the study of floristic composition ,life forms and biological spectrum in different times (Chauhan et al 2014, ,;Thakur,2015;Bhattacharjya and Sarma,2016;Ghildiyal et al,2016;Sahu and Barik,2017;Al-Hawshabi et al,2017). But no work is reported in the floristic study of different agro-climatic zones In the present study, all life forms play an important role in depicting the phytoclimate of dual extremes i.e.…”