What visual marker characterizes the white, star-shaped flowers of *Ornithogalum umbellatum* on their outer surface?
Answer
A distinct green stripe running down the center of each tepal
A key feature used for identifying *Ornithogalum umbellatum* is found on its characteristic white, star-shaped flowers. While the flower generally possesses six tepals (petals and sepals that are visually similar), the outer surface of each of these tepals displays a very specific marking: a distinct green stripe running longitudinally down the center. This feature, combined with the low-growing habit and early spring appearance, serves as a reliable visual cue for distinguishing this species from other innocuous or desirable wildflowers in a lawn or garden setting.
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