Pectis glaucescens (Cass.) D. J. Keil

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.

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.

Chthonia glaucescens Cassini in F. Cuvier, Dict. Sci. Nat. ed. 2, 9: 173. 1817; Pectis leptocephala (Cassini) Urban; P. lessingii Fernald

Pectis leptocephala (Cass.) Urban, Sym. Ant. 5: 280. 1907
Pedis ciliaris Svi. Ohs. i01,m -part. 1791. Not P. ci/iarii 1759. L. Chthonia leptocephala Cass. Diet. Sci. Nat. 27; 206. 1823.
Pecd's /iH i/o/io Less. Linnaea 6: 709, in part. 1831. ^ot P . linifolia ,. 1759. Pectis Lessingii Fernald, Proc. Am. Acad. 33: 67. 1897.
A leafy annual, or becoming perennial; stem diffusely branched, often procumbent, and rooting at the base, up to 2 cm. long, short-pilose along two decurrent lines; leaves linear, 0.7-2 cm. long, 0.5-1.5 mm. wide, acute or obtuse, mucronate at the apex, with 2-4 pairs of bristles towards the base; glands in a single row along each margin; heads solitarjat the ends of the branches or in the forks; peduncles 1-3 cm. long; involucre cylindric, 4-5 mm. high, 1.2-2 mm. broad; bracts 5, oblong-linear or linear, obtuse or rounded at the apex, obtusely carinate below; ray-flowers 5; ligules 2-2.5 mm. long, yellow, often tinged with red; diskflowers 4—7; corollas 2-2.3 mm. long; achenes 2.5 mm. long, short-pilose; squamellae of the disk-flowers 5, rarely 4, and of the ray-flowers 2, with a lanceolate incised base and ending in an awn shorter than the disk-corollas.
Type locality: Not given.
Distribution: Florida, Bahamas, Hispaniola, and Cuba.

Pectis glaucescens, the sanddune cinchweed, is a summer blooming annual plant of the genus Pectis. it is native to Florida, Hispaniola, Jamaica and the Bahamas.

Pectis glaucescens is a freely-branching annual weed with opposing leaves in narrow rows. Leaves contain rows of oil glands on the lower surface. It has long-stalked yellow flowers with two to five small-scale fruits.

Pectis glaucescens là một loài thực vật có hoa trong họ Cúc. Loài này được (Cass.) D.J.Keil mô tả khoa học đầu tiên năm 1986.