Caribbean Chinchweed

Pectis carthusianorum Less. Linnaea 6: 712. 1831
A stout leafy annual; stem erect, 1.5-4.5 dm. high, thick, simple or branched above, usually with short erect branches; leaves numerous, oblong-linear or linear, 1.5-4 cm. long, 2-5 mm. wide, connate at the base, with 2-9 pairs of bristles towards the base; glands scattered; heads clustered at the ends of the branches, sessile among the leaves; involucre 5-5.5 mm. high, 2.5-3 mm. broad; bracts 5, oblong-hnear to broadly oblong, obtuse or subtruncate; ray-flowers 5; ligules 2-2.5 mm. long; disk-flowers 7-9; corollas about 3 mm. long; achenes 3.5-4 mm. long, hirsutulous on the angles; squamellae of the disk-flowers 5, of the rayflowers 3 or rarely 4, linear-lanceolate, aristate-acuminate.
Type locality: Santo Domingo.
Distribution: Cuba, Hispaniola, and Porto Rico; also in Venezuela.

Pectis carthusianorum, the Caribbean cinchweed, is a summer blooming annual plant of the genus Pectis, found in Puerto Rico. It is also native to Cuba, Dominican Republic, Haiti, and Venezuela.