View source for Cirsium engelmannii

{{Treatment/ID
|accepted_name=Cirsium engelmannii
|accepted_authority=Rydberg
|publications={{Treatment/Publication
|title=Fl. Rocky Mts.,
|place=1069. 1917
|year=1917
}}
|common_names=Blackland or Engelmann’s thistle
|basionyms={{Treatment/ID/Synonym
|name=Cirsium virginianum var. filipendulum
|authority=A. Gray
}}
|synonyms={{Treatment/ID/Synonym
|name=Cirsium terrae-nigrae
|authority=Shinners
}}
|hierarchy=Asteraceae;Asteraceae tribe Cardueae;Cirsium;Cirsium engelmannii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Cardueae]]</div><div class="higher-taxon"><small>genus</small>[[Cirsium]]</div><div class="higher-taxon"><small>species</small>[[Cirsium engelmannii]]</div></div>
|volume=Volume 19
|mention_page=page 99
|treatment_page=page 117
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Biennials </b>or monocarpic perennials, 40–200 cm; taproots and clusters of coarse fibrous roots that often have tuberlike thickenings. <b>Stems</b> single, erect, often branched above middle, thinly arachnoid-tomentose, ± glabrate; branches few, ascending. <b>Leaves</b>: blades elliptic or ovate, 5–20 × 1–10 cm, usually deeply pinnatifid, lobes narrowly to broadly triangular, sinuses broad, rounded (basal and distal cauline sometimes less divided, lobes linear-lanceolate), margins revolute, spreading, entire or spinulose to remotely few-toothed or sharply lobed, main spines slender, 1–5 mm, abaxial faces white-tomentose, adaxial green, villous with septate trichomes or glabrate; basal usually absent at flowering, winged-petiolate, bases tapered; principal cauline well distributed, gradually reduced, bases narrowed, sometimes weakly clasping; distal reduced, widely separated, distalmost bractlike. <b>Heads</b> 1–10+, borne at tips of main stem and branches. <b>Peduncles</b> 2–20+ cm, essentially naked with much reduced bracts. <b>Involucres</b> ovoid to broadly cylindric or campanulate, 2.5–3.5 × 2–3 cm, thinly arachnoid. <b>Phyllaries</b> in 10–12 series, strongly imbricate, greenish with subapical darker central zone, ovate (outer) to lanceolate (inner), abaxial faces with narrow glutinous ridge; outer and middle entire, bodies appressed, spines abruptly spreading to deflexed, slender, 2–4 mm; apices of inner phyllaries narrow, flexuous, flattened, entire or finely erose. <b>Corollas</b> pink to purple (white), 32–38 mm, tubes 15–20 mm, throats 6–9 mm, lobes 8–11 mm; style tips 5–6 mm. <b>Cypselae</b> brown, 5–6 mm, apical collars yellow, ca. 1 mm; pappi 25–30 mm. <b>2n</b> = 18 (as C. terrae-nigrae), 20 + 1B.</span><!--

-->{{Treatment/Body
|phenology=Flowering spring–summer (May–Jul).
|habitat=Tallgrass prairies, old fields, roadsides, oak savannas, forest edges, in calcareous clay or rarely sandy soils
|elevation=50–200 m
|distribution=La.;Okla.;Tex.
|discussion=<p>Cirsium engelmannii occurs mostly in the blackland prairies of eastern Texas. It ranges northward into southeastern Oklahoma and eastward to northwestern Arkansas.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Cirsium engelmannii
|author=
|authority=Rydberg
|rank=species
|parent rank=genus
|synonyms=Cirsium terrae-nigrae
|basionyms=Cirsium virginianum var. filipendulum
|family=Asteraceae
|phenology=Flowering spring–summer (May–Jul).
|habitat=Tallgrass prairies, old fields, roadsides, oak savannas, forest edges, in calcareous clay or rarely sandy soils
|elevation=50–200 m
|distribution=La.;Okla.;Tex.
|reference=None
|publication title=Fl. Rocky Mts.,
|publication year=1917
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V19-20-21/V19_69.xml
|tribe=Asteraceae tribe Cardueae
|genus=Cirsium
|species=Cirsium engelmannii
}}<!--

-->[[Category:Treatment]][[Category:Cirsium]]