Hypericum hookerianum is a glabrous shrub that ranges from in height. Its moderately hard wood is closely grained. The
terete branches of the shrub are a reddish brown. Its obtuse leaves are either
sessile or possess short stalks and taper to a point at their apex. The leaves range beneath from greyish-green to a rusty hue and are faintly
translucent. The leaves are among the largest of the genus, measuring between long. The
cymes of the shrub have few flowers or are
corymbose and possess
bracts. The branches of the
panicle are
dichotomous or trichotomous and bear many opposite leaves that grow smaller as they approach the flowers. The deeply cupped flowers are golden yellow and measure wide. The petals are nearly obovate with
denticulate margins and are longer than the
stamens. The stamens are numerous and are each united into five bundles. The small, spherical
anthers are orange to yellow. The
ovary is broadly ovate and tapers upwards, terminating into five
styles that are recurved at their apex. The
stigma is obtuse and downy. The
calyx is composed of five large, lax, and obovate
sepals. The sepals are united at their base and their membranous margins are denticulate. It flowers in July. ==Distribution and ecology==