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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



3. Amphiphyllum Gleason, Bull. Torrey Club 58: 332. 1931. , 



Cephalar bracts several, the exterior two spathaceous, rigid, more or less 

 valvate and connate; spikelets few, sessile; anthers 4-locular, dehiscing by a 

 laterally subapical pore, the anterior anther cells produced into an appendage ; 

 ovary 3-celled, each cell plnriovulate. 



Type: Amphiphyllum rigidum Gleason. 



Key to the Species of Amphiphyllum 



1. Leaves 4-10 mm broad, strongly nerved; outer cephalar bracts lanceolate, 3-4 cm 



long; inner bracts rigid, narrowly lanceolate. 1. A. rigidum. 



1. Leaves 25-30 mm broad, inconspicuously nerved; outer cephalar bracts broadly 

 orbicular-obovate, ca. 2 cm long; inner bracts membranous, conduplicate. 



2. A. schomburgkii. 



1. Amphiphyllum rigidum Gleason, Bull. Torrey Club 58: 333. 1931. 



Type : in swamp on the slopes of Savanna Hills, summit of Mount Duida, 

 Amazonas, Venezuela, alt.: 4400 ft, G. H. H. Tate 780 (holotype NY). 



Additional specimens: summit Cerro Duida, alt. 1700-1980 m, Sept 1, 1944, Steyermarlc 

 58175 (F, VEN); summit Cerro Duida, alt. 1025-1200 m, Sept 2, 1944, Steyermarlc 58249 (F, 

 NY, VEN). Known only from Cerro Duida. 



2. Amphiphyllum schomburgkii Maguire, sp. nov. 



Herbae perennes; foliis gladiatis, laminis 60-70 cm longis, 2.5-3.0 cm latis, 

 moderate nervatis, apicibus acutis; vaginis non visis; scapis evidenter pluribus, 

 angulato-sulcatis, 2.0-2.5 mm diam., superne expansis compressis, 4—6 mm latis ; 

 capitulis vulgo 6-8-floris; bracteis primariis duobus, induratis, exteriore late 

 orbiculari, obovata, ca. 2 cm longa, interiore obovata, angustiore, partim amplec- 

 tanti exteriorim ; bracteis secondares delicatis membranaceis 2-3-floris vaginatis ; 

 bracteis tertiariis similibus, acutis, 15-18 mm longis, flore quoque a bractea sub- 

 tento et vaginato; spiculis 6-8, sessilibus, 14—15 mm longis, sepalis exclusis; 

 bracteolis 5-6-seriatis gradatis, lanceolatis induratis acutis, enervatis, conspicue 

 scario-marginatis ; sepalis induratis, lanceolatis acutis, exsertis, ca. 15 mm longis, 

 ca. 5 mm latis ; petalis non bene visis ; antheris ca. 9 mm longis, 4-thecatis; se- 

 minibus ignotis. 



Type: E. H. Schomburgk 1055, without definite locality (holotype BM, iso- 

 types K, NY). Known only by the type collection. 



Robert^Schomburgk's mss. field notes (preserved at Kew, typescript copy at 

 New York) end with No. 1054 which was collected "on moist savannas near 

 Roraima. " It does not necessarily follow that No. 1055, the type of Amphiph ///- 

 lum schomburgkii was obtained at the locality of 1054, since the order of Schom- 

 burgk 's numbered series is not always in chronological or geographical sequence. 

 1 strongly suspect that 1055 was collected on or near Cerro Marahuaca, in Ama- 

 zonian Venezuela. Its only congener, A. rigidum Gleason, is known solely from 

 the nearby Cerro Duida. It would seem reasonable to assume that if this plant 

 had been collected in the environs of Roraima it should have been rediscovered 

 by some of the many subsequent botanical visitors to that region. 



4. Stegolepis Klotzsch ex Kornicke, Linnaea 37: 480. 1872. 



The genus Stegolepis, like Rapatea, has evolved perhaps 20 species. But un- 

 like the latter, which has a broad distribution chiefly extra-Guayanan and at low 



