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New Taxa and New Combinations in Mesoamerican Spiranthinae (Orchidaceae, Spirantheae)

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New Taxa and New Combinations in Mesoamerican Spiranthinae (Orchidaceae, Spirantheae) Ann. Bot. Fennici 41: 471–477 ISSN 0003-3847 Helsinki 21 December 2004 © Finnish Zoological and Botanical Publishing Board 2004 New taxa and new combinations in Mesoamerican Spiranthinae (Orchidaceae, Spirantheae) Piotr Rutkowski, Joanna Mytnik & Dariusz L. Szlachetko Department of Plant Taxonomy and Nature Conservation, Gdansk University, Al. Legionów 9, PL- 80-441 Gdansk, Poland (e-mails: [email protected], [email protected], [email protected]) Received 15 Dec. 2003, revised version received 10 Apr. 2004, accepted 15 June 2004 Rutkowski, P., Mytnik, J. & Szlachetko, D. L. 2004: New taxa and new combinations in Meso- american Spiranthinae (Orchidaceae, Spirantheae). — Ann. Bot. Fennici 41: 471–477. The following new species of the subtribe Spiranthinae (Orchidaceae, Spirantheae) are described and illustrated: Brachystele tamayoana Szlach., Rutk. & Mytnik and Kionophyton pollardiana Szlach., Rutk. & Mytnik. Keys for determination of the Mesoamerican species of Brachystele, Kionophyton and Galeottiella are provided. The following new combinations are proposed in Spiranthinae: Deiregyne Schltr. subgenus Aulosepalum (Garay) Szlach., Rutk. & Mytnik stat. & comb. nova, Microthelys hin- toniorum (Todzia) Szlach., Rutk. & Mytnik, comb. nova and Galeottiella orchioides (Lindl.) R.Gonzalez T. Key words: nomenclature, Orchidaceae, Spirantheae, Spiranthinae, taxonomy The large subtribe Spiranthinae (Orchidaceae, (1982), were published almost at the same time. Spirantheae) embraces about 30 genera (Szla- They presented fundamentally different taxo- chetko 1995a). This group can be distinguished nomic notions. In the 1990s the problem of by the viscidium, which is produced on the classification of Spiranthinae was taken up by adaxial layer of rostellum, and by the rostel- D. Szlachetko. After detailed studies by him lum remnant being deeply notched or fove- the undoubtedly heterogenous genus Spiranthes olate. All species of this subtribe were once was again divided into several taxa that are now placed in the genus Spiranthes. Such a situa- included in the subtribes Spiranthinae, Stenor- tion prevailed until a revision of Spiranthinae rhynchidinae and Cyclopogoninae. s. lato by Schlechter (1920) was published. The Revising herbarium materials of the tribe author divided Spiranthes into 24 genera, of Spirantheae (Orchidaceae) for Flora Mesoameri- which 17 were described as new. His work was cana we found some specimens that did not fit criticized by American orchidologists (Williams descriptions of any species known so far. Addi- 1951, Schweinfurth 1958), who accused Sch- tionally, we realized that new combinations at lechter of an inconsistent usage of criteria pro- various taxonomic levels in the subtribe Spiran- posed by himself. The genus Spiranthes inflated thinae should be proposed. again. New attempts to revise this heterogenous The genus Brachystele includes 18 species group appeared in the 1980s. Two independent native to South America and the West Indies but studies, by Garay (1982) and by Burns-Balogh until now only three of them have been found in 472 Rutkowski et al. • ANN. BOT. FENNICI Vol. 41 Fig. 1. Brachystele tama- yoana (A–E from Nagel & Juan Gonzales 6656, AMES; F from holotype). — A: Flower. — B: Dorsal sepal. — C: Petal. — D: Lateral sepal. — E and F: Lip. Mesoamerica, viz. B. affinis, B. guayanensis and stricto, sub apicem vel in medio hypochili latis- B. luzmariana. This genus has terrestrial plants simo distinguitur. with small to minute, rarely medium-sized, incon- spicuous and resupinate flowers. Their gynoste- TYPE: Mexico. Baja California, Cape Region, 200 m, mium is characterised by a ventrally positioned, 16–18.V.1959 Thomas 7883 (holotype BM!). bilobed but confluent and nearly flat stigma. The clinandrium is well-developed and membranous, Roots fasciculate, tuberous, fleshy. Leaf and the gynostemium is short but erect, with the single, basal, petiolate; petiole 3.5 cm long, viscidium suspended on its adaxial surface. The narrow; blade 5.5 cm long, 2.3 cm wide, ovate- anther base is set near the stigma base. lanceolate, acute. Scape 16–24 cm long, erect, delicate, completely glabrous. Cauline sheaths 7–9, tubular, acute to acuminate, tightly adnate Brachystele tamayoana Szlach., Rutk. & to scape, scarious, glabrous, usually as long as or Mytnik, sp. nova (Fig. 1) shorter than internodes. Raceme 9–10 cm long, ca. 25–45-flowered, lax or sublax, all-sided. Species nova B. luzmarianae et B. affini accedit, Flowers small, inconspicuous, white. Floral sed prior species a nostra labello duplo majore, bracts 5–6 mm long, ovate-lanceolate, acumi- nervatio simplici et hypochilo pandurato-sub- nate, scarious, glabrous. Pedicel 0.5–1.5 mm quadrato, secundo labello supra medio con- long, twisted, glabrous. Ovary 1.5–3 mm long, ANN. BOT. FENNICI Vol. 41 • New taxa and new combinations in Mesoamerican Spiranthinae 473 narrowly cylindrical, glabrous. Sepals dissimilar, The genus Deiregyne was established by connate at base only, glabrous. Dorsal sepal 3–4 Schlechter (1920). It includes nine species found mm long, 1–1.2 mm wide, ovate, subacute to primarily in Mexico but also in Guatemala, Hon- obtuse, concave in centre, 1-nerved. Petals 2.8– duras, El Salvador and Nicaragua. The problem 3.5 mm long, 0.9–1 mm wide, falcate, oblong around it arose when Burns-Balogh (1988) and obovate to linear-lanceolate, truncate, 1-nerved. Garay (1982) published conflicting concepts of Lateral sepals 3.1–4.5 mm long, 0.9–1 mm wide, Deiregyne. Those authors lectotypified the genus oblong–lanceolate, subacute, suberect, 1-nerved. differently: Burns-Balogh chose Spiranthes Lip twice as long as wide, with simple nervation, hemichrea Lindl. as the type, while Garay chose shortly clawed; claw 0.5 mm long; lamina con- Spiranthes chloreaeformis A. Rich. & Gal. As a stricted near the apical third; hypochile 2–3 mm result, different species were included in Deir- long, 1.3–1.9 mm wide, pandurate-subquadrate, egyne by the two authors (Table 1). According widest near apex, with small, basal, subglobose to Szlachetko (1995b) the lectotype proposed by thickenings; epichile 1–1.5 mm long, 1.4–2 mm Burns-Balogh was more in accordance with the wide, transversely elliptic, truncate to shallowly protologue than that proposed by Garay. bilobulate, with minutely denticulate margins. Species belonging to Deiregyne are terrestrial Gynostemium 2 mm long. plants with erect, usually fairly strong stems, covered with transparent and paper-like cauline ETYMOLOGY: Dedicated to Dr. Roberto Gonzalez Tamayo bracts, usually leafless during flowering. The (IBUG), an eminent Mexican orchidologist. flowers are small or tiny. The sepals form a dis- tinct, basal sepaline tube. The long unguiculate ECOLOGY: Terrestrial in meadows surrounded lip is most frequently divided into hypochile by forests of Quercus and Pinus cembroides, occa- and epichile and adorned with two small, fleshy sionally in open meadows. Flowering in May. processes. The column foot is long and adnate to DISTRIBUTION: Mexico (Baja California, Gua- the long ovary neck. The large viscidium, drop- najuato). Alt. 200 m. ping from the rostellum usually leaves a large, sinuate indentation on its apex. ADDITIONAL SPECIMENS EXAMINED (paratypes). — Mexico. Guanajuato, W of San Miguel Allende, Dickinson 7191. We propose to separate Aulosepalum as a (SEL!). Without precise locality, Nagel & Juan Gonzales subgenus characterised by lateral sepals connate 6656 (AMES!). up to halfway and forming a prominent sepaline tube, and with staminodes fused with the style This species is related to B. luzmariana and distinctly below the stigmatic surface. B. affinis. From the former it differs in having the lip twice as long as wide and with simple nervation, and in the pandurate-subquadrate Deiregyne Schltr. subgenus Aulosepalum hypochile, and from the latter by the lip, which (Garay) Szlach., Rutk. & Mytnik, stat. & is constricted above the middle and widest at the comb. nova apex or in the middle of the hypochile. BASIONYM: Aulosepalum Garay, Bot. Mus. Leafl. Harvard Key to the species of Brachystele in Univ. 28: 298. 1982. Mesoamerica TYPE SPECIES: Deiregyne tenuiflora (Greenm.) Burns- Balogh (= Spiranthes tenuiflora Greenm.). 1. Lip with digitate basal auricles .............. B. guayanensis 1. Lip with a pair of basal, subglobose calli ................... 2. The genus Kionophyton (Garay 1982) 2. Lip entire, widest at deltoid base ..................... B. affinis embraces plants living in humid forests. They 2. Lip constricted above middle, widest at apex or in middle are characterised by possessing foliage at flower- of hypochile ................................................................. 3. ing time, green to yellowish flowers, stem not 3. Lip slightly longer than wide, with a dendritic nervation, hypochile transversely elliptic ................ B. luzmariana concealed by scarious bracts, floral bracts green 3. Lip twice as long as wide, with simple nervation, at flowering time, spike secund, lacking mam- hypochile pandurate-subquadrate ............ B. tamayoana milliform calluses at the base of the lip which 474 Rutkowski et al. • ANN. BOT. FENNICI Vol. 41 is subsagittate. The column is elongate, slender, Burns-Balogh and transferred D. riodelayensis and the lip is subsagittate, canaliculate without to Kionophyton. Gonzalez and Szlachetko (Szla- anastomosing veins, the apex of the lip is papil- chetko 1995b) transferred K. pyramidalis and lose. The viscidium is ventrally sulcate and the K. riodelayensis to the newly proposed genus rostellum
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