No. 3558. Stems. 34 Color Photomicrographs. 1. Zea mays, corn, typical monocot stem t.s. 2. Zea mays, t.s. vascular bundle 3. Juncus, bulrush, t.s. stem 4. Triticum, wheat, t.s. stem 5. Convallaria, t.s. concentric vascular bundle 6. Convallaria,