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Streptanthus maculatus

Nutt.

Clasping Twistflower

G3Vulnerable Found in 2 roadless areas NatureServe Explorer →
G3VulnerableGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.145379
Element CodePDBRA2G0R0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderCapparales
FamilyBrassicaceae
GenusStreptanthus
Other Common Names
clasping jewelflower (EN) Clasping Jewelflower (EN)
Concept Reference
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Taxonomic Comments
The taxonomic validity of Streptanthus maculatus ssp. obtusifolius, and the typical subspecies are called into question by Flora North America vol. 7 authors who point out that the only distinctions between the two subspecies is the presence of a sepal callus in subspecies obtusifolius versus the absence of the callus in subspecies maculatus, and some subtle differences in leaf shape (2010). With that said, however, publications do exist that recognize subspecies obtusifolius as distinct, such as Zollner et al. (2005) who review the endemic flora of the Interior Highlands, USA.
Conservation Status
Rank MethodExpertise without calculation
Review Date1999-03-10
Change Date1998-02-01
Edition Date1999-03-10
Edition AuthorsCarr, Bill.
Threat ImpactUnknown
Range Extent20,000-2,500,000 square km (about 8000-1,000,000 square miles)
Number of Occurrences21 - 80
Rank Reasons
Streptanthus maculatus includes two subspecies, maculatus and obtusifolius that occur in Oklahoma, Texas, and Arkansas. Streptanthus maculatus var. obtusifolius is endemic to Ouachita Mountains of the Interior Highlands. However, the varieties are not recognized in some florisitic treatments. Threats are unknown.
Range Extent Comments
Streptanthus maculatus occurs in Arkansas, Oklahoma, and Texas. It is distributed in Arkansas in Garland, Hot Springs, Montgomery, Pike, Polk, Pulaski, and Saline counties; in Oklahoma in Latimer, Le Flore, McCurtain, and Pushmataha counties; and in Texas in Anderson, Cherokee, Gregg, Nacogdoches,Sabine, San Augustine and Smith counties (Correll & Johnston 1970, Orzell 1988, FNA 2010).
Occurrences Comments
Estimate of 21-100 occurrences would apply if Streptanthus maculatus.
Threat Impact Comments
Threats are unknown.
Ecology & Habitat

Habitat

In Texas, Streptanthus maculatus occurs primarily on seasonally moist barrens on the Weches Formation in Nacogdoches and San Augustine counties. However, there are recent reports from other sandy forested habitats in Anderson and Sabine counties (J. Singhurst, pers. comm.).
Other Nations (1)
United StatesN3
ProvinceRankNative
TexasS2Yes
OklahomaS2Yes
ArkansasSNRYes
Plant Characteristics
Economic Value (Genus)No
Roadless Areas (2)
Arkansas (2)
AreaForestAcres
Brush HeapOuachita National Forest4,205
Little BlakelyOuachita National Forest3,342
References (5)
  1. Flora of North America Editorial Committee (FNA). 2010. Flora of North America north of Mexico. Vol. 7. Magnoliophyta: Salicaceae to Brassicaceae. Oxford University Press, New York. xxii + 797 pp.
  2. Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
  3. Orzell, S.L. 1988. Letter to Dr. Charlie McDonald, USFWS, 28 Dec 1998. Files of the Texas Natural Heritage Program, Texas Parks and Wildlife Department, Austin.
  4. Smith, E.B. 1988b. An atlas and annotated list of the vascular plants of Arkansas. Second edition. Univ. Arkansas, Fayetteville. 489 pp.
  5. Zollner, D., M. H. MacRoberts, B. R. MacRoberts, and D. Ladd. 2005a. Endemic vascular plants of the Interior Highlands, U.S.A. Sida 21(3): 1781-1791.