• NSF NEON | Open Data to Understand our Ecosystems
  • Biorepository Data Portal

  • Home
  • Search
    • Sample search
    • Map search
    • Dynamic Species List
    • Taxonomic Explorer
  • Images
    • Image Browser
    • Image Search
  • Datasets
    • Research Datasets and Special Collections
    • Checklist: Research Sites - Invertebrates
    • Checklist: Research Sites - Plants
    • Checklist: Research Sites - Vertebrates
  • Sample Use
    • Sample Use Policy
    • Sample Request
    • Sample Archival Request
    • Data Usage Policy
  • Additional Information
    • Tutorials and Help
    • About NEON
    • NEON Data Portal
    • ASU Biocollections
    • About Symbiota
  • Getting Started
Login New Account Sitemap
Quercus arkansana Sarg.  

No occurrences found

Family: Fagaceae
Arkansas oak
[Quercus caput-rivuli Ashe]
Images
not available
  • FNA
  • Resources
Kevin C. Nixon in Flora of North America (vol. 3)
Trees , deciduous, to 15 m. Bark black with long rough ridges separated by deep furrows. Twigs 1.5-3 mm diam., gray-pubescent, rarely glabrate. Terminal buds red-brown, ovoid, 2-5 mm, glabrous or with scales somewhat ciliate on margins, especially at apex. Leaves: petiole 5-25 mm, pubescent, rarely glabrate. Leaf blade rhombic to obovate or obtrullate, 50-150 × 35-100 mm, base acute to cordate, margins entire or with 2-3 shallow lobes and up to 10 awns, apex broadly obtuse to rounded; surfaces abaxially uniformly pubescent to glabrous except for conspicuous axillary tufts of tomentum, veins prominent, adaxially planar or somewhat rugose with a few persistent hairs near base. Acorns biennial; cup thin, shallow goblet- to almost saucer-shaped, 5-9 mm high × 10-16 mm wide, covering 1/4-1/2 nut, outer surface puberulent, inner surface sparsely to uniformly pubescent, scale tips appressed, acute; nut broadly ellipsoid to subglobose, 10-15 × 9-15 mm, puberulent, scar diam. 5-10 mm. Flowering spring. An understory tree of well-drained, sandy soils, on ravine heads (pocosins, steepheads); 50-150 m; Ala., Ark., Fla., Ga., La., Tex. Quercus arkansana reportedly hybridizes with Q . incana (= Q . × venulosa Ashe) and Q . nigra (D. M. Hunt 1986; W. H. Duncan and M. B. Duncan 1988). While agreeing that an isotype of the former clearly indicated a relationship to Q . arkansana , E. J. Palmer (1948) questioned the identity of the second parent and noted that venulosa is a homonym of a fossil species. In addition, D. M. Hunt (1989) cited evidence of hybridization with Q . hemisphaerica , Q . laevis , Q . marilandica , Q . myrtifolia , and either Q . falcata or Q . velutina .

Click to Display
0 Total Images
NSF NEON | Open Data to Understand our Ecosystems The National Ecological Observatory Network is a major facility fully funded by the National Science Foundation. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation.