Taxonomical Identity of Rhizophora × annamalayana Kathir and Rhizophora × lamarckii Montrouz (Rhizophoraceae) in the Andaman and Nicobar Islands, India

Taiwania

卷:60

K. Ravichandran¹  P. Ragavan²  P.M. Mohan²  Alok Saxena³  R.S.C. Jayaraj⁴ 

[1] Department of Environment and Forests, Andaman and Nicobar Administration, Port Blair, Andaman and Nicobar Islands, India;

[2] Department of Ocean Studies and Marine Biology, Pondicherry University, Brookshabad Campus, Port Blair, Andaman& Nicobar Islands, India;

[3] Indira Gandhi National Forest Academy, Dehradun, Uttarakhand, India;

[4] Rain Forest Research Institute, Jorhat-785010, Assam, India;

关键词: Andaman and Nicobar Islands;    India;    Mangroves;    Rhizophora;    hybrids;    R. × annamalayana;    R. × lamarckii;   

DOI  :  10.6165/tai.2015.60.183

来源: DOAJ

【 摘 要 】

In India, Rhizophora hybrids have been recorded in Pichavaram (Tamil Nadu) and in the Andaman and Nicobar Islands (ANI). Rhizophora hybrids in Pichavaram mangrove forest were identified as Rhizophora × annamalayana, a cross between R. apiculata and R. mucronata, whereas Rhizophora hybrids in the ANI were identified as Rhizophora× lamarckii, a cross between R. apiculata and R. stylosa. However taxonomical distinction between them was not much explored. A recent floristic survey revealed the occurrence both R. × annamalayana and R. × lamarckii in the ANI, India. Based on critical analysis of specimens and morphometric analysis, it was found that both R. × lamarckii and R. × annamalayana can be distinguished from R. apiculata by their smooth green bract and bracteoles and 2-4 flowered inflorescences within the leaf axils. Rhizophora × annamalayana is distinguished from R. × lamarckii by its broader leaves (length: width ratio <1.8 vs >1.8), and shorter style (<1.5 mm vs. > 1.5 mm) and stamens in two whorls vs. usually in a single whorl. Rhizophora × annamalayana is the new record from the ANI. Higher relative density of R. × annamalayana than R. × lamarckii in the ANI is attributed to the abundance of its parental species (R. apiculata and R. mucronata) in the ANI

【 授权许可】

Unknown