Chromosome Numbers of Some Species and Hybrids of Odontoglossum Orchid

Abstract

Chromosome numbers of six species and four hybrids of Odontoglossum (Odm.), four hybrids of Odontioda (Oda.), and one hybrid of Odontonia (Odtna.) were counted in root tip cells using the aceto-orcein squash method. The chromosome numbers (2n) are as follows: Odm. grande, 44; Odm. williamsianum, 44; Odm. bictoniense, 56; Odm. harryanum, 56; Odm. nobile, ca.84; Odm. crispum, ca.112; Odm. 'Rawdon Jester', 44; Odm. 'Augres', ca.88; Odm. 'Lemonade', ca.88; Odm. 'Nichirei Strotordo', 56; Oda. 'Picasso', 56; Oda. 'Nationhood', ca.112; Oda. 'Nichirei Sunrise', ca.112; Oda. 'Peter Timoney', ca.112; Odtna. 'Moliere', ca.88.