Pectis imberbis

A. Gray

Smithsonian Contr. Knowl. 5(6): 70. 1853.

Common names: Tall or beardless chinchweed
Treatment appears in FNA Volume 21. Treatment on page 229. Mentioned on page 224, 230.

Perennials, 30–120 cm (caudices woody, 2–8+ mm diam.); herbage unscented. Stems erect, glabrous. Leaves narrowly linear, 10–50 × 1–2 mm (sometimes smaller, bractlike distally), margins with 0–1 pairs of setae, faces glabrous (abaxial dotted near each margin with a row of elliptic oil-glands ca. 0.3 mm). Heads borne singly or in open, cymiform arrays. Peduncles 10–80 mm. Involucres cylindric. Phyllaries distinct, linear-oblong, 5–9.5 × 1–1.5 mm (each dotted with 1–2 swollen, subapical oil-glands and a row of 2–3 linear, submarginal oil-glands on each side of midrib). Ray-florets 5; corollas 6–11 mm (laminae often dotted near margins with inconspicuous oil-glands). Disc-florets 4–7; corollas 3.7–6 mm (lobes 5, equal, each with 1 subterminal oil-gland). Cypselae 3.5–5 mm, puberulent (hair tips blunt); pappi of 1–3 stout awns 1–2 mm or coroniform. 2n = 24.


Phenology: Flowering Aug–Oct.
Habitat: Pine-oak-juniper woodlands, grasslands, arid shrublands
Elevation: 1000–1700 m

Distribution

V21-557-distribution-map.gif

Ariz., Mexico (Chihuahua), Mexico (Sonora)

Discussion

Pectis imberbis occurs in relatively small, widely separated populations. Overgrazing may be a factor in the scarcity of these plants. They are generally more than 25 cm before they begin to flower and may be unable to reproduce under grazing pressure.

Selected References

None.

Lower Taxa

None.
... more about "Pectis imberbis"
not tailed +, rounded +  and obtuse +
darkened +  and pale +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
cymiform +, congested +  and open +
indeterminate +  and determinate +
David J. Keil +
A. Gray +
1 +  and 3 +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
decurrent +
compound +  and simple +
obovate;oblong;obovate;oblong;oblanceolate;linear to elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Tall or beardless chinchweed +
yellow +  and reddened +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
cylindric +  and narrowly clavate ribbed or angled +
fertile +  and bisexual +
Ariz. +, Mexico (Chihuahua) +  and Mexico (Sonora) +
1000–1700 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Pine-oak-juniper woodlands, grasslands, arid shrublands +
cymiform +, corymbiform +, discoid +  and radiate +
in open , cymiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
unscented +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 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 +
1 cm10 mm <br />0.01 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Flowering Aug–Oct. +
0.5 cm5 mm <br />0.005 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
3 +  and 15 +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
Smithsonian Contr. Knowl. +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
flat;hemispheric +
5 +  and 20 +
exalbuminous +
branched +  and simple to much +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Tageteae +
Pectis imberbis +
species +
cylindric +
toothed +  and entire +
30 cm300 mm <br />0.3 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
50 cm500 mm <br />0.5 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
shrub +  and subshrub +