Pectis longipes

A. Gray

Smithsonian Contr. Knowl. 5(6): 69. 1853.

Common names: Longstalk chinchweed
Illustrated
Treatment appears in FNA Volume 21. Treatment on page 226. Mentioned on page 224.

Perennials, 8–25 cm (rhizomes branched, 1–10 mm diam.); herbage lemon-scented or spicy-scented. Stems ascending to erect (very leafy), glabrous. Leaves linear to linear-oblanceolate, 10–55 × 1–3 mm, margins with 1–4 pairs of setae, faces glabrous (conspicuously dotted on margins with round oil-glands 0.3–0.5 mm). Heads borne singly. Peduncles (30–) 50–160 mm. Involucres campanulate. Phyllaries distinct, linear, linear-oblanceolate, or linear-elliptic, 5–8 × 0.7–2 mm (dotted with 1–3, swollen, subterminal oil-glands 0.3–0.4 mm plus 1–3 pairs of narrow, submarginal oil-glands). Ray-florets (8–) 13 (–15); corollas 8–12 mm. Disc-florets 25–50; corollas 4–6 mm (2-lipped). Cypselae 2.5–4.5 mm, strigillose (hairs tips acute or blunt); ray pappi of 1–2 awns 3–3.5 mm; disc pappi of 2–30 unequal bristles 3–5 mm. 2n = 24, 48.


Phenology: Flowering Apr–Nov.
Habitat: Grasslands, oak-juniper-mesquite woodlands
Elevation: 900–1700 m

Distribution

V21-546-distribution-map.gif

Ariz., N.Mex., Mexico (Chihuahua), Mexico (Durango), Mexico (Sonora)

Discussion

Pectis longipes has been listed from Texas in floras; I have seen no collections from that state.

Pectis longipes comprises two cytological races. Diploid, spicy-scented plants occur throughout the range. In southern Arizona, the diploid race is broadly sympatric but locally allopatric with a tetraploid, lemon-scented race. The tetraploid race is nested within the range of the diploids. The races are easily separable by odor, and although they are very similar morphologically, they can be separated also by statistically significant differences in floral dimensions and pollen size (M. A. Luckow 1983). Based upon those minute differences, the type collection is diploid. Because the races are so similar morphologically and because so many of the specimens of P. longipes in herbaria bear no indication of odor, I chose not to give the cytological races formal recognition.

Selected References

None.

Lower Taxa

None.
... more about "Pectis longipes"
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 2 +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
decurrent +
compound +  and simple +
obovate;oblong;obovate;oblong;oblanceolate;linear to elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Longstalk chinchweed +
yellow +  and reddened +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
cylindric +  and narrowly clavate ribbed or angled +
fertile +  and bisexual +
Ariz. +, N.Mex. +, Mexico (Chihuahua) +, Mexico (Durango) +  and Mexico (Sonora) +
900–1700 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Grasslands, oak-juniper-mesquite woodlands +
cymiform +, corymbiform +, discoid +  and radiate +
indeterminate +
homogamous +  and heterogamous +
spicy-scented +  and lemon-scented +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
campanulate +
1 cm10 mm <br />0.01 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
linear;linear-oblanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
deltate +  and lanceovate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
persistent +
coroniform +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
5 cm50 mm <br />0.05 m <br /> (16 cm160 mm <br />0.16 m <br />) +
Flowering Apr–Nov. +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
3 +  and 15 +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Smithsonian Contr. Knowl. +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
flat;hemispheric +
5 +  and 20 +
exalbuminous +
Illustrated +
branched +  and simple to much +
ascending +  and erect +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Tageteae +
Pectis longipes +
species +
cylindric +
toothed +  and entire +
8 cm80 mm <br />0.08 m <br /> (25 cm250 mm <br />0.25 m <br />) +
50 cm500 mm <br />0.5 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
shrub +  and subshrub +