River False Buttonweed (Spermacoce confusa)
Description
Annual herb 30-90 cm. tall, with generally erect angled stems, the angles mostly rather rough, often with very short stiff papilla-like hairs, particularly just below the nodes. Leaf-blades linear-lanceolate to narrowly elliptic, 2.5-5 cm. long, 0.2-1.3 cm. wide, acute or acuminate at the apex, cuneate at the base, shortly to densely scabrid above and on the nerves beneath; petiole very short; stipule-sheath - 1 mm. long, with several fimbriae 1-2 mm. long. Calyx-tube narrowly turbinate, 1.5 mm. long; lobes triangular, - 0.5 mm. long. Corolla white, white and pink or pale mauve; tube - 1.5 mm. long; lobes ovate, - 0.5 mm. long. Capsule ellipsoid to subglobose, 2-2.5 mm. long, 1.5 mm. wide, finely wrinkled striate, glabrous to densely hairy, crowned with the short calyx-lobes. Seeds dark chestnut-brown, narrowly ellipsoid, 1.6-1.8 mm. long, 0.8 mm. wide, scarcely pitted (fide Rendle), very distinctly reticulate-foveolate (in African material).
Taxonomic tree
-
Domain: Eukarya
-
-
Kingdom: Plantae
-
-
Phylum: Magnoliophyta
-
-
Class: Magnoliopsida
-
-
Order: Gentianales
-
-
Family: Rubiaceae
-
-
Genus: Spermacoce
-
-
-
-
-
-
