Pectis glaucescens

(Cassini) D. J. Keil

Sida 11: 386. 1986.

Common names: Sand dune chinchweed
Basionym: Chthonia glaucescens Cassini in F. Cuvier, Dict. Sci. Nat. ed. 2, 9: 173. 1817
Synonyms: Pectis leptocephala (Cassini) Urban Pectis lessingii Fernald
Treatment appears in FNA Volume 21. Treatment on page 225. Mentioned on page 224, 226.

Annuals or perennials, 2–50 cm (across or high); herbage spicy-scented. Stems prostrate to erect, usually sparsely to densely puberulent (sometimes in decurrent lines), sometimes glabrate. Leaves narrowly linear, 10–35 × 0.2–1.8 mm, margins with 1–5 pairs of setae 1–2 mm, faces glabrous (abaxial submarginally dotted with broadly elliptic to circular oil-glands 0.2–0.3 mm, sometimes with additional, scattered oil-glands). Heads borne singly or in diffuse, cymiform arrays. Peduncles filiform, (3–) 7–35 (–54) mm. Involucres cylindric. Phyllaries distinct, linear-oblanceolate, 4–5 × 0.8–1 mm (dotted with 1–2 elliptic, subapical oil-glands 0.2–0.3 mm, sometimes with additional, smaller submarginal or scattered oil-glands). Ray-florets 5; corollas 3.5–5 mm. Disc-florets 3–7; corollas 2–3 mm (2-lipped). Cypselae 2.5–3 mm, strigillose; pappi of 0–5, antrorsely scabrid bristles or slender scales 1–2 mm plus 0–5 entire or irregularly lacerate scales 0.2–0.7 mm. 2n = 48.


Phenology: Flowering year round.
Habitat: Sandy or gravelly soils, grassy areas, openings in pinelands, scrub, roadsides
Elevation: 0–50 m

Distribution

V21-543-distribution-map.gif

Fla., West Indies (Bahamas), West Indies (Hispaniola), West Indies (Jamaica)

Discussion

Pectis glaucescens is widespread in southern Florida and the Bahamas. Human disturbances, especially road constructions, have created habitats suitable for it. It grows most commonly on limestone soils in open, grassy sites. Occasionally, it is a lawn weed.

Selected References

None.

Lower Taxa

None.
... more about "Pectis glaucescens"
not tailed +, rounded +  and obtuse +
darkened +  and pale +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
David J. Keil +
(Cassini) D. J. Keil +
decurrent +
Chthonia glaucescens +
compound +  and simple +
obovate;oblong;obovate;oblong;oblanceolate;linear to elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Sand dune chinchweed +
yellow +  and reddened +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
cylindric +  and narrowly clavate ribbed or angled +
fertile +  and bisexual +
Fla. +, West Indies (Bahamas) +, West Indies (Hispaniola) +  and West Indies (Jamaica) +
0–50 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy or gravelly soils, grassy areas, openings in pinelands, scrub, roadsides +
cymiform +, corymbiform +, discoid +  and radiate +
in diffuse , 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 />) +
1 cm10 mm <br />0.01 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
deltate +  and lanceovate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
persistent +
coroniform +
3.5 cm35 mm <br />0.035 m <br /> (5.4 cm54 mm <br />0.054 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
Flowering year round. +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
3 +  and 15 +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
flat;hemispheric +
5 +  and 20 +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
exalbuminous +
lacerate +  and entire +
branched +  and simple to much +
prostrate +  and erect +
glabrate +  and puberulent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Pectis leptocephala +  and Pectis lessingii +
Pectis glaucescens +
species +
cylindric +
toothed +  and entire +
perennial +  and annual +
2 cm20 mm <br />0.02 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 +