Buddleja hieronymi is a species endemic to southern Bolivia

Bolivia

Bolivia officially known as Plurinational State of Bolivia , is a landlocked country in central South America. It is the poorest country in South America...

 and northern Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

 first described and named by Fries

Robert Elias Fries

Robert Elias Fries , the youngest son of Thore M. Fries and grandson of Elias Magnus Friesand an expert on mushrooms...

 in 1905.

Description

B. hieronymi is a dioecious

Dioecious

Dioecy is the property of a group of biological organisms that have males and females, but not members that have organs of both sexes at the same time. I.e., those whose individual members can usually produce only one type of gamete; each individual organism is thus distinctly female or male...

 shrub 1 - 1.5 m high with greyish rimose bark. The old naked branches often persist, while the youngest branches are tomentulose

Tomentum

Tomentum may refer to the following:*In botany, a covering of closely matted or fine hairs on plant leaves. *A network of minute blood vessels in the brain.* Tomentum in zoology are a short, soft pubescence...

, bearing small oblong

Leaf shape

In botany, leaf shape is characterised with the following terms :* Acicular : Slender and pointed, needle-like* Acuminate : Tapering to a long point...

  subsessile

Sessility (botany)

In botany, sessility is a characteristic of plants whose flowers or leaves are borne directly from the stem or peduncle, and thus lack a petiole or pedicel...

 leaves 0.5 - 3 cm long by 0.4 - 1 cm wide, membranaceous or subcoriaceous, tomentulose to glabrescent

Glabrousness

Glabrousness is the technical term for an anatomically atypical lack of hair, down, or similar structures...

 above, and tomentose

Tomentum

Tomentum may refer to the following:*In botany, a covering of closely matted or fine hairs on plant leaves. *A network of minute blood vessels in the brain.* Tomentum in zoology are a short, soft pubescence...

 below. The yellowish-white inflorescence

Inflorescence

An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Strictly, it is the part of the shoot of seed plants where flowers are formed and which is accordingly modified...

 comprises one globose head 0.5 - 0.7 cm in diameter formed by 6 - 9 flowers, with occasionally a pair of smaller heads below. The tubular corolla is 2.5 - 3 mm long.