Pectis rusbyi

Greene ex A. Gray in A. Gray et al.

in A. Gray et al., Syn. Fl. N. Amer. 1(2): 361. 1884.

Common names: Rusby’s chinchweed
Synonyms: Pectis palmeri S. Watson
Treatment appears in FNA Volume 21. Treatment on page 227. Mentioned on page 224.

Annuals, 5–50 cm (taprooted); herbage spicy-scented. Stems erect or ascending, glabrous or sparsely puberulent (in decurrent lines). Leaves linear to narrowly elliptic, 10–50 × 1–5 mm, margins with 1–3 pairs of setae, faces glabrous or sparsely puberulent (dotted on margins with round oil-glands 0.2–0.7 mm). Heads borne singly or in open, cymiform arrays. Peduncles 20–80 mm. Involucres campanulate. Phyllaries distinct, oblong or narrowly obovate, 4–7 × 1–2 mm (dotted with 0–2, subterminal oil-glands plus 2–4 pairs of inconspicuous, round to narrowly elliptic, submarginal oil-glands). Ray-florets 8 (–13); corollas 5–11 mm. Disc-florets (7–) 20–55; corollas 3.5–5 mm (2-lipped). Cypselae 3–4.5 mm, strigillose or short-pilose; ray pappi of 1–4, antrorsely barbed awns 1–4 mm or coroniform; disc pappi of 15–30, antrorsely barbed bristles 2.5–5 mm or coroniform. 2n = 24 (as P. palmeri).


Phenology: Flowering Jul–Oct.
Habitat: Deserts, desert grasslands, arid scrub, dry woodlands
Elevation: 600–1600 m

Distribution

V21-547-distribution-map.gif

Ariz., Mexico (Baja California Sur), Mexico (Sinaloa), Mexico (Sonora)

Discussion

Pectis rusbyi is much less common in Arizona than P. papposa var. papposa, with which it sometimes grows.

Selected References

None.

Lower Taxa

None.
... more about "Pectis rusbyi"
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 +
Greene ex A. Gray in A. Gray et al. +
1 +  and 4 +
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 +
barbellulate +  and barbellate +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Rusby’s chinchweed +
yellow +  and reddened +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
short-pilose +  and strigillose +
cylindric +  and narrowly clavate ribbed or angled +
fertile +  and bisexual +
Ariz. +, Mexico (Baja California Sur) +, Mexico (Sinaloa) +  and Mexico (Sonora) +
600–1600 m +
puberulent +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Deserts, desert grasslands, arid scrub, dry woodlands +
cymiform +, corymbiform +, discoid +  and radiate +
in 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 +
linear +  and narrowly elliptic +
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 /> (0.5 cm5 mm <br />0.005 m <br />) +
deltate +  and lanceovate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
persistent +
coroniform +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Flowering Jul–Oct. +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
3 +  and 15 +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
in A. Gray et al., Syn. Fl. N. Amer. +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
flat;hemispheric +
5 +  and 20 +
exalbuminous +
branched +  and simple to much +
ascending +  and erect +
puberulent +  and glabrous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Pectis palmeri +
Pectis rusbyi +
species +
cylindric +
toothed +  and entire +
5 cm50 mm <br />0.05 m <br /> (50 cm500 mm <br />0.5 m <br />) +
50 cm500 mm <br />0.5 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
shrub +  and subshrub +