Houstonia caerulea




Family Rubiaceae
Scientific name Houstonia caerulea L.
Synonyms Hedyotis caerulea (L.) Hooker; Houstonia caerulea L. var. faxonorum Pease & A. H. Moore
Common name (Japanese common name) hina-sou (ヒナソウ, 雛草 [meaning: tiny girls weed])
(English common name) azure bluet, bluets, Quaker-ladies
Distribution (Japan) Honshu, Kyushu
(Other nations) [native] Canada, USA
Habitat Field, roadside
Chromosomal number 2n=36
Description Plants electing 5-20cm tall. Leaves 3-12cm long (upper leaves 2-8 cm long). Flowers pale blue or white corollas 10-14mm across, flowering in March to June. Perennial plants.
Reference Houstonia caerulea L.
Houstonia caerulea L.
Houstonia caerulea L.
Novel plants (WIPO Patent WO/2006/133970)
Note Naturalized plants (introduced as a garden plant in 1884-1885)



April 2007
at Nikko Botanical Garden
April 2007
at Nikko Botanical Garden
April 2007
at Nikko Botanical Garden