Hoffmannia

Abstract: Ten new species of Rubiaceae from southern Mexico and Mesoamerica are described and illustrated: Bouvardia macdougallii Lorence, Hoffmannia ixtlanensis Lorence, H. minuticarpa Dwyer & Lorence, Machaonia martinezorum Lor- ence, Psychotria breedlovei Lorence, P. thornei Lorence, Rondeletia breedlovei Lorence, R. chi- riquiana Lorence, R. megalantha Lorence, and Sommera parva Lorence. During the course of preparing a treatment of the Rubiaceae for Flora Mesoamericana, collec- tions representing a number of undescribed species from southern Mexico and Mesoamerica were en- countered. Many of these collections are the result of recent fieldwork in botanically poorly known or under-collected areas in conjunction with the Flora of Chiapas, Flora de Oaxaca, and Flora Mesoam- ericana projects. Ten new species are described and illustrated herein, and their affinities are discussed. Most of these taxa occur within the region covered by the Flora Mesoamericana project, i.e., southern Mexico from the Isthmus of Tehuantepec to the Panama-Colombia border (Anon., 1982). A com- plete account of the Mesoamerican Rubiaceae will be given in a forthcoming treatment for Flora Me- soamericana (Dwyer & Lorence, in prep.).

Abstract: Eleven new species of Hoffmannia (Rubiaceae) and diagnoses of nine previously described species from Panama are presented. A key to the species is included. The tropical genera Hoffmannia Sw., Hamelia Jacq., and Bertiera Aubl. constitute the tribe Hamelieae of the Rubiaceae, with the first two genera restricted to the tropics of the New World. Paul Standley, in his treatment of Hoffmannia in the North American Flora (Rubiales-Rubiaceae (pars) 32(3): 190-208, 1934), recognized 50 species extending from Mexico to Panama, with two species, H. pedunculata Sw. and H. tubiflora Griseb. & Desv., occurring in the West Indies. Airy Shaw (in Willis, A Dictionary of the Flowering Plants and Ferns ed. 7, Cambridge Univ. Press, 1966) notes that there are 100 species of Hoffmannia. Standley, in the North American Flora (loc. cit., pp. 191-193), as well as in the Flora of Costa Rica (Publ. Field Mus. Nat. Hist., Bot. Ser. 18: 1311-1313, 1938) furnishes the only keys to species of Hoffmannia published in relatively recent times; these are accompanied by specific diagnoses. Hoff mannia is a genus of the rain forest with the majority of species occurring at higher altitudes. In Panama, for example, Hoffmannia is generally found at altitudes of 3000 to 6000 ft, although a few species may occur at sea level or at low elevations. Panama seems to represent a good collecting ground for Hoffmannia and is rivaled or surpassed in number of species only by Costa Rica and Guatemala. The fact that eleven new species from Panama are described in this paper suggests the need for an intensification in the collecting of the genus, at least in Central America. Prior to 1959 only about 50 collections from Mexico and Central America were to be found in the herbarium of the Missouri Botanical Garden, with the majority of these from the Province of Chiriqui in Panama. Not a solitary collection from the Panamanian Province of Darien was numbered among these. In the last decade about 50 new Panamanian collections have been added to the herbarium. Particularly noteworthy are the 1968 collections of Dr. James Duke and Mr. Joseph Kirkbride, Jr. from the provinces of Bocas del Toro, Chiriqui, and Darien. Currently, Hoff mannia is known from seven of the nine provinces of the Republic; thus far the genus has not been collected in the provinces of Herrera and Veraguas. The genus Hamelia seems to be the lowland counterpart of Hoffmannia. In Panama Hamelia is rarely seen at high elevations, although the author has seen H. patens Jacq. in the region of Boquete, Prov. Chiriqui, at approximately 5000 ft elevation. Several-characters give evidence of the natural relationship of the two genera: imbricate petals, numerous ovules borne on axile placentas, reticulate ANN. MISSOURI BOT. GARD. 56(2): 269-286, 1969. This content downloaded from 207.46.13.120 on Thu, 15 Sep 2016 05:33:28 UTC All use subject to http://about.jstor.org/terms

Abstract: Because of its complex taxonomic history, the identity, circumscription, and systematic position of Patima (Rubiaceae) have been nebulous. After a careful morphological analysis. Patima is here recognized as a monospecific genus endemic to the eastern portion of the Guayana Shield. Two names in Rubiaceae are here treated as new synonyms with Patima guianensis Aubl., Patima formicaria 1. M. Johnst. and Hoffmannia megistophylla Standl. Two names described under Patima, P. laxiflora Benth. (here lectotypified) and P. forsythii DC., are shown to belong to other Rubiaceae genera. Aegiphila gleasonti Moldenke (described as a taxon in the Verbenaceae) is another new synonym of Patima guianensis. Patima is here included in the tribe Hamelieae (subfamily Cinchonoideae) because of its morphological features and its overall similarity to Hoffmannia. The presence of raphides in Patima (declared to be absent by previous authors) is here confirmed and discussed. A full account of the taxonomic history and systematic position of Patima, complete typification, complete generic and specific descriplions, a distribution map, a line drawing, photographs of raphides, and observations on ant/plant interaction are provided.