Herb, (3-)4-6(-11) cm tall, usually unbranched. Stems and branches H 0.1 cm in diam., terete at base to somewhat angled near inflorescence; internodes 0.3-0.8 cm long, somewhat shorter at base. Leaves sessile, arranged along stem, at least half as long as internodes, upper leaves longer than lower ones; blade linear, 0.3-1.3 x 0.1 cm, margin entire, apex acute, base semi-amplexicaul, only primary vein distinct. Inflorescence usually terminal, 1-3-flowered modified dichasia; bracts leaf-like, 5-7 mm long, usually m upper leaves, bracteoles leaf-like, 3-5 mm long; pedicels 3-7(-9) mm long. Flowers erect; calyx green, 5-10 mm long, distinctly 4-winged, connation at least 2/3 of its length, lobes (narrowly) triangular, 1.9-2.5 x 0.3-0.5 mm, ca. same length as corolla tube, margin entire, lightly membranous, apex acute, wings 0.6-1.5 mm broad, with prominent transverse veins; corolla pale yellow, salver- to funnel-shaped, 6-11 mm long, connation at least 3/4 of its length, lobes ovate, 1.5-2 x 1-1.5 mm, margin entire, apex acute; stamens inserted or just to top of tube, 2-2.3 mm long, ca. same length as style, subequal, inserted at corolla tube at 1/2-2/3 from base, filaments white, 1.5-2 mm long, straight, no dentate appendages at base, anthers white or yellow, ellipsoid to globose, 0.5-1 mm long; pistil 8-9 mm long, ovary ovoid, 3.5-4.5 x 1-1.5 mm, dark disk-like ring at base, style white, 2-4 mm long, ca. same length as corolla tube, stigma white or yellow, lobes oblong-ovate, 0.5-1 mm long. Fruit ellipsoid to ovoid, 2-4.5 mm long, calyx and sometimes corolla persistent, calyx wings to ca. 3 mm broad in fruit.
Amazon and Cerrado vegetation: present Guianas: present Guyana, Republic of: present Rupununi Savanna: present Southern America:
Guyana (Rupununi Savanna), Brazil (Amazon and Cerrado vegetation); 5 collections studied, of which 3 from the Guianas (GU: 3).