Difference between revisions of "Ratibida"

Rafinesque

Fl. Ludov., 73. 1817.

Common names: Prairie coneflower Mexican-hat
Etymology: Derivation unknown
Treatment appears in FNA Volume 21. Treatment on page 60. Mentioned on page 43.
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|discussion=<p>Species 7 (4 in flora).</p>
 
|discussion=<p>Species 7 (4 in flora).</p>
 
|tables=
 
|tables=
|references=
+
|references={{Treatment/Reference
 +
|id=jackson1963a
 +
|text=Jackson, S. W. 1963. Hybridization among three species of Ratibida. Univ. Kansas Sci. Bull. 44: 3–27.
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}}{{Treatment/Reference
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|id=richards1968a
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|text=Richards, E. L. 1968. A monograph of the genus Ratibida. Rhodora 70: 348–393.
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}}
 
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|family=Asteraceae
 
|family=Asteraceae
 
|distribution=North America;Mexico.
 
|distribution=North America;Mexico.
|reference=None
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|reference=jackson1963a;richards1968a
 
|publication title=Fl. Ludov.,
 
|publication title=Fl. Ludov.,
 
|publication year=1817
 
|publication year=1817
 
|special status=
 
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V21_134.xml
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|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_134.xml
 
|tribe=Asteraceae tribe Heliantheae
 
|tribe=Asteraceae tribe Heliantheae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Rudbeckiinae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Rudbeckiinae

Latest revision as of 20:09, 5 November 2020

Perennials, 15–120 cm. Stems 1–12+, erect, branched from bases, throughout, or only among heads, strigoso-hirsute, gland-dotted. Leaves basal and cauline; alternate; petiolate (petioles relatively shorter distally); blades lanceolate to ovate or oblanceolate to obovate or oblong, pinnately lobed to 1–2-pinnatifid (lobes usually rounded), ultimate margins entire or serrate, faces usually strigoso-hirsute, usually gland-dotted. Heads radiate, borne singly or in loose, corymbiform arrays. Involucres ± rotate, 8–16 mm diam. Phyllaries persistent, 5–15 in 2 series (usually reflexed in fruit, unequal, outer longer). Receptacles subspheric to columnar, paleate (paleae conduplicate, linear to oblong-oblique, chartaceous proximally, herbaceous distally, apices truncate, usually densely strigose and gland-dotted, each margin usually with an adaxial resin gland; receptacles plus paleae and florets = discs, 5–70 × 5–18 mm). Ray florets 3–15+, neuter; corollas yellow, bicolor (maroon/yellow), or wholly maroon. Disc florets 50–400+, bisexual, fertile; corollas yellowish green, often purplish distally, tubes shorter than cylindric throats, lobes 5, obovate to triangular (gland-dotted and, sometimes, hairy abaxially). Cypselae (black) strongly compressed, linear-oblanceolate to oblong-oblique, margins (at least abaxial) usually ciliate or pectinate-fimbriate, apices truncate and, often, ciliate, faces glabrous or sparsely hairy; pappi of 1–2 toothlike projections, or coroniform, or 0. x = 16.

Distribution

North America, Mexico.

Discussion

Species 7 (4 in flora).

Key

1 Plants taprooted; leaves 2-pinnately lobed; peduncles to 6.5 cm (ribs not prominent; heads held just beyond leaves); discs subspheric to ovoid, 5–15 mm; pappi coroniform (of connatescales 0.2–1.5 mm) Ratibida tagetes
1 Plants fibrous rooted or taprooted; leaves 1–2-pinnatifid or -pinnately lobed; peduncles (1.5–)6.5–48+ cm (ribs tan; heads held well beyond leaves); discs columnar, ellipsoid-globular, or ovoid, 10–70 mm; pappi 0, or of 1–2 toothlike projections > 2
2 Plants fibrous rooted; discs ellipsoid to globular or ovoid, 10–25 mm; pappi 0, or of 1–2 toothlike projections Ratibida pinnata
2 Plants taprooted; discs columnar, 10–70 mm; pappi usually of 1–2 toothlike projections, sometimes 0 > 3
3 Style branches ca. 1.8 mm, proximal 1/2 stigmatic, apices subulate; cypselae: abaxial margins narrowly winged to fimbriate or pectinate-fimbriate, adaxial margins pectinate-fimbriate Ratibida peduncularis
3 Style branches 1–2.5 mm, proximal 2/3–3/4 stigmatic, apices rounded; cypselae: abaxial margins glabrous, adaxial margins glabrous or ciliate Ratibida columnifera