''Buddleja tucumanensis'' is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the La Paz Department of

Bolivia , image_flag = Bandera de Bolivia (Estado).svg , flag_alt = Horizontal tricolor (red, yellow, and green from top to bottom) with the coat of arms of Bolivia in the center , flag_alt2 = 7 × 7 square p ...

and to the

Catamarca Province Catamarca () is a province of Argentina, located in the northwest of the country. The province had a population of 334,568 as per the , and covers an area of 102,602 km2. Its literacy rate is 95.5%. Neighbouring provinces are (clockwise, fr ...

Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...

, growing on rocky hillsides, along streams and roads from sea level to 3,300 m. The species was first named and described by Grisebach in 1874.Grisebach, (1874). ''Abh. Königl. Ges. Wiss. Göttingen 19: 213. 1874.Norman, E. M. (2000). Buddlejaceae. ''Flora Neotropica 81''. New York Botanical Garden, USA

Description

''Buddleja tucumanensis'' is a

dioecious Dioecy (; ; adj. dioecious , ) is a characteristic of a species, meaning that it has distinct individual organisms (unisexual) that produce male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproductio ...

shrub 0.5 – 5 m in height, with grey fissured bark. The young branches are terete and covered with

tomentum Tomentum may refer to: * Plant trichomes, a covering of closely matted or fine hairs on plant leaves. * Tomentum (anatomy) Tomentum may refer to: * Plant trichomes, a covering of closely matted or fine hairs on plant leaves. * Tomentum (ana ...

. The lower leaves have petioles < 2 cm long, and blades oblong to ovate, 8 – 15 cm long by 2.5 – 5.5 cm wide, subcoriaceous,

glabrescent Glabrousness (from the Latin ''glaber'' meaning "bald", "hairless", "shaved", "smooth") is the technical term for a lack of hair, down, setae, trichomes or other such covering. A glabrous surface may be a natural characteristic of all or part of ...

above,

tomentose Trichomes (); ) are fine outgrowths or appendages on plants, algae, lichens, and certain protists. They are of diverse structure and function. Examples are hairs, glandular hairs, scales, and papillae. A covering of any kind of hair on a plant ...

lanose A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, ste ...

below, the margin serrate. The upper leaves have shorter petioles, and the blades lanceolate to elliptic 3 – 11 cm long by 1 – 4 cm wide, the margin entire. The yellowish-orange leafy inflorescences comprise hemispheric heads in the

axil A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, st ...

s of the terminal leaves, 5 – 20 heads per branch, each head 1 – 1.5 cm in diameter with 5 – 20 flowers; the corollas 3.5 – 5 mm long.

Ploidy Ploidy () is the number of complete sets of chromosomes in a cell (biology), cell, and hence the number of possible alleles for Autosome, autosomal and Pseudoautosomal region, pseudoautosomal genes. Sets of chromosomes refer to the number of mat ...

: ''2n'' = 38.

Cultivation

''Buddleja tucumanensis'' is not known to be in cultivation beyond Argentina.

References

{{Taxonbar, from=Q13191382 tucumanensis Flora of Argentina Flora of Bolivia Flora of South America Dioecious plants