View source for Penstemon arkansanus

{{Treatment/ID
|accepted_name=Penstemon arkansanus
|accepted_authority=Pennell
|publications={{Treatment/Publication
|title=Proc. Acad. Nat. Sci. Philadelphia
|place=73: 493. 1922
|year=1922
}}
|common_names=Arkansas beardtongue
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Penstemon multicaulis
|authority=Pennell
|rank=species
}} {{Treatment/ID/Synonym
|name=P. pallidus subsp. arkansanus
|authority=(Pennell) R. W. Bennett
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=P. wherryi
|authority=Pennell
|rank=species
}}
|hierarchy=Plantaginaceae;Penstemon;Penstemon subg. Penstemon;Penstemon sect. Penstemon;Penstemon arkansanus
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Plantaginaceae]]</div><div class="higher-taxon"><small>genus</small>[[Penstemon]]</div><div class="higher-taxon"><small>subgenus</small>[[Penstemon subg. Penstemon]]</div><div class="higher-taxon"><small>section</small>[[Penstemon sect. Penstemon]]</div><div class="higher-taxon"><small>species</small>[[Penstemon arkansanus]]</div></div>
|volume=Volume 17
|mention_page=page 185, 186, 215, 224
|treatment_page=page 193
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs.</b> Stems ascending to erect, (18–)25–45(–61) cm, retrorsely hairy, sometimes also ± glandular-pubescent distally, not glaucous. <b>Leaves</b> basal and cauline, basal often withering by anthesis, not leathery, glabrous or sparsely retrorsely hairy, especially along midvein and margins, abaxially, glabrous or sparsely puberulent adaxially; basal and proximal cauline 20–95 × 5–28 mm, blade spatulate or obovate to ovate, base tapered, margins subentire to ± serrate or dentate, apex rounded to obtuse or acute; cauline (6–)8–12 pairs, short-petiolate or sessile, 22–80 × 4–20 mm, blade lanceolate, base tapered to clasping, margins ± serrate or dentate, apex acute to acuminate. <b>Thyrses</b> interrupted, conic, 6–24 cm, axis retrorsely hairy and ± glandular-pubescent, verticillasters 4–8, cymes 3–13-flowered, 2 per node; proximal bracts lanceolate, 6–40 × 2–12 mm, margins entire or ± dentate; peduncles and pedicels ascending, retrorsely hairy and ± glandular-pubescent. <b>Flowers</b>: calyx lobes ovate, 2.8–4.5 × 1.1–2 mm, sparsely glandular-pubescent; corolla white, with reddish purple nectar guides, tubular to tubular-funnelform, 15–19 mm, glandular-pubescent externally, moderately whitish lanate internally abaxially, tube 4–6 mm, throat slightly inflated, 4–7 mm diam., 2-ridged abaxially; stamens included, pollen sacs opposite, navicular, 0.8–1 mm, dehiscing completely, connective splitting, sides glabrous, sutures papillate; staminode 10–12 mm, exserted, 0.2–0.4 mm diam., tip straight to slightly recurved, distal 5–7 mm ± villous, hairs yellow or golden yellow, to 1.2 mm; style 9–11 mm. <b>Capsules</b> 4–7 × 4–5 mm, glabrous. <b>2n</b> = 16.</span><!--

-->{{Treatment/Body
|phenology=Flowering Apr–Jun.
|habitat=Rocky oak-hickory woodlands, glades, rocky stream bottoms.
|elevation=60–300 m.
|distribution=Ark.;Mo.;Okla.
|discussion=<p><i>Penstemon arkansanus</i> is centered in the Interior Highlands. The species is most similar to <i>P. pallidus</i>, from which it differs by its narrower, less hairy, and more numerous cauline leaves. Some specimens from the narrow zone of sympatry in north-central Arkansas and south-central Missouri exhibit varying degrees of morphologic intermediacy. <i>Penstemon arkansanus</i> has been reported from Illinois (R. H. Mohlenbrock 1986) and Texas (S. D. Jones et al. 1997); those reports seem unlikely.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Penstemon arkansanus
|authority=Pennell
|rank=species
|parent rank=section
|synonyms=Penstemon multicaulis;P. pallidus subsp. arkansanus;P. wherryi
|basionyms=
|family=Plantaginaceae
|phenology=Flowering Apr–Jun.
|habitat=Rocky oak-hickory woodlands, glades, rocky stream bottoms.
|elevation=60–300 m.
|distribution=Ark.;Mo.;Okla.
|reference=None
|publication title=Proc. Acad. Nat. Sci. Philadelphia
|publication year=1922
|special status=Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V17/V17_463.xml
|genus=Penstemon
|subgenus=Penstemon subg. Penstemon
|section=Penstemon sect. Penstemon
|species=Penstemon arkansanus
}}<!--

-->[[Category:Treatment]][[Category:Penstemon sect. Penstemon]]