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Issue: Vol. 638 No. 2: 29 Feb. 2024
Type: Article
Published: 2024-02-29
DOI: 10.11646/phytotaxa.638.2.1
Page range: 105-130
Abstract views: 8
PDF downloaded: 0

Taxonomic study of Pan-Himalayan Cyperus species which used to be placed in the segregate genus Pycreus

State Key Laboratory of Plant Diversity and Specialty Crops, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China. China National Botanical Garden, Beijing, 100093, China. University of Chinese Academy of Sciences, Beijing, 100049, China.
State Key Laboratory of Plant Diversity and Specialty Crops, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China. China National Botanical Garden, Beijing, 100093, China. University of Chinese Academy of Sciences, Beijing, 100049, China.
University of Chinese Academy of Sciences, Beijing, 100049, China. Centre for Integrative Conservation & Yunnan Key Laboratory for the Conservation on Tropical Rainforests and Asian Elephants, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, 666303, China.
Nepal Academy of Science and Technology, Lalitpur, Nepal.
State Key Laboratory of Plant Diversity and Specialty Crops, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China. China National Botanical Garden, Beijing, 100093, China.
State Key Laboratory of Plant Diversity and Specialty Crops, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China. China National Botanical Garden, Beijing, 100093, China.
Cyperaceae Cyperus africanus lectotype Nepal Himalaya new combination synonym SEM typification weeds Monocots

Abstract

This paper presents a taxonomic account of the Cyperus species which used to be placed in the segregate genus Pycreus (hereafter: Pycreus species) within the Pan-Himalaya, based on morphological and micromorphological studies. Twelve Pycreus species have been identified in the Pan-Himalaya region. Taxonomic keys, descriptions, type information, ecology, and distribution notes are provided for each species. The taxonomic significance of nutlet micromorphology is discussed, supported by high-quality digital images and scanning electron microscope (SEM) observations. Cyperus diaphanus var. gracilescens and Pycreus pseudolatespicatus are synonymized with C. diaphanus. A new combination is proposed for P. lijiangensis, and lectotypes are designated for C. angulatus, C. diaphanus, C. substramineus, C. sulcinux, C. delavayi and P. lijiangensis. Additionally, C. africanus is reported for the first time outside Africa.

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