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Notes on Some Aroids Along the Rio Negro, Brazil

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Notes on Some Aroids Along the Rio Negro, Brazil NOTES ON SOME AROIDS ALONG THE RIO NEGRO, BRAZIL MICHAEL MADISON The Marie Selby Botanical Gardens, 800 S. Palm Ave., Sarasota, FL 33577 The popular conception of the In the fall of 1978 I spent Amazon basin is a vast flat region several months collecting plants covered with dense forest and in­ along the Rio Negro in the western habited largely by alligators, boa Amazon in connection with the constrictors, and a bewildering Projecto Flora Amazonas, an am­ array of plant life. While this con­ bitious undertaking to prepare a ception contains elements of truth, new flora of the Amazon. Although it differs from reality in several res­ my chief research interests on this pects. To begin with, much of the expedition were not directed to terrain is not especially flat, but is aroids, I was able to make observa­ relieved by cliffs and ravines, roll­ tions and collections of a number ing hills and rocky outcrops. The of species. forest, though dense along the river We started off in Manaus, the margins, is often quite open away capital city of Amazonas, where we from the rivers, especially in those spent several weeks collecting in regions with sandy soils. And the nearby forests and making prepara­ flora, while quite diverse in some tions for our river trip. Manaus is families, is poor in species for located on the banks of the Rio others, including the orchids and Negro a few miles above its junc­ aroids. The Brazilian state of tion with the Amazon, and the Amazonas, which covers more than various bayous and creeks which 15% of the area of tropical South run through the city are lined with America, has an aroid flora of only thriving stands of Montrichardia about seventy species. Many of arborescens (L.) Schott, a large these aroids, including those along terrestrial aroid which obviously the Rio Negro, were first collected benefits from the sewage-enriched and studied in the 1850 's by the waters of the city. Engler (1911) English botanist Richard Spruce, recognized two species of 111ontri­ but they have received little atten­ chardia, and several others have tion since and only a few are been described on the basis of known in cultivation. differences in leaf shape and spini- Research supported by NSF grant No. INT 77-17714. 67 68 AROIDEANA [Vol. 2 Though formerly Manaus could be reached only by boat, it is now connected to several branches of the Amazon highway system. Like all new roads in the tropics, these are simlutaneously a boon and a disaster for botanists. In the early stages they provide easy access to previously remote forests, but that access is equally open to the crowds of colonists who within a few years destroy the forests. The roads connecting to Manaus are at an intermediate stage where wide­ spread destruction is evident but patches of good forest are still easily reached. During the first weeks we had an opportunity to collect plants along several of these roads. Perhaps the richest locality for aroids was a tall forest near Igarape' Taruma, a popular weekend bathing resort reached in 15 minutes from downtown Manaus by public trans­ Figure 1. Juvenile form of an unidentified Philodendron near Manaus. port. A half hour walk from the bus stop leads to a large area of only mildly disturbed forest abounding in palms, marantas, and ness of the stems. However, it aroids. At Taruma, as elsewhere in seems to me that the genus has only Amazon, Philodendron is the most a single species which is both gene­ abundant and diverse aroid genus, tically variable and phenotypically in contrast to the rest of tropical quite plastic. Plants growing along America where anthuriums are small shady streams often have slen­ pre-eminen t. der smooth stems only 1cm thick One of the commonest species and deeply lobed, nearly tripartite at Taruma is Philodendron dis tan­ leaves, while those of more open tiloburn Krause, a climbing species and sunny habitats have thicker, with finely divided pinnate leaves. sometimes spiny stems to 7 cm This shows considerable variation in thick, and sagittae-cordate leaves. the width of the pinnae, with the These extremes and various inter­ most attractive clones having mediates are to be found through­ narrow pinnae deflected upward out Amazonia, depending on local from the midrib. These forms seem habitat. There is little variation in hardly distinct from Philodendron flowers and fruits. elegans Krause of horticulture. 1979] MADISON: RIO NEGRO 69 Figures 2 & 3. Philodendron myremecophilum : occurring in an ant-garden with Aechmea and Peperomia; ants feeding at the extrafloral nectaries. Another species at Taruma with Schott. These were most abundant horticultural potential is Philoden­ in stands of dead trees that had dron traunii Engler, a self-heading been killed by flooding due to road species with persistent fibrous cata­ construction, and in most, individ­ phylls, growing either terrestrially ual colonies of arboreal ants had or epiphytically. In situations constructed their homes among where they receive a high level of the roots. These were in fact the light the stiff, shovel-shaped leaves famous ant-gardens of the Amazon, of P. traunii have bright red petioles arboreal ant nests harboring com­ and red veins, and are quite striking binations of a dozen or so species in appearance. of epiphytes, including gesneriads, To me the most interesting bromeliads, epiphyllums, and philodendrons in this area were two peperomias. What was special about species of very plain appearance, the ant-garden philodendrons, and Philodendron myrmecophilum had apparently not been noticed . Engler and P. c.f. thaliifolium previously, is that they produce 70 AROIDEANA [Vol. 2 Figures 4 & 5. Two of the many forms of the Philodendron williamsii - P. speciosum complex that abound alonl! the Rio Negro. abundant sugary fluid from a ring framework for the nests and the of nectaries located at the junction nectaries are a source of food for of the petiole and the leaf lamina, the ants. Other ant-garden and the ants feed eagerly on this epiphytes, including the gesneriads, fluid. The nectaries are elements of have extrafloral nectaries. The a mutually beneficial relationship biology of these ant-gardens is re­ between ants and epiphytes in ported in detail elsewhere (Ule which the ants serve the philoden­ 1901, Madison 1979a, 1979b}. drons as pugnacious . bodyguards The road from Manaus north to and bring soil and debris to pack the Venezuelan border traverses a around the philodendron roots in region of sandy soils and rather low building their nests, thus providing forest not especially rich in aroids. nutrition to the plants. In turn, the However, several aroids are well es­ philodendron roots provide a tablished as roadside weeds, in- 1979] MADISON: RIO NEGRO 71 By the end of September we had completed our preparations for the river trip, but just before our planned departure the building at the botanical institute that housed our equipment, specimens, and cameras burned to the ground. We spent another week scrounging up substitute equipment and finally in early October set off in a small river boat on a 1000 mile journey up the Rio Negro toward the Colom bian border. Our boat, the Pyata, had a slow speed diesel engine, and its steady ga-dunk ga-dunk ga-dunk came to permeate our lives. During the day a few of us would shoot ahead up­ river in a speedboat, collecting plants along the river margins or occasionally entering the forest. When we had a full load of material we would drop back to the Pyata to prepare our specimens. Figure 6. Another variant in the Philoden­ Our collections from the lower dron williamsii - speciosum complex, part of the riv.er were almost entire­ upper Rio Negro. ly of trees and woody vines. There were hardly any herbs or epiphytes to be had, and the aroids were rep­ eluding Philodendron goeldii G.M. resented chiefly by a single abun­ Barroso (formerly Thaumato­ dant species of Philodendron allied phyllum spruceanum Schott). This to P. williamsii Hook.f. These are is a self-heading species with massive epiphytes, in some areas pedately divided leaves, and like adorning nearly every tree along the many of the other philodendrons of river, and with thick roots hanging subgenus Meconostigma the ripe sixty feet or more to the water. fruits, which we were lucky enough This species is apparently adapted to find, are quite tasty with a flavor to the river margins, for it is rare in combining elements of pineapple the interior of the forest. and banana. Philodendron goeldii We travelled upriver in this not only grows terrestrially in fashion, making steady progress sandy soil at the roadsides, but also until we reached the mouth of the occurs in deep forest as a treetop Rio Marie where we tied up for epiphyte. several days. Immediately on shore 72 AROIDEANA [Vol. 2 Figure 7. Inflorescence of Urospatha c.f. sagittifolia 1979] MADISON: RIO NEGRO 73 from our docking spot was a large stand of Urospatha c.f. sagittifolia (Rodsch.)Schott with the ele­ gant helically twisted spathes typical of that species but differing chiefly in the marking of the spathe, which was pale yellow green with purple spots. The best aroid find at Rio Marie was Alloschemone occidentalis (Poeppig)Engler & Krause, a genus of pinnate-leaved climbers that had been collected only twice before, in 1830 and in 1934. I had a premoni­ tion I might find this species, be­ cause in a Manaus bookshop I had seen a postcard of a river scene on the alto Rio Negro, and in the upper corner was unmistakably a leaf of Alloschemone.
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