Madisonia Luer (2004: 258)

Smidt, Eric De Camargo, Toscano De Brito, A. L. V., Mauad, Anna Victoria Silvério R. & Morales, Nicolás Gutiérrez, 2021, An expanded concept of Madisonia including miscellaneous species of Pleurothallidinae (Orchidaceae): evidence from molecular analysis, Phytotaxa 505 (1), pp. 71-84 : 77

Madisonia Luer (2004: 258) .

TYPE:— Madisonia kerrii (Braga) Luer (2004: 258) . Fig. 2 , 3 .

Basionym: Pleurothallis kerrii Braga (1981: 172) .

Etymology:—Named in honour of Michael Madison, co-collector of the type specimen.

Plants small, epiphytic or rupicolous, long-repent; rhizome slender, segmented between the ramicauls, nodes with ribbed, slightly ciliate sheaths. Ramicaul shorter than the leaf, enclosed by 1–2 ribbed, more or less ciliate sheaths. Leaf decumbent to erect, cuneate below a short petiole, broadly elliptical to lanceolate, minutely tridenticulate to apiculate, thick to coriaceous. Inflorescence a successively few-flowered raceme, shorter or longer than the leaf. Flower resupinate or not, dark-red to purple, glabrous; dorsal sepal lanceolate to oblong, lateral sepals connate at least to the middle, adnate to the column-foot, sometimes forming a mentum; petals linear to oblong; lip oblong to ovate, trilobed, disc generally smooth, with or without callosities, lateral lobes erect, apical lobe acute to rounded, smooth, pilose or irregular; column semiterete usually bidentate at the apex, anther subapical, stigma ventral.

Distribution:—Know to occur in Trinidad and Tobago and Jamaica in the Caribbean, the Amazon from Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname and Venezuela, and the Brazilian Atlantic Rainforest.

Figures

FIGURE 2. Illustration of Madisonia kerrii (Braga) Luer. A. Habit. B. Detail of the habit. C. Resupinated flower in lateral view. D. Dissected perianth. By Stig Dasltröm based on Luer 17019.

FIGURE 3. Photographs of Madisonia kerrii (Braga) Luer. A. Habit. B. Detail of the habit. C. Detail of the flower in natural position. By Gustavo Romero based on Romero 3371.