Harvard Papers in Botany Volume 21, Number 2 December 2016 A Publication of the Harvard University Herbaria Including The Journal of the Arnold Arboretum Arnold Arboretum Botanical Museum Farlow Herbarium Gray Herbarium Oakes Ames Orchid Herbarium ISSN: 1938-2944 Harvard Papers in Botany Initiated in 1989 Harvard Papers in Botany is a refereed journal that welcomes longer monographic and floristic accounts of plants and fungi, as well as papers concerning economic botany, systematic botany, molecular phylogenetics, the history of botany, and relevant and significant bibliographies, as well as book reviews. Harvard Papers in Botany is open to all who wish to contribute. Instructions for Authors http://huh.harvard.edu/pages/manuscript-preparation Manuscript Submission Manuscripts, including tables and figures, should be submitted via email to [email protected]. The text should be in a major word-processing program in either Microsoft Windows, Apple Macintosh, or a compatible format. 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Publication Exchange Agreements Please send inquiries to [email protected] or to the Serials Acquisition Manager at Serials Acquisitions & Exchanges, Harvard Botany Libraries, 22 Divinity Avenue, Cambridge, MA 02138, U.S.A. To meet our publication exchange agreements, we are currently developing a mechanism to supply an electronic copy of each issue to the institutions with which we maintain an exchange program. For all other questions and/or to order back issues, please email [email protected]. Harvard Papers in Botany Volume 21, Number 1, was published online July 25, 2016. Editor: GUSTAVO A. ROMERO Managing Editor: Nomenclature Editor: DEBORAH SMILEY KANCHI N. GANDHI Editorial Board: DAVID E. BOUFFORD RODRIGO DUNO FRANK ALMEDA GERARDO A. AYMARD SARAH MATHEWS LISA CAMPBELL IHSAN AL-SHEHBAZ JASON GRANT Cover: Masdevallia utriculata Luer. (see page 329, Figure 3). Drawing by L. Oses. Harvard Papers in Botany Volume 21, Number 2 December 2016 A Publication of the Harvard University Herbaria Including The Journal of the Arnold Arboretum Ihsan A. Al-Shehbaz Lepidium seydelii (Brassicaceae), a new species from Namibia 133 Manuel Luján Clusia Scariosepala (Clusaceae), a distinct species of Clusia sect. Anandrogyne 137 endemic to the Venezuelan Andes William Cetzal-Ix, Germán Carnevali Fernández-Concha, and Gustavo Romero-González Synopsis of the Trichocentrum-clade (Orchidaceae, Oncidiinae) 141 Adam P. Karremans, Diego Bogarín, Melissa Díaz-Morales, Melania Fernández, Lisbeth Oses, and Franco Pupulin Phylogenetic reassessment of Acianthera (Orchidaceae: Pleurothallidinae) 171 Maria Lúcia Kawasaki and Daniel Santamaría-Aguilar A new species of Calyptranthes (Myrtaceae) from Peru 189 Carlyle A. Luer Icones Stelidarum (Orchidaceae) Colombiae II 193 Saman A. Ahmad Salvia Ali-Askaryi (Lamiaceae), a new species from Kurdistan, Iraq 227 Paul Ormerod Neotropical orchid miscellanea 231 Lisa Thoerle and Xavier Cornejo Lepanthopsis kayi (Pleurothallidinae, Orchidaceae), a new species from eastern Ecuador 247 Robert L. Dressler, Marco Acuña, and Franco Pupulin Sobralia turrialbina (Orchidaceae: Sobralieae): long cultivated and now described 251 Franco Pupulin, Diego Bogarín, Melania Fernández, Melissa Díaz-Morales, Jaime Aguilar, and Carlos Ossenbach Orchidaceae Tonduzianae: typification of Costa Rican Orchidaceae 263 described from collections of Adolphe Tonduz Franco Pupulin A note on three “new” species of Xylobium (Orchidaceae, Maxillariinae) 321 from Ruiz and Pavón’s Peruvian collections Lizbeth Oses Salas and Adam P. Karremans A note on Masdevallia Zahlbruckneri and M. Utriculata (Orchidaceae) 325 Xavier Cornejo and Carmen Ulloa Ulloa Ternstroemia washikiatii (Pentaphylacaceae): a new tree species from Eastern Ecuador 337 Index to New Names and Combinations 341 Page ii intentionally left blank. LEPIDIUM SEYDELII (BRASSICACEAE), A NEW SPECIES FROM NAMIBIA IHSAN A. AL-SHEHBAZ1 Abstract. Lepidium seydelii (Brassicaceae), a new species from Namibia, is described and illustrated. It is easily distinguished from the closely related to L. divaricatum and all other southern African species of Lepidium by having pubescent, elliptic to elliptic-ovate fruit 1.3–1.6 × 1–1.2 mm and fruiting pedicels densely hirsutulous all around. A key distinguishing the four species of Lepidium native to Namibia is presented. Keywords: Brassicaceae, Cruciferae, Lepidium, Namibia. Lepidium L., the second largest genus in the family length, median; filaments 0.3–0.4 mm, glabrous, slender at Brassicaceae (Cruciferae) after Draba L., includes at least base; anthers ovate, ca. 0.1 mm; nectar glands 4, toothlike. 250 species (Al-Shehbaz, 2012) represented by native Fruit dehiscent, elliptic to elliptic-ovate, 1.3–1.6 × 1–1.2 species on all continents except Antarctica (Al-Shehbaz, mm, strongly angustiseptate, not inflated; valves papery, 1986). The limits of Lepidium have expanded a great veinless, pubescent with spreading trichomes to 0.05 mm, deal based on extensive molecular, developmental, and smooth, strongly keeled, apically minutely winged; apical morphological studies, and the interested reader should notch V-shaped, 0.05–0.12 mm deep; septum complete; consult Al-Shehbaz & Mummenhoff (2011) for leads. style 0.05–0.12 mm, subequaling apical notch of fruit; During work on a worldwide monograph of Lepidium, stigma capitate, entire. Seeds 1 per locule, oblong, 0.7–0.85 an unusual, Namibian, densely hirsutulous specimen of the × 0.4–0.5 mm, wingless, light brown, minutely reticulate; genus was found among the undetermined South African cotyledons incumbent. material at the Missouri Botanical Garden. An attempt to Eponymy: This novelty is named in honor of R. Seydel identify it following Thellung (1906 a, b) and Marais (1970) who collected the type material. clearly showed that it did not fit in any of the known native Habitat: rocky, steep slopes. species in that part of the continent, and it is described below. IUCN Red List Category: Lepidium seydelii is known only from the type collections above. A full conservation Lepidium seydelii Al-Shehbaz, sp. nov. Type: Namibia, assessment cannot be determined at this point and, therefore, Windhuk Bergland Avis, 20 April 1965, 1600 m, B. Seydel according to the IUCN (2001) classification, I prefer to give 4365 (Holotype: MO 2008117; Isotypes: B_10-0699398, it a Data Deficient (DD) criterion. B_10-0699399). Fig. 1. Lepidium seydelii is easily distinguished from all of its Herbs, perhaps perennial, densely hirsutulous throughout. congeners in southern Africa by having pubescent fruit and Trichomes slender, straight, spreading. Stems 20–30 cm, fruiting pedicels densely hirsutulous all around. The other ascending, slender, few from base, much branched above species always have glabrous fruit and fruiting pedicels the middle, hirsutulous with spreading trichomes 0.05– either puberulent adaxially or glabrous. It is most closely 0.12 mm. Basal leaves not seen; middle cauline leaves related to L. divaricatum Ait., a species restricted to South oblanceolate, 1.5–2.5 cm × 3–6 mm, densely hirsutulous Africa and Namibia. In addition to the differences above, it with spreading trichomes 0.05–0.22 mm, attenuate to can also be distinguished from the latter species by having petiole-like base, not auriculate, margin serrulate with up to shorter fruiting pedicels (1.4–2 vs. 2–3.5 mm) and sepals 6 minute teeth on each side; upper leaves gradually reduced (ca. 0.4 vs. 0.6–1 mm), style subequaling (vs. shorter than) in size upwards, uppermost apically 3-toothed. Racemes the apical notch of fruit, and smaller petals (ca. 0.1 × 0.05 ebracteate, corymbose, dense, much elongated in fruit but vs. 0.3–0.9 × ca. 0.1 mm), fruit (1.3–1.6 × 1–1.2 vs. 2.3–3.7 not so towards end of season, main branches up to 12 cm × 1.8–2.3 mm), and seeds (0.7–0.85 × 0.4–0.5 vs 1–1.3 × or more and with 100 or more fruit; rachis straight, densely 0.5–0.7 mm). hirsutulous as stem; fruiting pedicels 1.4–2 mm, densely Based on Marais (1970), Namibia (as Southwest Africa) hirsutulous all around, terete, wingless, ascending along has only three native species of Lepidium, including L. proximal half, arcuate-recurved along distal half, persistent. desertorum Eckl. & Zeyh., L. divaricatum, and Coronopus Sepals ovate, ca. 0.4 mm, caducous, ascending, equal; petals integrifolius (DC.) Spreng. (herein as L. englerianum white, erect, much shorter than sepals, ca. 0.1 × 0.05 mm, (Muschl.) Al-Shehbaz. These and L. seydelii can easily be blade oblong, apex obtuse, claw absent; stamens 2, equal in distinguished by the following key. I am grateful to Sarah Bollendorff for locating the isotype sheets at the Botanisches Museum Berlin-Dahlem (B). I also thank Gustavo A. Romero and Deborah Smiley for their editorial advice. Partial funding for this research was supported by the United States National Science Foundation grant DEB-1252905, for which I am profoundly grateful. 1 Missouri Botanical Garden, 2345 Tower Grove Avenue, St. Louis, Missouri 63110, U.S.A.; [email protected] Harvard Papers in Botany, Vol. 21, No. 2, 2016, pp. 133–135. © President and Fellows of Harvard College, 2016 ISSN: 1938-2944, DOI: 10.3100/hpib.v21iss2.2016.n1, Published online: 31 December 2016 134 HARVARD PAPERS IN BOTANy VOL. 21, NO. 2 FIGURE 1.