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Abstract Detail

Systematics Section

Mashayekhi, Saeideh [1], Columbus, J. [2].

Leaf anatomy of Allium (Alliaceae) subgenus Amerallium with a focus on the North American species.

The genus Allium(Alliaceae) is distributed over mid-latitude regions from the dry subtropics to the boreal zone. It includes ca. 850 species total, with 84 species in North America. The main center of diversity extends from the Mediterranean Basin to central Asia and Pakistan. A second center of diversity occurs in western North America. Thirteen subgenera are recognized. Subgenus Amerallium is divided into two clades: New World and Old World. Most of the New World species are in subgen. Amerallium and occur in California (ca. 50 species) and Texas(ca. 14 species). New World species have been placed into eight alliances based on morphological similarities. Characteristics of subgen. Amerallium include one-nerved tepals, one row of vascular bundles in the leaf, absence of leaf palisade parenchyma (if present,secondarily evolved from spongy mesophyll), and the presence of subepidermal leaf laticifers. Thus far we have sampled 70 New World and Old World species for transectional leaf anatomy. Permanent slides of sections from the middle of the blade were examined. The sections reveal a surprising amount of variation in both round and flat leaves in terms of arrangement of mesophyll cells and vascular bundles. A separate ongoing study involves the molecular phylogenetics of New World Allium. The anatomical variants of the leaves will be discussed in context of the phylogeny.

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1 - Rancho Santa Ana Botanic Garden, 1500 N. College Ave., Claremont, CA, 91711-3157, USA
2 - Rancho Santa Ana Botanic Garden, 1500 North College Avenue, Claremont, CA, 91711-3157, USA

subgenus Amerallium
leaf anatomy

Presentation Type: Poster:Posters for Sections
Session: P
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM
Number: PSY047
Abstract ID:584

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