Scilla scilloides; squill
A species of squill native to East Asia, often found in fields and grassy areas. The name refers to the plant itself, not a culinary or medicinal use unless specified.
In autumn, squill flowers bloom on the embankment.
Katakana spelling is standard for this plant name; usually written in kana.
Kanji form is rare and mainly used in botanical contexts; the word is usually written in kana.
The name つるぼ is of uncertain origin. The kanji 蔓穂 (vine + ear of grain) are likely ateji chosen for their sounds and visual association with the plant's appearance.