40 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



Wurdack 4' Bunting 37631; Sabana de Mayo on south bank of Rio Ventuari, 15 km above 

 mouth, at 150 m alt., May 5, 1954, J. Silverio Level 39; San Antonio, Upper Orinoco, Feb 

 1-20, 1931, Holt 4- Blake 698 (US). 



5. Schoenocephalium schultesii Maguire, sp. nov. 



Herbae terrestres perennes 10-14 dm altae, caudice brevissimo erecto vaginis 

 aliquantum compressis; foliis 3^, 7-9 dm longis; vaginis 15-20 cm longis, 1.8-2.4 

 cm latis eonduplicatis, compressis distichis equitantibusque, subinduratis, margi- 

 nibus conspicue scariosis, ad basim dilatis; laminis linearibus, 50-70 cm longis, 

 15-20 mm latis, nervis a ca. 0.5 mm separatis, apicibus tennis acutis aliquantnm 

 falcatis; pednnculo solitario val aliquantum 2, 12-16 dm longo, improminenter 

 nervato, unicapitatis ad apicem aliquantum compresso, dilatato, ca. 1 cm lato; 

 capitulo sphaerico, ca. 4.5 cm diam. ; bracteis involucralibus 2, lanceolatis, ca. 2 

 cm longis, demum deflexis; spiculis 60-80, radiatis acutis, 18-20 mm longis, 

 sessilibus ; bracteolis 13-15, gradatis, 4—16 mm longis, obtusis, debile 3-5-nervatis, 

 aliquantum concavis, inferioribus ovatis vel oblongo-ovatis, super ioribus oblongo- 

 lanceolatis; sepalis lanceolatis, 17-19 mm longis, ca. 6 mm latis, acutis, navicu- 

 loideis, subinduratis ; petalis lanceolatis ca. 12 mm longis sagittato-lonceolatis, 

 4-5 mm latis, minute maculatis, ad basim in tubo brevi 'connatis ; staminibus 6, 

 inclusis; filamentis ad basim in tubo brevi connatis, partibus liberis 1-2 mm 

 longis; antheris ca. 5 mm longis, 4-thecatis, minute furfuraceo-papillatis, ad 

 apicem 4-poris ; ovario 3-loculari ; ovulis 4 in quoque loculo ; stylis teretibus, 9-10 

 mm longis, ad apicem brevissimis circumciliatis ; seminibus subprismaticis, ca. 

 1.5-2.0 mm longis, striatis, rubellis. 



Type : herb 1 m or more tall, bracteoles red, sepals white, Cerro Isibukur'i, 

 Rio Kananari (affluent Rio Apaporis), Vaupes, Colombia, Oct 29, 1951, Schultes 

 & Cabrera 14506 (holotype NY) . 



Paratypes: Cerro Isibukuri, Rio Kananari (affluent Rio Apaporis), Vaupes, Colombia, Oct 

 29, 1951, Schultes $ Cabrera 14501; same locality, Jan 23-25, 1952, Schultes # Cabrera 15076 

 (US). 



Rapateoideae, Rapateeae 



9. Rapatea Aublet, Hist. PI. Gui. Franc. 1: 305. pi. 118. 1775. 



A genus of perhaps 20 species of wide distribution, chiefly at low elevations, 

 in tropical South America. Taxonomic consideration of Rapatea is to be given 

 in a forthcoming issue of the Memoirs. 



10. Cephalostemon Rob. Schomburgk, Bapatea Frid. Aug. Saxo-Frid. Reg. 9. 



1845'. 



Bracts linear-lanceolate, conspicuous ; bractlets setiform ; petals yellow, obcor- 

 date-obovate, retusely apiculate; anthers 4-celled, the posterior lobes dehiscing 

 by a longitudinal subterminal introrse slit extending to the apex of the anterior 

 lobes; capsule globose, trilocular, the locules uniovulate; seed elliptic-oblong, 

 non-striate, subsessile and subbassally attached, the summit shallowly concave and 

 centrally apiculate, surmounted by a dense white mitriform papillate mass. 



Type: Cephalostemon gracilis (Poepp. et Endl.) Rob. Schomb. 



i 



Key to the Species of Cephalostemon 



1. Outer bractlets setose. 

 2. Setae clavate. 



3. Outer bractlets weakly nerved, non-glaucous, non-punctate; plants of marshy 



savannas, Amazonas, Venezuela, and Suriname. 2. C. affinis. 



