BOLOGY 1 9 ::?9 The person charging this material is re- sponsible for its return to the library from which it was withdrawn on or before the Latest Date stamped below. UNIVEKITY OF ILLINOIS LIUATT AT MtAMA-OiAMPAIGM L161— O-109* FIELDIANA: BOTANY A Continuation of the BOTANICAL SERIES of FIELD MUSEUM OF NATURAL HISTORY VOLUME 31 The Library of the JAN 1 8 1979 FIELD MUSEUM OF NATURAL HISTORY CHICAGO, U. S. A. 520.5 -FB y.3i TABLE OF CONTENTS PAGE 1. Two New Species of Palms from Nicaragua. By S. F. Glassman ... 1 2. Tropical American Plants, VI. By Louis O. Williams 11 3. Agriculture, Tehuacan Valley. By C. Earle Smith, Jr 49 4. Flora, Tehuacan Valley. By C. Earle Smith, Jr 101 5. Preliminary Studies in the Palm Genus Syagrus Mart, and Its Allies. By S. F. Glassman 145 6. Tropical American Plants, VII. By Louis O. Williams 165 7. Supplement to Orchids of Guatemala. By Donovan S. Correll .... 175 8. Preliminary Notes on Scrophulariaceae of Peru. By Gabriel Edwin . . 223 9. New Species in the Palm Genus Syagrus Mart. By S. F. Glassman . . 233 10. Tropical American Plants, VIII. By Louis 0. Williams 247 11. Notes on the Flora of Costa Rica, I. By William C. Burger 273 12. A New Eurystyles from Nicaragua. By Alfonso H. Heller 279 13. New Species in the Palm Genus Syagrus Mart. By S. F. Glassman . . 285 14. A Revision of the Family Geastraceae. By Patricio Ponce de Leon . . 303 15. Studies in American Plants. By Dorothy N. Gibson 353 16. Two New Nicaraguan Juglandaceae. By Antonio Molino R 357 17. Studies in the Palm Genus Syagrus Mart. By S. F. Glassman .... 363 18. Tropical American Plants, IX. By Louis O. Williams 401 NOTES ON THE FLORA OF COSTA RICA, I WILLIAM C. BURGER A NEW EURYSTYLES FROM NICARAGUA ALFONSO H. HELLER NEW SPECIES IN THE PALM GENUS SYAGRUS MART., II S. F. GLASSMAN A REVISION OF THE FAMILY GEASTRACEAE PATRICIO PONCE DE LEON FIELDIANA: BOTANY VOLUME 31, NUMBERS 11, 12, 13, 14 FIELD MUSEUM OF NATURAL HISTORY FEBRUARY 22, 1968 i/flittrsity of Illinois JUL 11 1368 Ml A NEW EURYSTYLES FROM NICARAGUA ALFONSO H. HELLER Associate, Field Museum of Natural History FIELDIANA: BOTANY VOLUME 31, NUMBER 12 Published by FIELD MUSEUM OF NATURAL HISTORY FEBRUARY 22, 1968 PUBLICATION 1037 Library of Congress Catalog Card Number: 67-31600 PRINTED IN THE UNITED STATES OF AMERICA BY FIELD MUSEUM PRESS A New Eurystyles From Nicaragua The orchidaceous genus Eurystyles of the "Spiranthinae" is one of the three genera of this group which Dr. Williams maintained in his Enumeration of the Orchidaceae of Central America, British Hon- duras and Panama (1956). In this work and in his previous ones he took a most conservative view of generic limits in the group. The generic placement of the present species offers some difficul- ties for it shows some characters which indicate that it might belong in Lankesterella — for example, obsolete rostellar processes. However, the majority of characters point to Eurystyles. The geographical origin of this species is of interest. It is the most northern of the half dozen or so species of the genus. Two species are known from Costa Rica and the remaining ones in the genus are South American. Although the distance from the habitats of the known Central American species in Costa Rica is not great, the actual biological break represented by the low San Juan depression, between Costa Rica and Nicaragua, is a rather more formidable one than the actual distance in miles would indicate. Eurystyles borealis Alfonso H. Heller, sp. nov. Herbae epiphyticae parvae usque ad 3 cm. altae. Folia elliptica vel obovata, apiculata, breviter petiolata, in vivo vernicosa; inflorescentia capitata, usque ad 25-flora; sepalum dorsale elliptico-lanceolatum, acutum; sepala lateralia lineari- lanceolata, acuta, bases subscrotiformae; petala lineari-spathulata, obtusa; label- lum spathulatum, trilobulatum, basis angustata; rostellum nullum. Small epiphytic plants to 3 cm. tall. Stems none or very much reduced; roots white, to 2 cm. long and 3 mm. in diameter, obscurely pubescent on the underside; leaves basil, elliptic to obovate, apiculate, short petiolate, strikingly vernicose when living (but not visible in the dried type), margins undulate in living material and obscurely crenulate, shortly and obscurely ciliate, 15-27 mm. long and 8-16 mm. broad; inflorescence congested and capitate, borne on a bracteate, pilose pedicel 1-2 cm. long, flowers about 25 or fewer, the head of flowers about 1.5 cm. long and broad; flowers white, sessile, about 6 mm. long, subtended by ovate, acuminate, fimbriate- ciliate, pubescent bracts to 1 cm. long and about as broad when spread; ovary to about 2 mm. long; sepals with echinate pubescence dorsally above the 279 280 FIELDIANA: BOTANY, VOLUME 31 Front Side FIG. 1. Habit and expanded leaf natural size. Flowers and floral dissections X 10. Drawn from living material by A. H. Heller. middle, dorsal sepal elliptic-lanceolate, acute, about 3.5 mm. long and 1 mm. broad, lateral sepals linear-lanceolate, slightly enlarged and obscurely scrotiform at the base in living material, about 6 mm. long and 1 mm. broad; petals free or lightly adnate to the lateral sepals, linear-spathulate, obtuse, oblique, about 3.5 mm. long and 1 mm. broad; lip spathulate, broadest and trilobulate at the apex, narrowed to a linear claw at the base, obscurely verruculose at the apex; column about 4.5 mm. long, with two porrect teeth below the anther, rostellum obsolete. NICARAGUA: epiphyte in forest, Cerro Villa Flor, about 2 km. south of Honduras border, Dept. Nueva Segovia, December 28, 1966, Heller 10861 (type in Field Museum of Natural History). HELLER: NEW EURYSTYLES FROM NICARAGUA 281 Eurystyles borealis differs from the known species of the genus in lacking a rostellar process. It differs from E. standleyi Ames and E. auriculata Schltr., the other Central American species, in lacking basal auricles on the lip. It is the northernmost species of the genus and the only one north of the San Juan depression. Publications 1036, 1037, 1038, and 1039 JNO, UNIVERSITY OF ILLINOIS-URBANA