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W. Sun and J. L. Brewbaker

The Leguminous Leucaena including 15 species, of which several have become pantropical as fodder, fuelwood, shade and ornamental trees. 160 collections of 12 Leucaena species, including 3 tetraploids and 9 diploids, were analyzed for six isozyme systems. Extensive inter and intraspecific variability was detected using cotyledon tissues. The uniformity of isozymic expression in 80 collections of the “common leucaena” from all over the world supported the hypothesis that it is a single self-pollinated variety. It was first distributed to the Philippines from Mexico in late 1500s, then spread worldwide. ACO polymorphism appeared to be controlled by three loci ACO1, ACO2, ACO3 and IDH by two loci IDH1, IDH2 in L. lanceolata. Peroxidase polymorphism was early shown to involve 4 loci, PX1-PX4. Polymorphism in these loci was applied to clarify phylogeny of the Leucaena ssp. and hybrids (>60 made in Hawaii), that are growing in the Waimanalo Sta. of UH.

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Ka Yeon Jeong, Paul V. Nelson, Carl E. Niedziela Jr. and David A. Dickey

respiratory acidification ( Marschner, 1995 ); acidic, neutral, or alkaline biotic effect of nutrient uptake ( Pertusatti and Prado, 2007 ), which varies among plant species ( Fisher et al., 2014a ; Johnson et al., 2013 ); and the abiotic effect of fertilizer

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Keenan Amundsen and Scott Warnke

The bentgrasses ( Agrostis spp.) are important species to the turfgrass industry because of their ability to form a dense, high-quality turf at low mowing heights. There are between 150 and 200 species of Agrostis ( Harvey, 2007 ), and the

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Panpan Meng, Ying Ge, Qianjin Cao, Jie Chang, Peng Pan, Chi Liu, Yijun Lu and Scott X. Chang

Lycoris Herb., also called ‘Magic lily’, ‘Surprise lily’, or ‘Spider lily’ ( Adams, 1976 ), is a genus of Amaryllidaceae that is native to East Asia. In many local Chinese dialects, Lycoris species have commonly been called “stone garlic

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Jinggui Fang, Jianjun Chen, Richard J. Henny and Chih-Cheng T. Chao

The genus Ficus , commonly referred to as fig, belongs to the family Moraceae and encompasses about 800 species ( Corner, 1965 ; Liberty Hyde Bailey Hortorum, 1976 ). Figs are woody trees, shrubs, climbers, or hemiepiphytic stranglers native to

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Christopher J. Currey and John E. Erwin

different chemicals and concentrations can vary among and within genera, species, and cultivars ( Seely, 1979 ). For example, Warner and Erwin (2003) and Nordwig (1999) reported variation among several hibiscus ( Hibiscus sp.) and milkweed species

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Wanploy Jinagool, Lia Lamacque, Marine Delmas, Sylvain Delzon, Hervé Cochard and Stéphane Herbette

; Zimmermann, 1983 ). Several studies have shown that xerophilous species have higher resistance to xylem cavitation than hygrophilous ones ( Choat et al., 2012 ; Larter et al., 2017 ; Maherali et al., 2004 ). Vulnerability to cavitation is thus considered as

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Lydia E. Wahba, Nor Hazlina, A. Fadelah and Wickneswari Ratnam

families from a horticultural point of view. Orchidaceae is one of the largest families among angiosperms. The family includes 800 genera and 25,000 species ( Stewart and Griffiths, 1995 ). Orchids are distributed in all regions of the world except

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Jacob G. Ricker, Jessica D. Lubell and Mark H. Brand

ornamental characteristics than is typical of straight species ( Wilde et al., 2015 ). Native shrubs produced from seeds are less marketable to a broad base of consumers because of variable quality ( Getz, 2015 ). Straight species of native shrubs are

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Jack B. Fisher, Anders Lindström and Thomas E. Marler

Contemporary cycads are derived from an ancient lineage of seed-bearing plants. All taxa are of considerable value to collectors because of their antiquity and unique features, and several species are represented in the nursery, landscape, and