Overall color The color of the leaf petiole (hā) is highly variable, ranging from different shades of green, pink to red, and purple to black in color. For this feature, the main color of the central region of the petiole must be considered, and splotches or streaks of other color should be ignored.
Markings Often the petiole of taro varieties has distinct stripes, streaks and markings of a different color. This feature can help to identify the different varieties.
Waxy coating on the petiole? Rub the surface of the petiole. Does a white powder rub off to reveal the color underneath? This is a waxy coating. Most Hawaiian taro varieties do not have this waxy coating.
Apex color What is the color of the petiole in the region close to the junction with the leaf blade? Does it have a pink or red coloration?
Base (kumu hā ) color The color of the petiole an inch or more above the surface of the soil can be characteristic for taro varieties. The color can range from white-green, to pink-red, to brown-black. Ignore the color of the sheath margin.
Kōhina color The kōhina is the leaf scar, or the point of attachment of the oldest leaf, at the very top of the corm. Pull down and remove the oldest leaf of the taro plant to reveal the color of the kōhina which will be either white or pink-purple-red in color.
Margin (lihi māwae) color The margin (lihi māwae) is the edge of the petiole sheath. It can range in color from green or white, to pink, purple, or black.
Markings within petiole sheath The color of the veins within the petiole sheath can be distinctive in color. The inside of the sheath can be seen by removing the outer-most leaf from the plant.
Ratio: sheath length to total length Click here for more information on how to determine this value.