Hypericum humboldtianum is a species of shrubby flowering plant in the St. John's wort family Hypericaceae native to Colombia and Venezuela.
The closest relative of Hypericum humboldtianum is Hypericum callacallanum in Peru, which has three-nerved sessile leaves and larger flowers.
Hypericum humboldtianum grows NaNcm (-2,147,483,648inches) tall, with pseudo-dichotomous, divergent or lateral branches. The orange to brown four-lined stems are ancipitous when young and become terete, with their cortex exfoliating in strips. The internodes are NaNmm. The sessile or shortly pseudopetiolate leaves are spreading and deciduous, with pseudopetioles 0.5mm long. The oblong or oblanceolate leaves are NaNmm long and NaNmm wide, and are planar or incurved with a prominent midrib. The glaucous and coriaceous leaves have an acute to obtuse apex, a narrow base, and a sheathing pseudopetiole. Leaves have a single basal vein with or without lateral branches, and lack tertiary reticulation. The laminar glands are dense. The inflorescence is one to twelve flowered, branching dichasially or pseudo-dichotomously, with peduncles and pedicels NaNmm long. The star-shaped flowers are 15mm wide. The elliptic to oblanceolate sepals are NaNmm long and NaNmm wide, with three to five veins and a midrib not prominent. The glands of the sepals are linear below, becoming punctiform in the upper third to upper half. The bright yellow, obovate petals are NaNmm long and NaNmm wide, with linear glands becoming punctiform distally. The thirty to fifty stamens are 5.5mm long at the most. The ovoid to cylindric ovary is NaNmm long and 1mm wide. The three styles are about NaNmm long. The stigmas are capitate. The cylindric-ellipsoid capsule is NaNmm long and NaNmm wide, equalling the sepals. The seeds are NaNmm long and lack carinas.[1]
Hypericum humboldtianum grows in thickets and on slopes of páramo at altitudes between NaNm (-2,147,483,648feet). In Colombia the shrub grows from Valle del Cauca to Norte de Santander and in Venezuela it grows in Mérida.[1]