MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 8, No. 4 



\ x 



Herbario San Marcos, Museo de Historia Natural, Lima. 

 Naturhistorisches Museum, Wien. 



The entire collection of each number collected by W. H. Camp and his assist- 

 ants in Ecuador has been available for study; the duplicates from these collec- 

 tions will be widely distributed in the near future, but only the New York speci- 

 men has been herein cited. 



All measurements have been cited in millimeters or decimals thereof and were 

 made with a Spencer stereoscopic microscope (No. 23), using both a linear eye- 

 piece scale and an eyepiece reticule. In all coupled dimensions the length is 

 given first, followed by the width or diameter. Solitary dimensions, unless other- 

 wise qualified, are of length. It should again be emphasized that all flower dimen- 

 sions are those at anthesis. 



ACKNOWLEDGMENTS 



The staff of the New York Botanical Garden and many other botanists con- 

 tributed in many ways to the research and writing of this revision. My indebted- 

 ness to them and to the Directors and staffs of the various institutions who lent 

 specimens of Brachyotum for study is very great. In particular, the advice and co- 

 operation of the following persons is gratefully acknowledged: 



Dr. Bassett Maguire, who directed the research and contributed many ideas re- 

 garding this and other problems in the flora of South America. 



Dr. H. A. Gleason, whose critical notes and revisions are the foundation for 

 all recent work in the American Melastomaceae, and who has given freely and fre- 

 quently of his exhaustive knowledge. 



Dr. D. D. Keck, who has read large portions of the preliminary manuscript and 

 whose multitude of suggestions regarding terminology and grammar have been 

 invaluable. 



Dr. D. P. Rogers and Dr. H. W. Rickett, whose critical classical and editorial 

 knowledge have been tapped on too-numerous occasions. 



Mr. N.Y. Sandwith, Mr. J. A. Ewan, Mr. E. P. Killip, and Dr. Rogers McVaugh, 

 who supplied information generously on the history of collectors and collections. 



Miss E. C. Hall and Mr. T. H. Everett, who assisted in all the blind biblio- 

 graphic alleys and suffered many an evening with "brachyotologues. " 



Miss Lucille Kopp, who patiently drew the trichomes in Figures 1-22. 



SYSTEMATIC TREATMENT 

 Brachyotum (DC.) Triana; Benth. & Hook. Gen. Pi. 1: 743. 1867. 



Arthros tern-ma sect. II. Brachyotum DC. Prodr. 3: 136. 1828. 

 Cfraetogastra DC. Prodr. 3: 131, p.p. typ. excl. 1828. 



Shrubs or shrubby trees, with more or less quadrangular, pubescent, decorti- 

 cating branchlets. Trichomes smooth to very shaggy, sometimes gland-tipped. 

 Leaves isomorphic, variously pubescent or tuberculate to nearly glabrous. Flow- 

 ers 4-5-merous, pendulous, solitary or in 2-3-flowered dichasia, the dichasia 

 sometimes aggregated into panicles or corymbs. Hypanthium campanulate, some- 

 times closely invested by one or several pairs of large persistent bracts. Sepals 

 usually erect, without exterior teeth. Petals free but connivent and imbricate in a 

 campanulate tube, usually glabrous except for the cilia. Stamens 8 or 10, isomor- 

 phic, glabrous; anthers lanceolate to oblyrate, uniporose; connective at the anther 

 base exappendicuiate, or ventrally prolonged immediately below and partially ad- 

 herent to the thecae into a more or less bilobed appendage. Style slender, usu- 

 ally glabrous, usually exserted at anthesis; stigma punctiform; ovary free, 4- or 



356 



USM 

 W 



