Asagaho:朝顔(あさがほ):Bellflower

2009/08/30(Sun) updated.

"Asagaho:あさがほ" in Manyoshu is not the same flower as Japanese morning glory many Japanese people know. It is unspecified. It seems that Manyo-people called the flower blooms in the morning "Asagaho:あさがほ".
It is thought to be the one of the following flowers.

Chinese bellflower

"Kikyou:桔梗(ききょう)" in Japanese. It blooms bell shaped. It is native to East Asia.

Rose of Sharon(Hibiscus syriacus)

"Mukuge:槿(むくげ)" in Japanese.

Bindweed

"Hirugawo:昼顔(ひるがお)" in Japanese. It looks like a mourning glory and wilts in the evening.

1538: Hagi no hana, wobana kuzuhana, nadeshiko no hana, wominaheshi, mata fujibakama, asagaho no hana.
　　　　　　萩の花尾花葛花なでしこの花をみなへしまた藤袴朝顔の花

2104: Asagaho ha asatsuyu ohite, saku to ihedo, yufukage ni koso, saki masari keri.
　　　　　　朝顔は朝露負ひて咲くといへど夕影にこそ咲きまさりけり

2274: Koi marobi, kohi ha shinu tomo, ichi shiroku, iro niha ide ji, asagaho no hana.
　　　　　　臥いまろび恋ひは死ぬともいちしろく色には出でじ朝顔の花

2275: Koto ni idete, ihabayu yushimi, asagaho no, ho ni ha saki denu, kohi mo suru kamo.
　　　　　　言に出でて云はばゆゆしみ朝顔の穂には咲き出ぬ恋もするかも

3502: Waga mezuma, hito ha saku redo, asagaho no, toshi sahe kogoto, wa ha sakaru gahe.
　　　　　　我が目妻人は放くれど朝顔のとしさへこごと我は離るがへ