Rock Garden Plants
Houstonia caerulea L.  
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FamilyRUBIACEAE
Genus speciesHoustonia caerulea L. 
SynonymsHedyotis caerulea (L.) Hook.
 Houstonia grandiflora Raf.
 Houstonia linnaei Michx.
Habitatgrassland
Descriptionleaves small, crowded, ovate, to base tapered, basal leaves spathulate, finely ciliate, bright green, flowers solitary, tetramerous
Size5-10cm
Colorpale blue
Bloomsummer
Ca-
Typesubshrub, cushion
Cultivationmesic, slightly humous, sunny site
alpine house, moist, rich, drained soil, sun
Propagationseed in spring, barely covered, germ. 1-3 months, 10-16°C
cuttings in late summer
Territory Northern America
     Eastern Canada (New Brunswick , Newfoundland , Nova Scotia , Québec )
     North-Central U.S.A. (Iowa , Missouri , Wisconsin )
     Northeastern U.S.A. (Connecticut , New Hampshire , New York , Vermont )
     Southeastern U.S.A. (Alabama , Arkansas , Louisiana , Maryland , Mississippi , Tennessee , Virginia)
BibliographyPlants of the World online powo.science.kew.org
International Plant Names Index www.ipni.org
Comments

RUBIACEAE

Houstonia caerulea L., Sp. Pl. 1: 105 (1753)

Synonyms:
Anotis caerulea (L.) G.Don
Hedyotis caerulea (L.) Hook.
Oldenlandia caerulea (L.) A.Gray

Synonyms:
Anotis gentianoides (Endl.) Walp.
Hedyotis brachiata Miq. ex Hook.f.
Hedyotis caerulea albiflora (Millsp.) Fosberg
Hedyotis caerulea benkei Fosberg
Hedyotis caerulea faxonorum (Pease & A.H.Moore) Fosberg
Hedyotis gentianoides Endl.
Houstonia caerulea albiflora Millsp.
Houstonia caerulea elatior (Michx.) Pursh
Houstonia caerulea faxonorum Pease & A.H.Moore
Houstonia caerulea piersii Barbour
Houstonia caerulea toxonorum Stevens
Houstonia faxonorum (Pease & A.H.Moore) Fernald
Houstonia grandiflora Raf.
Houstonia linnaei Michx.
Houstonia linnaei elatior Michx.
Houstonia pusilla J.F.Gmel.
Houstonia serpyllifolia Graham
Poiretia erecta J.F.Gmel.

e. Canada, nc. & e. USA
72 NBR NFL NSC QUE 74 IOW MSO WIS 75 CNT NWH NWY VER 78 ALA ARK LOU MRY MSI TEN VRG

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