A New Species of Parathesis (Myrsinaceae) from Honduras Jon M. Ricketson Missouri Botanical Garden, P.0. Box 299, St. Louis, Missouri 63166—0299, U.S.A. [email protected] ABSTRACT. While preparing the treatment of Myr- oblong-elliptic, 14.6—18.1 X 4.6—/.I cm, apically sinaceae for the Flora Mesoamericana a new spe¬ acute to acuminate, with an acumen 0.7-1.5 cm cies of Parathesis was discovered from Olancho, long, basally acute to obtuse, decurrent on the pet¬ Honduras. Parathesis pipolyana is described and iole, conspicuously and prominently punctate and illustrated, and its phylogenetic relationships are punctate-lineate, sparsely to densely stalked stel¬ discussed. late tomentellous to tomentose over the majority of the blade, not bizonal, the stalked stellate hairs of¬ RKSUMEN. A1 preparar un tratamiento taxonomico ten breaking off apically and then appearing like de la familia Myrsinaceae para Flora Mesoameri¬ glandular-villous hairs, but always densely tomen¬ cana, se descubrio una nueva especie pertene- tose along the midrib above and below, the midrib ciente al genero Parathesis proveniente de Olan¬ impressed above, prominently raised below, the cho, Honduras. Se describe e ilustra Parathesis secondary veins 13 to 25 pairs, conspicuously im¬ pipolyana, y se discute su parentezco. pressed above, prominently raised below, the mar¬ Key words: Flora Mesoamericana, Honduras, gins serrate to dentate and mostly densely tomen¬ Myrsinaceae, Olancho, Parathesis. tellous; petiole slender, marginate, 1.7-2.8 cm long, densely tomentose. Inflorescences lateral. In¬ The genus Parathesis (A. DC.) Hooker!, contains to tripinnately paniculate, 7-14 X 2.5-5.5 cm, py¬ 92 species distributed from northern Mexico to ramidal, shorter than the leaves, the rachis densely Panama, the Caribbean basin, and throughout the mixed tomentose of rufous papillae and sessile, Andes from Venezuela to Bolivia as well as adja¬ short or long stipitate dendroid trichomes, the cent Brazil. The genus is defined by the unique branches 3- to 9-flowered corymbose; peduncles glandular papillae of the calyx and corolla lobes 4.4—6.2 cm long; inflorescence bracts unknown; in¬ and bright yellow anthers. In preparation for the florescence branch bracts unknown; floral bracts treatment of Parathesis for Flora Mesoamericana, a caducous, membranous, lanceolate, 1.2—1.8 X 0.4— new species from Honduras was discovered; it is 0.5 mm, apically acute, basally sessile, conspicu¬ described herewith. ously and prominently punctate and punctate-li¬ neate, glabrous adaxially, sparsely rufous sessile Parathesis pipolyana Ricketson, sp. nov. TYPE: dendroid tomentellous abaxially, the veins incon¬ Honduras. Olancho: alrededor de El filo, 15 spicuous, the margins entire; pedicels in bud slen¬ km al NO de Catacamas, en el Parque Na- der, ungulate, 2—4 mm long, conspicuously and cional de Agalta, 14°59'N. 85°56'W, 1920 m, prominently punctate and punctate-lineate, indu¬ 1 June 1992 (bud), D. Mejia 135 (holotype, ment of mixed rufous papillae, sessile or short stip¬ MO; isotype, EAP not seen). Figure 1. itate multicellular dendroid trichomes. Flowers 5- merous, the following measurements from buds: Propter inflorescentiam lateralem, ramulos rhachid- esque inflorescentiarum etiam laminas foliorum subtus calyx in bud membranous, 1.7—1.9 mm long, the dense grosseque stipitato-stellato- vel glandulari-villoso- tube 0.1-0.3 mm long, the lobes ovate to lanceo¬ tomentosos, necnon laminas membranaeeas secus margi- late, 1.5-1.7 X 0.6-0.8 mm. apically acute, con¬ nes dentatas vel serratas P. vestitae valde arete affinis, sed spicuously and prominently punctate and punctate- ah ea trichomatibus rufis (non ferrugineis) stipitati-den- droideis (nec longi-villosis), denique laminarum nerviis lineate, glabrous adaxially, sparsely to scattered secundariis 13 ad 25 (non 25 ad 3)-jugis statim distin- mixed tomentellous abaxially, the indument con¬ guitur. sisting of glandular papillae and sessile or short Trees 20 m tall. Branchlets slender, ungulate. 3- stipitate-dendroid trichomes, the margins entire; 7 mm diam., densely and coarsely tomentose, the corolla whitish, in bud chartaceous, 2—2.3 mm long, indument composed of rufous stalked stellate tri- the tube 0.3-0.4 mm long, the lobes lanceolate, ehomes. Leaves with blades membranous, elliptic to 1.8-2 X 0.7-0.8 mm, apically attenuate, conspic- Novon 13: 113-115. 2003. 114 Novon Figure I. Parathesis pipolyana Ricketson. —A. Flowering branch. — B. Detail of abaxial leaf surface. —C. Rufous stalked stellate trichome. —D. Flower in bud. A-l) drawn from holotype, D. Mejia 135 (MO). uously and prominently punctate and punctate-li- neate; pistil 1.8—2.2 mm long, the ovary ovate, 0.7— neate, the rufous glandular papillae dense along the 0.8 mm long, conspicuously and prominently margins and apically, glabrous at the base within, punctate and punetate-lineate, glabrous except api¬ densely rufous glandular papillate without, the mar¬ cally with scattered to densely rufous pubescence, gins entire; stamens 1.7-1.8 mm long, the filaments the style 1.2—1.4 mm long, conspicuously and 0.5—0.6 mm long, the stamina] tube to 0.1 mm long, prominently punctate and punetate-lineate, gla¬ the apically free portion 0.1—0.5 mm long, conspic¬ brous except basally with scattered rufous tri- uously and prominently punctate and punctate-li- chornes, the ovules 5 or 6, uniseriate. Fruits un¬ neate, glabrous, the anthers yellow, erect, basifixed, known. lanceolate, 1.6—1.7 X 0.5—0.6 mm, apically acute, apiculate, basally cordate, the connective conspic¬ Distribution. Parathesis pipolyana is known uously and prominently punctate and punetate-li- only from the type collection from the Parque Na- Volume 13, Number 1 Ricketson 115 2003 Parathesis from Honduras cional de Agalta. Olancho, Honduras, growing at ple, sessile or stipitate dendroid, or sessile, sub- 1920 m elevation. sessile, or stipitate stellate with erect and spreading Ecology. This species was collected in montane rays. evergreen tropical forest, dominated by Quercus Parathesis pipolyana is similar to P. vestita Fun¬ and Chusquea. At the present time, the Pinus spe¬ ded in its dentate leaf margins, dense indument cies that are also important in this type of forest throughout, and lateral (axillary) inflorescences, hut are under attack from a beetle, resulting in rela¬ differs by the nature of the indument of the leaf tively more open canopies and drier conditions margins and in the size of the teeth along the leaf (John Pi poly, pers. obs.). Owing to this situation, margins. In Parathesis vestita, the indument of the the species is very likely under threat. branchlets, leaf blades, petioles, and inflorescences Etymology. It gives me great pleasure to dedi¬ consists mostly of long ferrugineous villous hairs cate this new species to my former supervisor, now and rarely includes long stipitate-bifid or stipitate- colleague and mentor in Myrsinaceae, hut most im¬ dendroid hairs; the indument is less dense on the portantly, friend, John J. Pipoly, III, of the Fairchild midrib anti secondary veins. In P. pipolyana the Tropical Garden (FTG). John began his work at indument has more densely matted, erect, rufous Michigan State University (MSG) under John Bea¬ stipitate-stellate hairs. In Parathesis vestita the ad- man, then completed his doctorate at The New York axial leaf blade margins are glabrate or with widely Botanical Garden (NY) on the systematic^ of Cy- scattered, short, simple hairs anti have large teeth, bianthus subg. Grammadenia (Myrsinaceae). He whereas in P. pipolyana the leaf margins have scat¬ presently is the Director of Research at Fairchild tered, stout, simple to rarely stipitate-stellate hairs, Tropical Garden (FTG), and has conducted exten¬ these hairs 0.5-0.8(-l) mm long and set between sive fieldwork in the Neotropics. His numerous small teeth. The density and length of the trichomes publications on the Myrsinaceae will become stan¬ of Parathesis pipolyana is similar only to those dard references for the family for years to come. I found in P. sessilifolia Donnell Smith; however, P. am constantly amazed at his knowledge, under¬ pipolyana is immediately distinguished from that standing, and insights concerning this interesting species because its inflorescence is lateral rather family. than terminal as in P sessilifolia. Parathesis pipolyana belongs to a group of spe¬ Acknowledgments. I thank the Missouri Botan¬ cies within Parathesis with lateral (axillary) inflo¬ ical Garden (MO), Gerrit Davidse, and the Flora rescences, erect anthers, and the indument of the Mesoamericana Project for their support. I hanks branchlets and undersurface of the leaf blades con¬ are due to Roy Gereau (MO) for comments on the sisting of coarse and conspicuous, distinct rufous Latin diagnosis. 1 gratefully acknowledge John Pi¬ trichomes. The trichomes in this group may he sim¬ poly for all his collegial support and teachings.