Euploca filiformis

Euploca filiformis is a small plant that can grow up to 0.25 m tall. Its stems are slender, either erect or decumbent, and can reach up to 0.4 m in length, with a sparse covering of strigose hairs. The leaves are narrowly shaped, with petioles 0.1 to 0.2 cm long, and laminae that are linear, elliptic, lanceolate, or oblanceolate, measuring 1 to 2.5 cm in length and 0.15 to 0.35 cm in width. The apex and base of the leaves are acute, and the margins are entire. Both leaf surfaces are covered with sericeous or strigose hairs. The inflorescences are epedunculate, forming slender scorpioid cymes up to 15 cm long, with scattered, filiform or subulate bracts. The flowers are sub-sessile, with a calyx longer than the corolla tube, and lobes 1.5 to 2 mm long at anthesis. The corolla is white, tubular, and externally strigose, with a narrowed middle section and ovate lobes with broadly open sinuses, approximately 1 mm in length. The stamens are sessile, with anthers that have an apical appendage and are weakly coherent. The ovary is subglobose or globose, strigose, and the style is either absent or nearly so. The stigma is sessile or sub-sessile, with a fertile base significantly wider than the apex of the ovary. The fruit is borne on a 0.5 to 1 mm long pedicel and is depressed-globose, with nutlets nearly 1.5 mm long.

Euploca filiformis is found in a variety of habitats across its native range, which includes parts of Mexico, Central America, and northern South America. It is likely adapted to open or disturbed areas, as is common for many species in the Heliotropiaceae family. Specific habitat preferences are not well documented, but the plant's slender and strigose morphology suggests it may thrive in arid or semi-arid environments.

There is no known information on the cultivation of Euploca filiformis. Given its small size and herbaceous nature, it may be challenging to grow outside of its native range. If cultivated, it would likely require well-drained soil and full sun, with minimal water. Propagation could be attempted from seed, though germination requirements are not documented.

Euploca filiformis is not known to have any significant economic or traditional uses. It appears to be a relatively obscure species, with no reported medicinal, ornamental, or agricultural applications. Its primary value lies in its contribution to the biodiversity of the Heliotropiaceae family and its role in ecological studies within its native range.