Skip to main content

Advertisement

Table 2 Dichotomous key to seven species in Alpinia , Amomum, and Elettaria genera based on anatomical characteristics of seeds

From: Identification of seven Zingiberaceous species based on comparative anatomy of microscopic characteristics of seeds

1. Fruit a capsule, axile placentation, seeds with arils and numerous seeds attached to the central axis of an ovary with three locules  
2a. Hypodermis of testa comprising one layer of cells with pigment  
3a. Inner side of oil cell layer with several layers of pigmented cells  
4a. Pigmented cell wall not distinct  
5a. Ratio of thickness of lumina to endotesta palisade sclerenchymatous  
cells 1:5–1:4 1. Amomum kravanh
5b. Ratio of thickness of lumina to endotesta palisade sclerenchymatous  
cells 1:10–1:20 2. Amomum subulatum
4b. Pigmented cell wall distinct and shrunken 3. Amomum tsao-ko
3b. Inner side of oil cell layer with one layer of obliterated cells 4. Elettaria cardamomum
2b. Hypodermis of testa comprising one or more layers of cells without pigment, several layers of pigment cells scattered with oil cells  
6a. Ratio of thickness of lumina to endotesta palisade sclerenchymatous  
cells approx. 1:2  
7a. Oil cells in 1–3 layers 5. Alpinia katsumadai
7b. Oil cells in 1–2 layers 6. Alpinia zerumbet
6b. Ratio of thickness of lumina to endotesta palisade sclerenchymatous  
cells 1:5–1:4 7. Alpinia galanga