Houstonia nigricans

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Distribution Map: Based on vouchered plant specimens only. View county names by placing the mouse cursor over a particular county.

Species Distribution Map
Family:RUBIACEAE
Species:Houstonia nigricans (Lam.) Fernald
Common Name:Diamond Flowers; Prairie Bluet; Narrowleaf Bluet
Habitat:**
Associated Ecological Communities:**
Growth Habit:Herb
Duration:Perennial
Category:Vascular
USDA Symbol:**
Plant Notes:Prairie Bluet is a native perennial in the Madder family (Rubiaceae). It is found primarily in the Black Belt region of Alabama. Prairie Bluet occurs in prairies, on cedar glades, marl outcrops, road bank cuts through limestone, and on shell mounds near the coast. It is a perennial from a taproot. Several stems are produced from each crown. Stems are up to two feet in length, with linear or filiform, opposite leaves. Stems are branched above the middle. The small flowers are produced in terminal cymes. The corolla is funnelform with four lobes. The corolla is white to lavender in color. The corolla is pubescent on the inner surface. The fruit is a capsule. Prairie Bluet has been placed in Houstonia, Hedyotis, and Stenaria by various authors. Molecular evidence suggests that perhaps it should again be placed in Houstonia.--A. Diamond
Taxonomic Notes:**
Status:Native
References:**
Specimen: View specimen details in the Alabama Herbarium Consortium Specimen Database

** Not applicable or data not available.

Classification

FamilyRUBIACEAE - Madder/Coffee family
Genus Houstonia
Species Houstonia nigricans (Lam.) Fernald - Diamond Flowers; Prairie Bluet; Narrowleaf Bluet

Citation

Citation Houstonia nigricans (Lamarck) Fernald, Rhodora 42(500): 299. 1940.
Basionym: Gentiana nigricans Lam. 1788.
Type: Without data (holotype: P).

** Not applicable or data not available.

Synonyms

SynonymFull CitationBasionymType
Chamisme angustifolia Chamisme angustifolia (Michaux) Nieuwland, Amer. Midl. Naturalist 4: 92. 1915.Houstonia angustifolia Michaux 1803. 
Gentiana nigricans Gentiana nigricans Lamarck, Encycl. 2: 645. 1788. Without data (holotype: P).
Hedyotis nigricans , var. papillacea Hedyotis nigricans (Lamarck) Fosberg, var. papillacea B. L. Turner, Phytologia 79: 15. 1995. NEW MEXICO: Otero Co.: Northern McKittrick Canyon at first crossing of Texas-New Mexico boundary, 8 Oct 1973, Patterson 508 (holotype: LL).
Hedyotis nigricans var. austrotexana Hedyotis nigricans (Lamarck) Fosberg, var. austrotexana B. L. Turner, Phytologia 79: 15. 1995. TEXAS: Karnes Co.: 2 mi. E of El Tejano Cafe, 22 Jun 1952, Johnson 833 (holotype: LL).
Hedyotis nigricans var. filifolia Hedyotis nigricans (Lamarck) Fosberg, var. filifolia (Chapman) Shinners, Field & Lab. 17: 168. 1949.Oldenlandia angustifolia (Michaux) A. Gray, var. filifolia Chapman 1860. 
Hedyotis nigricans var. pulvinata Hedyotis nigricans (Lamarck) Fosberg, var. pulvinata (Small) Fosberg, Castanea 19: 37. 1954.Houstonia pulvinata Small 1899. 
Hedyotis nigricans var. rigidiuscula Hedyotis nigricans (Lamarck) Fosberg, var. rigidiuscula (A. Gray) Shinners, Field & Lab. 17: 168. 1949.Houstonia angustifolia Michaux, var. rigidiuscula A. Gray 1884. 
Hedyotis nigricans var. scabra Hedyotis nigricans (Lamarck) Fosberg, var. scabra (S. Watson) Fosberg, Lloydia 4: 288. 1941.Houstonia angustifolia Michaux, var. scabra S. Watson 1893. 
Hedyotis salina Hedyotis salina (A. Heller) Shinners, Field & Lab. 17: 669. 1949.Houstonia salina A. Heller 1895. 
Hedyotis stenophylla Hedyotis stenophylla Torrey & A. Gray, Fl. N. Amer. 2: 41. 1841.Houstonia angustifolia Michaux 1803. 
Hedyotis nigricans Hedyotis nigricans (Lamarck) Fosberg, Lloydia 4: 298. 1941.Gentiana nigricans Lamarck 1788. 
Houstonia angustifolia var. filifolia Houstonia angustifolia Michaux, var. filifolia (Chapman) A. Gray, Syn. Fl. N. Amer. 1(2): 27. 1884.Oldenlandia angustifolia (Michaux) A. Gray, var. filifolia Chapman 1860. 
Houstonia angustifolia var. rigidiuscula Houstonia angustifolia Michaux, var. rigidiuscula A. Gray, Syn. Fl. N. Amer. 1(2): 27. 1884. FLORIDA
Houstonia angustifolia var. scabra Houstonia angustifolia Michaux, var. scabra S. Watson, Proc. Amer. Acad. Arts 18: 97. 1893. MEXICO: Coahuila: Caracol Mountains 21 mi. SE of Monclova, 19-22 Aug 1880, Palmer 410 (lectotype: GH; isolectotypes: LL, NY, PH, US, VT). Lectotypified by Terrell, Sida 19: 601. 2001.
Houstonia nigricans var. pulvinata Houstonia nigricans (Lamarck) Fernald, var. pulvinata (Small) Terrell, Sida 59: 79. 1985.Houstonia pulvinata Small 1899. 
Houstonia pulvinata Houstonia pulvinata Small, Bull. New York Bot. Gard. 1: 289. 1899. FLORIDA: St. Johns Co.: St. Augustine, Jul 1876, Reynolds s.n. (lectotype: NY; isolectotype: NA). Lectotypified by Terrell, Sida 11: 479. 1986.
Houstonia rigidiuscula Houstonia rigidiuscula (A. Gray) Wooton & Standley, Contr. U.S. Natl. Herb. 16: 175. 1913.Houstonia angustifolia Michaux, var. rigidiuscula A. Gray 1884. 
Houstonia rupestris Houstonia rupestris Rafinesque, Ann. Gén. Sci. Phys. 5: 226. 1820. KENTUCKY
Houstonia salina Houstonia salina A. Heller, Contr. Herb. Franklin Marshall Coll. 1: 96, pl. 9. 1895. TEXAS: Nueces Co.: Corpus Christi, 31 May 1894, Heller 1812 (lectotype: GH; isolectotypes: BM, ILL, K, MO, NY, PH, US 3 shts). Lectotypified by Terrell, Sida 11: 479. 1986.
Houstonia tenuis Houstonia tenuis Small, Fl. S.E. U.S. 1109, 1338. 1903. TEXAS: San Saba Co.: San Saba, Oct 1850, Thurber 67 (holotype: NY). + Expand All- Collapse
Houstonia angustifolia Houstonia angustifolia Michaux, Fl. Bor.-Amer. 1: 85. 1803. FLORIDA: Without data, Michaux s.n. (holotype: P).
Houstonia filifolia Houstonia filifolia (Chapman) Small, Fl. S.E. U.S. 1109. 1338. 1903.Oldenlandia angustifolia (Michaux) A. Gray, var. filifolia Chapman 1860. 
Oldenlandia angustifolia Oldenlandia angustifolia (Michaux) A. Gray, Pl. Wright. 2: 68. 1853.Houstonia angustifolia Michaux 1803. 
Oldenlandia angustifolia var. filifolia Oldenlandia angustifolia (Michaux) A. Gray, var. filifolia Chapman, Fl. South. U.S. 181. 1860. FLORIDA: Without data, Chapman s.n. (lectotype: US). Lectotypified by Terrell, Sida 11: 479. 1986.
Stenaria nigricans Stenaria nigricans (Lam.)Terrell, Sida 19: 600. 2001.Gentiana nigricans Lamarck 1788. 

Specimens and Distribution

This species has been reported in the following counties by the herbaria listed. An overview of the individual specimens are provided in the table that follows. Click on the accession number to view details; click on column headers to sort; choose a county or herbaria to filter the specimen data.

Counties included on distribution map: Autauga, Baldwin, Bibb, Bullock, Butler, Covington, Crenshaw, Dale, Dallas, Greene, Hale, Houston, Jefferson, Lawrence, Lowndes, Macon, Marengo, Montgomery, Pickens, Pike, Russell, Sumter

Counties represented by specimen data listed below:

Herbaria represented by specimen data listed below: ALNHS, AUA, JSU, TROY, UNA, USAM, UWAL

Range of years during which specimens were collected: 1965 - 2021

Barcode / Accession No. County Coll. Date Collector &
Collection No.		 Herbarium &
Herbarium Name Used		 Image
AUA_ACC_35261 Montgomery 2 Jul 1979 Crawford, Lloyd C.
 AUA
Stenaria Nigricans (Lam.) Terrell
TROY000008694 Lowndes 09 Sep 2004 Hansen, Curtis J.
1631		 TROY
Stenaria nigricans (Lamarck) Terrell
AUA_ACC_34141 Dallas 3 Jun 1977 Sessler, Ann H.
1501		 AUA
Stenaria Nigricans (Lam.) Terrell
TROY000035299 Macon 22 Jun 2012 Diamond, Alvin R.
23122		 TROY
Stenaria nigricans (Lamarck) Terrell
AUA_ACC_23282 Russell 12 Aug 1971 Strait, Danny Bob
175		 AUA
Stenaria Nigricans (Lam.) Terrell
TROY000033032 Montgomery 03 Jul 2011 Diamond, Alvin R.
22314		 TROY
Stenaria nigricans (Lamarck) Terrell
UWAL0010747 Macon 17 Jun 2012 Diamond, Alvin R.
23089		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
TROY000008693 Dallas 29 Jun 2003 Spaulding, Daniel D.
11953		 TROY
Stenaria nigricans (Lamarck) Terrell
UNA00043719 Hale 17 Jul 1965 Maginness, Sherrie E.
50		 UNA
Houstonia nigricans (Lam.) Fern.
JSU132457 Bibb 5 Sep 1970 Kral, Robert
41083		 JSU
Houstonia nigricans (Lamarck) Fernald
UWAL0052769 Lowndes 19 Jun 2002 Sorrie, B.A.
10897		 UWAL
Stenaria nigricans (Larmarck) Terrell var. nigricans
AUA_ACC_40474 Bibb 5 Sep 1970 Kral, Robert
41083		 AUA
Stenaria Nigricans (Lam.) Terrell
UNA00058182 Sumter 01 Jul 2002 Keener, Brian R.
2226		 UNA
Hedyotis nigricans (Lam.) Fosberg var. nigricans
TROY000034906 Macon 17 Jun 2012 Diamond, Alvin R.
23089		 TROY
Stenaria nigricans (Lamarck) Terrell
UNA00069240 Marengo 08 Aug 2008 England, J. Kevin
874		 UNA
Stenaria nigricans Terrell var. nigricans
UWAL0003967 Sumter 10 Jul 1995 Cooper, Jennifer
B-093		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
TROY000023300 Butler 06 Sep 2007 Diamond, Alvin R.
18040		 TROY
Stenaria nigricans (Lamarck) Terrell
TROY000046564 Autauga 08 Jun 2017 Parker, Matthew R.
910		 TROY
Houstonia nigricans (Lamarck) Fernald
UNA00060378 Crenshaw 07 Jul 2002 Diamond, Alvin R.
13446		 UNA
Hedyotis nigricans (Lam.) Fosberg
UNA00057762 Bibb 04 Jul 1992 Allison, James R.
6798		 UNA
Hedyotis nigricans (Lam.) Fosberg
AUA_ACC_57552 Dallas 7 Jun 1973 Kral, Robert
50452		 AUA
Stenaria Nigricans (Lam.) Terrell
UNA00066930 Sumter 10 Jul 2006 Keener, Brian R.
3204		 UNA
Hedyotis nigricans (Lam.) Fosberg
USAM000013998 Sumter 27 Jun 1970 Kral, Robert
39769		 USAM
Hedyotis nigricans (Lamarck) Fosberg
TROY000008793 Bullock 28 Aug 2005 Diamond, Alvin R.
15703		 TROY
Stenaria nigricans (Lamarck) Terrell
ALNHS00004687 Dallas 19 May 2016 Barger, T. Wayne
SP#2797		 ALNHS
Houstonia nigricans (Lam.) Fern. var. nigricans
UWAL0003966 Sumter 10 Jul 2006 Keener, Brian R.
3204		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
TROY000008692 Crenshaw 07 Jul 2002 Diamond, Alvin R.
13446		 TROY
Stenaria nigricans (Lamarck) Terrell
UWAL0030401 Bibb 09 Aug 1992 Kral, Robert
81278		 UWAL
Houstonia nigricans (Lam.) Fern.
UWAL0002995 Lowndes 12 Jul 2009 Keener, Brian R.
5520		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
TROY000033776 Marengo 08 Oct 2010 England, J. Kevin
2611		 TROY
Stenaria nigricans (Lamarck) Terrell
UWAL0003964 Lowndes 23 Jun 2007 Keener, Brian R.
3706		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
UWAL0018492 Houston 26 Jun 1991 Kral, Robert
79168		 UWAL
Houstonia nigricans (Lam.) Fern.
UWAL0016420 Pike 07 Jul 2014 Diamond, Alvin R.
25293		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
UNA00022444 Marengo 13 Aug 1969 Thomas, Joab L.
2416		 UNA
Houstonia nigricans (Lam.) Fern.
JSU132458 Jefferson 14 Sep 1985 Barber, J. Patrick
1772		 JSU
Houstonia nigricans (Lamarck) Fernald
TROY000042631 Covington 11 Jul 2015 Diamond, Alvin R.
26592		 TROY
Stenaria nigricans (Lamarck) Terrell
AUA_ACC_51043 Pike 29 Jul 1990 Diamond, Alvin R.
7055		 AUA
Stenaria Nigricans (Lam.) Terrell
UNA00043723 Marengo 18 Jun 1969 Thomas, Joab L.
2243		 UNA
Houstonia nigricans (Lam.) Fern.
AUA_ACC_63436 Dallas 29 Jun 2003 Spaulding, Daniel D.
11953		 AUA
Stenaria Nigricans (Lam.) Terrell
UNA00062272 Dallas 29 Jun 2003 Spaulding, Daniel D.
11953		 UNA
Hedyotis nigricans (Lam.) Fosberg
AUA_ACC_14148 Montgomery 21 Jun 1967 Rankin, H.Taylor
 AUA
Stenaria Nigricans (Lam.) Terrell
TROY000023469 Sumter 24 Aug 2003 Spaulding, Daniel D.
12046		 TROY
Stenaria nigricans (Lamarck) Terrell var. nigricans
TROY000023471 Sumter 10 Jul 2006 Keener, Brian R.
3204		 TROY
Stenaria nigricans (Lamarck) Terrell
UWAL0030673 Covington 11 Jul 2015 Diamond, Alvin R.
26592		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
TROY000037683 Bullock 07 Jun 2012 Dykes, Bailee
835		 TROY
Stenaria nigricans (Lamarck) Terrell
UWAL0031878 Dale 16 Aug 1987 Kral, Robert
74351		 UWAL
Houstonia nigricans (Lamarck) Fernald
UWAL0003963 Dallas 23 Jun 2007 Keener, Brian R.
3724		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
UWAL0003962 Butler 06 Sep 2007 Diamond, Alvin R.
18040		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
UWAL0056465 Lawrence 08 Jul 2021 England, Kevin J.
13832		 UWAL
Houstonia nigricans (Lamarck) Fernald
UWAL0046949 Autauga 08 Jun 2017 Parker, Matthew R.
910		 UWAL
Houstonia nigricans (Lamarck) Fernald
USAM000013999 Greene 08 Jun 1979 LeLong, Michel G.
10864		 USAM
Hedyotis nigricans (Lamarck) Fosberg
UNA00043720 Montgomery 23 Jul 1969 Thomas, Joab L.
2315		 UNA
Houstonia nigricans (Lam.) Fern.
JSU139917 Bibb 01 Sep 1996 Spaulding, Daniel D.
9107		 JSU
Houstonia nigricans (Lamarck) Fernald
UWAL0015004 Bullock 07 Jun 2012 Dykes, Bailee
835		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
TROY000023468 Bibb 14 Aug 2000 Kral, Robert
90105		 TROY
Stenaria nigricans (Lamarck) Terrell
UWAL0002680 Marengo 08 Oct 2010 England, J. Kevin
2611		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
TROY000023302 Marengo 08 Aug 2008 England, J. Kevin
874		 TROY
Stenaria nigricans (Lamarck) Terrell var. nigricans
AUA_ACC_11561 Montgomery 15 Jul 1967 Teem, David H.
57		 AUA
Stenaria Nigricans (Lam.) Terrell
TROY000023470 Sumter 01 Jul 2002 Keener, Brian R.
2226		 TROY
Stenaria nigricans (Lamarck) Terrell var. nigricans
UWAL0011285 Macon 22 Jun 2012 Diamond, Alvin R.
23122		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
UNA00053597 Greene 05 Aug 1969 Thomas, Joab L.
2376		 UNA
Hedyotis nigricans (Lam.) Fosberg
UWAL0003965 Pickens 30 Jun 2007 Keener, Brian R.
3744		 UWAL
Houstonia nigricans (Lamarck) Fernald var. nigricans
UNA00043722 Sumter 27 Jun 1970 Kral, Robert
39769		 UNA
Houstonia nigricans (Lam.) Fern.
UNA00043718 Dallas 18 Jun 1969 Thomas, Joab L.
2215		 UNA
Houstonia nigricans (Lam.) Fern.
AUA_ACC_63939 Sumter 24 Aug 2003 Spaulding, Daniel D.
12046		 AUA
Stenaria Nigricans (Lam.) Terrell
UNA00063047 Sumter 24 Aug 2003 Spaulding, Daniel D.
12046		 UNA
Houstonia nigricans (Lam.) Fern.
AUA_ACC_30912 Macon 29 Jun 1973 Owen, J.T.
055		 AUA
Stenaria Nigricans (Lam.) Terrell
TROY000023301 Lowndes 23 Jun 2007 Keener, Brian R.
3706		 TROY
Stenaria nigricans (Lamarck) Terrell var. nigricans
ALNHS00001356 Dallas 20 Oct 2010 Barger, T. Wayne
OC-568		 ALNHS
Houstonia nigricans (Lam.) Fern.
UNA00043721 Baldwin _ Jun 1879 Mohr, Charles
s.n.		 UNA
Houstonia nigricans (Lam.) Fern.
AUA_ACC_64416 Lowndes 9 Sep 2004 Hansen, Curtis J.
1631		 AUA
Stenaria Nigricans (Lam.) Terrell
TROY000039695 Pike 07 Jul 2014 Diamond, Alvin R.
25293		 TROY
Stenaria nigricans (Lamarck) Terrell
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