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.
 TaxonIllustrator 
FNA21 P09 Rudbeckia missouriensi.jpegRudbeckia missouriensis
Ratibida pinnata
Zaluzania grayana
John Myers
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey

Perennials, 15–120 cm. Stems 1–12+, erect, branched from bases, throughout, or only among heads, strigoso-hirsute, glanddotted. 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 glanddotted. 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 glanddotted, 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 (glanddotted 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
... more about "Ratibida"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Lowell E. Urbatsch +  and Patricia B. Cox +
Rafinesque +
decurrent +
compound +  and simple +
lanceolate;ovate or oblanceolate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Prairie coneflower +  and Mexican-hat +
purplish +, yellowish green +, maroon +, bicolor +  and yellow +
hairy +  and glabrous +
linear-oblanceolate +  and oblong-oblique +
fertile +  and bisexual +
fertile +  and bisexual +
North America +  and Mexico +
Derivation unknown +
hairy +, glabrous +  and strigoso-hirsute +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
in loose , corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.8 cm8 mm <br />0.008 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
cauline +  and basal +
obovate +  and triangular +
dentate to pinnatifid or palmatifid +  and entire +
pectinate-fimbriate +  and ciliate +
2-carpellate +
persistent +
coroniform +
5 +  and 15 +
Fl. Ludov., +
bearing subulate enations +, hairy +  and bristly +
subspheric;columnar +
jackson1963a +  and richards1968a +
2 +  and 8 +
exalbuminous +
1 +  and 12 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Ratibida +
Asteraceae (tribe Heliantheae) subtribe Rudbeckiinae +
cylindric +
toothed +  and serrate +
15 cm150 mm <br />0.15 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
tree +, shrub +  and subshrub +