1958] 



THE BOTANY OF THE GUAYANA HIGHLAND PART III 



47 



1. Monotrema aemulans Kornieke, Linnaea 37: 477. 1873. 

 Stegolepis aemulans (Korn.) Benth. & Hook. Gen. PL 3: 859. 1883. 



Type : ad flumen Casiquiare, Vasiva et Paeimoni, in silvarum aquosis [Ama- 

 zonas, Venezuela], Jan [18] 53, R. Spruce 3292 (holotype M, isotypes BR, K, 

 NY, photo G). 



Distribution : Sandy, periodically wet open or brush savannas of the Upper 

 Rios Orinoco and Negro, Amazonian Venezuela, and Brazil. 



2. Monotrema arthrophyllum (Seub.) Maguire, comb. nov. 



Schoenocephalium arthrophyllum Seubert in Mart. Fl. Bras. 3 1 : 131. 1847. 



Type : in petrosis grammosis umbrosis montis Arara-Coara, Rio Caqueta. Co- 

 lombia, Jan 1820, Martins 3164A I holotype M). Two specimens at Munich repre- 

 sent the type and isotype respectively, the first named and signed by Seubert, 

 with an appended ticket bearing- the number 1039 ; the second with a ticket 

 number 1040. 



Distribution: A^aracuara, Rio Caqueta, Colombia, known certainly only from 

 the type locality. Probably a depauperate form of the preceding. 



3. Monotrema xyridoides Gleason, Bull. Torrey Club 58: 332. 1931. 



Type: east swamp, Esmeralda, Amazonas, Venezuela, alt. 32.") ft., Oct 19, 

 1928, Tate 245 (holotype XY, isotype US). 



Distribution : Wet, mostly open savannas of Upper Rio Orinoco, the Rios 

 Ventuari, Atabapo and Guainia, Amazonia Venezuela, and adjacent Colombia. 



4. Monotrema bracteatum Maguire, sp. nov. Figure 7. 



Herbae terrestres perennes, eaudice erecto, 2-4 cm alto; foliis 4-6 in quoque 

 tempore, 25-45 cm loiuris; vaginis ad basim 10-15 mm latis, 6-10 cm longis, nec 

 equitantibus nec distiche dispositis; laminis 20-35 cm longis, 3-7 mm latis gra- 

 mineis glabris, 5-9-nervatis ; foliis veteribus marcescentibus ; pedunculis 1-5, 

 25-50 cm longis. ca. 1.0-1.5 mm latis. 4-5-angnlatis costatisque; capitulis soli- 

 tariis; bracteis primariis 2-3 cm longis. ad basim 6-8 mm latis, laneeolato-aeumi- 

 natis, albidis aliquantum viridibus, 9-11-nervatis ; bracteis secondariis numerosis 

 i a. 25. supra g-radatim parvioribus. quoque spiculam subtendenti, albidis; spiculis 

 8-10 mm longis, bracteolis ferme 5, anguste lanceolatis, acutis, 6-10 mm longis, 

 exterioribus lomnoribus ; sepalis 3, lanceolatis, 6-7 mm longis, 2 mm latis, acutis ; 

 petalis 3. flavidis. unguibus ca. 3 mm longis. ca. 1.5 mm latis, laminis oblongo- 

 lanceolatis, 4-5 mm longis. 1.5-2.0 mm latis; staminibus 6; filamentis liberis, ca. 

 4 mm longis; antheris 3.0-3.5 mm longis, ad basim 4-thecatis. uniporis, poro 

 oblique apicali ; ovario angulari-ovato-pyriformi, apice minute 3-lobulato, 3.0-3.5 

 mm lonQ'o, 3-ovulato ; seminibus, appendice inclusa, 2 mm longis, ovalis minute 

 muriculatis. 



Type : herbaceous perennial 30-60 cm high, outer bracts green, inner white, 

 petals vale yellow, frequent in partially open scrub savanna. Yapacana Savanna 

 TT. at 150 m alt., Rio Orinoco. Terr. Amazonas, Venezuela. Xov 20, 1953, Maguire, 

 Wurddck $ Bunting 36624 (holotype NY). 



Pjvntypes: Yapacana Savannas: herb to 4 dm high, multibracteate, outermost bracts 

 white, floAvers pale yellow, scrub savanna, Savanna I. Dec 31, 1950. Maguire, Cowan <$• TTurdael- 

 30461 ; herbaceous perennial with white bracts arid pale yellow flowers, open woodland near 

 Savanna III, March 17, 1953, Maguire <f Wurdack 34534 ; perennial herb, polybracteate, outer- 

 most green, inner white, bracteoles white, flowers pale yellow, in open T.erminalia society, 

 Savanna III, Dec 31, 1950, Maguire, Couan <$• Wurdaclc 30490; Savanna I, March 17, 1953, 

 Maguire $• WurdacV 34510; frequent, sparse bush, Savanna III, Nov 20, 1953, Maguire, Wur- 



