Pectis papposa

Harvey & A. Gray

Mem. Amer. Acad. Arts, n. s. 4: 62. 1849.

Common names: Common chinchweed
Treatment appears in FNA Volume 21. Treatment on page 227. Mentioned on page 224.

Annuals, 1–30 cm (often forming rounded bushes); herbage spicy-scented. Stems ascending, glabrous or puberulent. Leaves linear, 10–60 × 1–2 mm, margins with 1–3 pairs of setae, faces glabrous (dotted on margins with round to oval oil-glands 0.3–0.5 mm). Heads in congested or open, cymiform arrays. Peduncles 3–40 mm. Involucres campanulate to cylindric. Phyllaries distinct, linear, 3–8 × 0.5–1.7 mm (dotted with 1–5 subterminal oil-glands plus 2–5 pairs of submarginal oil-glands). Ray-florets (7–) 8 (–10); corollas 3–8 mm. Disc-florets 6–34; corollas 2–5.5 mm (weakly 2-lipped, glabrous or glandular-puberulent). Cypselae 2–5.5 mm, strigillose to short-pilose (hair tips curled, bulbous); ray pappi usually coroniform, rarely of 1+ awns or bristles 1–4 mm; disc pappi usually of 16–24, subplumose bristles 1.5–4 mm, rarely coroniform.

Distribution

V21-548-distribution-map.gif

Ariz., Calif., N.Mex., Nev., Tex., Utah, nw Mexico

Discussion

Varieties 2 (2 in the flora).

Pectis papposa generally flowers following summer monsoon rains in the desert of southwestern United States and northern Mexico. In favorable years, it becomes an aspect dominant, coloring wide areas of the desert with its bright yellow heads.

Selected References

None.

Key

1 Phyllaries 3–5 mm; disc florets 6–14(–18); disc pappi 1–2.5 mm Pectis papposa var. papposa
1 Phyllaries 5–8 mm; disc florets 12–24(–34); disc pappi 2.5–4 mm Pectis papposa var. grandis
... more about "Pectis papposa"
not tailed +, rounded +  and obtuse +
darkened +  and pale +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
cymiform +, open +  and congested +
indeterminate +  and determinate +
David J. Keil +
Harvey & A. Gray +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
decurrent +
compound +  and simple +
obovate;oblong;obovate;oblong;oblanceolate;linear to elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Common chinchweed +
yellow +  and reddened +
0.2 cm2 mm <br />0.002 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
strigillose +  and short-pilose +
cylindric +  and narrowly clavate ribbed or angled +
fertile +  and bisexual +
Ariz. +, Calif. +, N.Mex. +, Nev. +, Tex. +, Utah +  and nw Mexico +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
cymiform +, corymbiform +, discoid +  and radiate +
in congested to open , cymiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
spicy-scented +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
campanulate;cylindric +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
deltate +  and lanceovate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
persistent +
coroniform +
0.3 cm3 mm <br />0.003 m <br /> (4 cm40 mm <br />0.04 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
3 +  and 15 +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
Mem. Amer. Acad. Arts, n. s. +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
flat;hemispheric +
5 +  and 20 +
exalbuminous +
branched +  and simple to much +
puberulent +  and glabrous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Tageteae +
Pectis papposa +
species +
cylindric +
toothed +  and entire +
1 cm10 mm <br />0.01 m <br /> (30 cm300 mm <br />0.3 m <br />) +
50 cm500 mm <br />0.5 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
shrub +  and subshrub +