By Alwyn H. Gentry

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To comprehend nearly any a part of the tropical rain forest's fabulously advanced internet of existence, one needs to first discover ways to determine a bewildering array of crops. Alwyn Gentry's landmark e-book, accomplished in advance of his tragic demise in 1993, is the single box consultant to the approximately 250 households of woody vegetation within the such a lot species-rich quarter of South America.

As a consummate box researcher, Gentry designed this consultant to be not only complete, but additionally effortless to exploit in rigorous box stipulations. in contrast to many box publications, which depend for his or her identifications on vegetation and culmination which are basically current in the course of sure seasons, Gentry's booklet specializes in characters corresponding to bark, leaves, and smell which are current year-round. His advisor is full of transparent illustrations, step by step keys to id, and a wealth of formerly unpublished data.

All biologists, flora and fauna managers, conservationists, and executive officers fascinated by the tropical rain forests will want and use this box guide.

Alwyn Gentry used to be one of many world's ideal specialists at the biology of tropical vegetation. He used to be senior curator on the Missouri Botanical backyard, and was once a member of Conservation International's interdisciplinary quick review application (RAP) crew, which inventories the biodiversity of the main threatened tropical components. From 1967 to 1993 he amassed greater than 80,000 plant specimens, a lot of them new to technological know-how.

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Extra info for A Field Guide to the Families and Genera of Woody Plants of North west South America : (Colombia, Ecuador, Peru) : With Supplementary Notes)

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IIBj. Miscellaneous useful characters for genera or common sp ec ies with pinnately compound alternate leaves · (I) Winged rachis -Individual species of many genera and families: Leguminosae Several unrelated genera have winged rachis: Inga, even-pinnate with glands between · all leaflet pairs; Dipteryx (only subwinged); Swartzia (few species, most obvious in juveniles, odd­ - pinnate). Meliaceae Guarea pterorachis is even-pinnate with many thick leaflets and broad coriaceous rachis wings. - Sapindaceae One tree with even-pinnate leaves with distinctively subalternate leaflets (Sapindus saponaria) and many Hanas (Paullinia and Serjania}, mostly with compound wood and/or bicompound leaves.

Anacardiaceae and Burseraceae - These two families usually have a fairly strong turpentine-Ilke or mangolike odor but are very difficult to tell apart vegetatively; check both families. Anacardiaceae - Usually more weakly turpentine-odored or with a somewhat sweetish mangolike odor (only with a very faintly mango­ like odor in the common Tapirira guianensis which might be taken for a Trichilia with too many leaflets); sometimes with a watery latex which dries black (wounded trunks often stained with black); may be consi- 16 Key to Famities dered a derived version of burseracs differentiated by the technical character of one anatropous ovule per locule or a single ovule in ovary.

Combretaceae - The best vegetative character may be the usually hollow or secretory (discolored when dry) stem center of young branches and the tendency to have even older stems with 1 or 3 mucilage-oozing canals in extreme center. Fibrous bark and leaves typically with rigidly parallel often somewhat raised tertiary venation and brown petioles (sometimes with more or less exfoliating cortex) are typical; the leaves tend to be somewhat subopposite and a few species actually have alternate leaves (these species with stem spines); an interpetiolar line or ridge is never present.

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