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This species is accepted, and its native range is Colombia.

[CATE]

CATE Araceae, 17 Dec 2011. araceae.e-monocot.org

General Description
Semierect vine; caudex to 1.5 m tall, with long slender roots c. 1 mm diam. extending from the nodes; internodes elongated, 2.5–3.5 cm long, c. 5 mm diam.; cataphylls 7.5–9.5 cm long, deciduous. Leaves  spreading from the elongated caudex; petiole terete, 7.4–9 cm long, c. 2 mm diam., drying dark yellow-brown; blade ovate-elliptic, long-acuminate at apex, obtuse at base, 18–19 cm long, 5–6.5 cm wide, 3.2–3.6 × longer than wide, 2–2.5 × longer than petiole, semicoriaceous, drying weakly glossy and dark yellow-brown above, semiglossy and light yellow-brown below; upper surface minutely granular, lower surface with subcylindrical pustules; midrib narrowly raised and drying slightly darker than the surface above, rounded and drying light brown below; primary lateral veins 6–7 pairs, arising at 40–50° angle and arching towards the apex, slightly raised above and below; collective veins arising from the first pair of basal veins, 3–5 mm from margin; basal veins 2 pairs, both free to the base, the 2nd pair weak and confined to the base of the blade; tertiary veins prominulous and reticulate. Inflorescences erect; peduncle slender and elongated, c. 13 cm long, 1 mm diam., drying dark yellow-brown; spathe lanceolate, c. 6 cm long, 7 mm wide, green; spadix yellow, stipitate for 2 mm, cylindrical, 6.5–9 cm long, 3 mm diam., drying dark brown. Flowers 1.7–1.8 mm long, 0.7–0.8 mm wide (dried), 5 visible per spiral, smooth, drying dark yellowbrown; lateral tepals 1.1–1.2 mm wide, the outer margin broadly 2-sided, inner margin nearly straight, often curled outward upon drying; stamens barely emergent, closely arranged around pistil, 0.2 mm long, 0.25 mm wide, thecae ovate, slightly divaricate.
Distribution
Endemic to Colombia, known only from the type locality in Valle Department.
Habitat
Premontane rain forest transition life zone.
Diagnostic
The species is a member of Anthurium sect. Xialophyllium and is characterised by its terrestrial habit, elongated internodes, sulcate petioles, brown-drying ovate-elliptic, long-acuminate leaf blades, the  long-pedunculate inflorescence with a slender, erect-spreading green spathe and slender, elongate, yellow spadix. Also characteristic are the prominulous tertiary veins and subcylindrical pustules on the lower leaf surface.

The species is most similar to Anthurium cardenasii Croat from the eastern slopes of the Cordillera Central at 850 m elevation. Both A. maasii and A. cardenasii have remarkably similar leaves with similar shape and colouration, but A. maasii differs in having the lower blade surface somewhat paler and more matte, by having the reticulate veins less closely aggregated and with the upper midrib only slightly thicker than broad. In addition, the areoles are sparsely granular with frequent pustules. In contrast, A. cardenasii has the areoles minutely and finely granular, lacks pustules and also has the upper midrib markedly thicker than wide. Were it not for the radical differences in range and elevation these two taxa might be considered only morphological variations of a single species, but in the light of the existing range of these two species it is highly unlikely that they are the same.

Anthurium maasii should be compared with A. pulchellum Engl., A. purdieum Schott and A. stipitatum Benth., but all these differ in having long-stipitate spadices and the first two also differ in having persistent, rather than deciduous cataphylls. Also, A. stipitatum has a purple instead of a yellow spadix as has A. maasii.

[CPLC]

Bernal, R., Gradstein, S.R. & Celis, M. (eds.). 2015. Catálogo de plantas y líquenes de Colombia. Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá. http://catalogoplantasdecolombia.unal.edu.co

Distribution
Endémica y nativa en Colombia; Alt. 150 m.; Pacífico.
Morphology General Habit
Hierba, trepadora
Conservation
No Evaluada

Native to:

Colombia

Anthurium maasii Croat appears in other Kew resources:

First published in Willdenowia 40: 89 (2010)

Accepted by

  • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

Literature

CATE Araceae

  • Croat, T.B., Delannay, X. & Kostelac, C. 2010. New species of Araceae from Colombia. Willdenowia, 40 (1), 63-122.

CATE Araceae
Haigh, A., Clark, B., Reynolds, L., Mayo, S.J., Croat, T.B., Lay, L., Boyce, P.C., Mora, M., Bogner, J., Sellaro, M., Wong, S.Y., Kostelac, C., Grayum, M.H., Keating, R.C., Ruckert, G., Naylor, M.F. and Hay, A., CATE Araceae, 17 Dec 2011.
http://creativecommons.org/licenses/by-nc-sa/3.0

Catálogo de Plantas y Líquenes de Colombia
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0