Rigiopappus

A. Gray

Proc. Amer. Acad. Arts 6: 548. 1865.

Etymology: Latin rigeo, rigid, and pappus alluding to stiff pappus scales
Treatment appears in FNA Volume 20. Treatment on page 48. Mentioned on page 3, 9, 46.
 TaxonIllustrator 
FNA20 P05 Rigiopapus leptocladus.jpegRigiopappus leptocladus
Tracyina rostrata
Ericameria cuneata var. cuneata
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey
John Myers

Annuals, 5–30+ cm (taprooted). Stems usually erect, simple or branched (laterals often overtopping main-stems), pilosulous to hirtellous, glabrate. Leaves mostly cauline (at flowering); alternate; ± sessile; blades (1-nerved or 3-nerved) narrowly oblanceolate to lance-linear or linear, margins entire, faces glabrous or sparsely hirsutulous. Heads radiate, borne singly. Involucres ± cylindric to turbinate, 1–3 (–5+) mm diam. Phyllaries 11–20+ in 2+ series, 1-nerved (flat) linear to lanceolate or subulate, subequal (distinct), herbaceous, margins scarious, faces hirsutulous (± navicular, each of the inner usually ± enfolding a floret). Receptacles ± flat, obscurely pitted, sparsely paleate (between ray and disc-florets, paleae resembling inner phyllaries). Ray-florets 3–13+ (usually 3, 5, or 8), pistillate, fertile; corollas yellowish, often tinged with red or purple (laminae inconspicuous). Disc-florets 5–70+, bisexual, fertile; corollas pale-yellow, sometimes tipped with purple, tubes shorter than narrowly funnelform throats, lobes 2–4, erect, ± deltate; style-branch appendages subulate to filiform. Cypselae ± cylindric to fusiform, little, if at all, compressed, transversely rugulose, all minutely hirsutulous or ray cypselae glabrous or nearly so; pappi persistent, usually of 3–5 subulate scales (sometimes much reduced or 0 on ray cypselae). x = 9.

Distribution

w North America

Discussion

Species 1.

... more about "Rigiopappus"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
John L. Strother +
A. Gray +
decurrent +
compound +  and simple +
rugulose +  and muricate +
barbellulate +  and barbellate +
pale-yellow +, tinged with red or tinged with purple +  and yellowish +
beaked +, 2-ribbed +  and 5-ribbed +
less cylindric +  and fusiform +
fertile +  and bisexual +
fertile +  and bisexual +
w North America +
Latin rigeo, rigid, and pappus +  and alluding to stiff pappus scales +
hirsutulous +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
less cylindric;turbinate +
deltate +
2-carpellate +
persistent +
linear +  and lanceolate or subulate +
Proc. Amer. Acad. Arts +
nearly +, glabrous +  and hirsutulous +
bearing subulate enations +, hairy +  and bristly +
concave;usually flat;conic +
ornduff1975b +
3 +  and 5 +
subulate +
exalbuminous +
branched +  and simple +
glabrate +, pilosulous +  and hirtellous +
subulate +  and filiform +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Rigiopappus +
Asteraceae tribe Astereae +
5 cm50 mm <br />0.05 m <br /> (30 cm300 mm <br />0.3 m <br />) +
tree +, shrub +  and subshrub +