⚠ Version 1 of The Plant List has been superseded.

You should refer instead to the current version of The Plant List.

The genus Houstonia is in the family Rubiaceae in the major group Angiosperms (Flowering plants).

Statistics are at the end of the page.

Species in Houstonia

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See "Status", "Confidence level", "Source" for definitions.

Name	Status	Confi­dence level	Source
Houstonia acerosa (A.Gray) Benth. & Hook.f.	Accepted		WCSP
Houstonia caerulea L.	Accepted		WCSP
Houstonia canadensis Willd. ex Roem. & Schult.	Accepted		WCSP
Houstonia correllii (W.H.Lewis) Terrell	Accepted		WCSP
Houstonia croftiae Britton & Rusby	Accepted		WCSP
Houstonia fasciculata A.Gray	Accepted		WCSP
Houstonia gracilis Brandegee	Accepted		WCSP
Houstonia greenei (A.Gray) Terrell	Accepted		WCSP
Houstonia humifusa (Engelm. ex A.Gray) A.Gray	Accepted		WCSP
Houstonia longifolia Gaertn.	Accepted		WCSP
Houstonia macvaughii (Terrell) ined.	Accepted		WCSP
Houstonia micrantha (Shinners) Terrell	Accepted		WCSP
Houstonia ouachitana (E.B.Sm.) Terrell	Accepted		WCSP
Houstonia palmeri A.Gray	Accepted		WCSP
Houstonia parviflora Holz. ex Greenm.	Accepted		WCSP
Houstonia procumbens (Walter ex J.F.Gmel.) Standl.	Accepted		WCSP
Houstonia prostrata Brandegee	Accepted		WCSP
Houstonia purpurea L.	Accepted		WCSP
Houstonia pusilla Schoepf	Accepted		WCSP
Houstonia rosea (Raf.) Terrell	Accepted		WCSP
Houstonia rubra Cav.	Accepted		WCSP
Houstonia serpyllifolia Michx.	Accepted		WCSP
Houstonia sharpii Terrell	Accepted		WCSP
Houstonia spellenbergii (G.L.Nesom & Vorobik) Terrell	Accepted		WCSP
Houstonia subviscosa (C.Wright ex A.Gray) A.Gray	Accepted		WCSP
Houstonia teretifolia Terrell	Accepted		WCSP
Houstonia terrellii (Lorence) Terrell & H.Rob.	Accepted		WCSP
Houstonia wrightii A.Gray	Accepted		WCSP

Statistics

The Plant List includes 104 scientific plant names of species rank for the genus Houstonia. Of these 28 are accepted species names.

The Plant List includes a further 49 scientific plant names of infraspecific rank for the genus Houstonia. We do not intend The Plant List to be complete for names of infraspecific rank. These are primarily included because names of species rank are synonyms of accepted infraspecific names.

Species names

The status of the 104 species names for the genus Houstonia recorded in The Plant List, are as follows:

	Status	Total
◕	Accepted	28	26.9%
◕	Synonym	70	67.3%
◕	Unplaced	4	3.8%
◕	Unassessed	2	1.9%

All names

The status of the 153 names (including infraspecific names) for the genus Houstonia recorded in The Plant List, are as follows:

	Status	Total
◕	Accepted	38	24.8%
◕	Synonym	109	71.2%
◕	Unplaced	4	2.6%
◕	Unassessed	2	1.3%

Of these names,

• 1 are recorded as invalid
• 6 are recorded as illegitimate

The confidence with which the status of the 104 species names recorded in The Plant List for the genus Houstonia, are assigned as follows:

	Confidence level	Accepted	Synonym	Unplaced	Unassessed	Total
	High confidence	28	67	0	0	95	91.3%
	Medium confidence	0	3	0	0	3	2.9%
	Low confidence	0	0	4	2	6	5.8%

The source of the species name record found in The Plant List for the genus Houstonia, are as follows: