Shinnersoseris

Tomb

Sida 5: 186, figs. 1–3. 1974.

Common names: Beaked skeleton-weed
Etymology: For Lloyd H. Shinners, 1918–1971, American botanist
Treatment appears in FNA Volume 19. Treatment on page 368. Mentioned on page 214, 219, 370.
 TaxonIllustrator 
FNA19 P39 Shinnersoseris rostrata.jpegShinnersoseris rostrata
Lygodesmia juncea
Lygodesmia texana
Bee F. Gunn
Bee F. Gunn
Bee F. Gunn

Annuals, 5–85 cm (herbage glabrous); taprooted (roots deep, slender to thick). Stems usually 1, erect, simple proximally, branched distally, glabrous. Leaves cauline (opposite proximally); ± sessile; blades linear to filiform, margins entire. Heads borne singly. Peduncles not inflated distally, usually bracteate. Calyculi of 8, ovate to lanceolate bractlets. Involucres narrowly cylindric, 4–5 mm diam. Phyllaries 8 in 1–2 series, linear, margins scarious, apices acute (keeled). Receptacles flat, pitted, glabrous, epaleate. Florets 8–11; corollas pale-purple or lavender, with white-tips. Cypselae pale green or tan, subcylindric to ± fusiform, apices abruptly constricted, not beaked, ribs 8–10, scabrous distally; pappi of 30–50, basally connate, white, ± equal, smooth or barbellulate bristles in ± 1 series. x = 6.

Distribution

c North America

Discussion

Species 1.

Shinnersoseris rostrata was included in Lygodesmia; Tomb presented evidence for placing it in a separate genus. It differs from Lygodesmia in having opposite proximal leaves, shorter, obscure ligules, shorter style branches, 8–10-ribbed cypselae, echinate pollen, and a different base chromosome number (x = 9 in Lygodesmia.)

Selected References

None.

"fine" is not a number.

... more about "Shinnersoseris"
constricted +
scarious +
ovate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
David J. Bogler +
decurrent +
compound +  and simple +
linear;filiform +
tuberculate +, rugose +, muricate +  and smooth +
filiform +
Beaked skeleton-weed +
zygomorphic +, actinomorphic +  and (3-)5-merous +
lavender +  and pale-purple +
tan +  and pale green +
subcylindric +  and more or less fusiform +
c North America +
For Lloyd H. Shinners, 1918–1971, American botanist +
winged +  and beaked +
dispersed +
indeterminate +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
divided +, lobed +  and dentate +
2-carpellate +
barbellulate +  and smooth +
connate +  and distinct +
subequal +  and unequal +
flat;convex +
8 +  and 10 +
exalbuminous +
branched +  and simple +
appendaged +  and truncate +
papillate +
Undefined tribe Lactuceae +
Shinnersoseris +
Asteraceae tribe Cichorieae +
5 cm50 mm <br />0.05 m <br /> (85 cm850 mm <br />0.85 m <br />) +
shrub +  and subshrub +