Ratibida
Fl. Ludov., 73. 1817.
| Taxon | Illustrator ⠉ | |
|---|---|---|
 | Rudbeckia 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).
Selected References
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 |