24 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[voA 10 



1. Bractlets of the spikelets spathulate-oblanceolate, subsqual in length, hence non- 

 gradate; mature heads smaller, 3 cm or less broad; plants of lowland habitats 

 (subg. Acrotheca Korn.). 

 7. Leaf margins (and petioles) entire. 



8. Caudex free of marcescent leaf -shea ths ; petioles lacking or shorter than the 

 blade, the blades not subsucculent, obviously veined ; bracteoles ca. 16, 8-9 mm 

 long; sepals 11-12 mm long, not strongly bilaterally asymmetrical; ovary 4 mm 

 long, the locules 6-ovuled. 6. 8. inn-mis. 



8. Caudex fibrous with marcescent leaf -sheaths ; petioles conspicuously longer than 



blades, the blades subsucculent, not obviously veined; bracteoles 20-22, 9-10 

 mm long, not conspicuously scarious-margined ; sepals 14—15 mm long, strongly 

 bilaterally asymmetrical; ovary 5 mm long, the ovules 6-10 per locule. 



7. 8, petiolatfl. 



7. Leaf and petiole margins dentate-spinulose. 



9. Base of the blades acutely narrowed into the petiole; margins of the blades more 



or less conspicuously dentate-spinulose. 8. S. aouleata 



9. Base of the blades subcordate or abruptly contracted into the petiole; margins 

 of the blades usually less conspicuously spinulose, or one or both margins entire. 



9. 8. suboordata. 



1. Saxofridericia regalis Rob. Sehomb. Rapatra Frid. Aug. Saxo-Frid. Reg. 14. 



1845. 



Bajyatea viscosa Gleason, Bull. Torrey Club 56: 18. 1929. 



Type: "Wachst auf sumpfigen Savannen in der Nahe des Sandsteingebirges 

 der Koraima [Venezuela] 4000-5600 Fus iiber dem Meere," Rob. Schomburgk 

 2038 (holotype, K). 



Distribution: Freqeunt, savannas and open scrub slopes on sandy soil over- 

 lying Roraima sediments; Gran Sabana. Edo. Bolivar. Venezuela; Ayanaranna, 

 Imbaimadai, and Kaieteur Savannas, Pakaraima Region British Guiana; Tafel- 

 berf, Suriname. 



2. Saxofridericia duidae Maguire, sp. nov. 



Herbae magnae perennes; eaulibus perbrevibus crassis percarnosis 1-2 dm 

 altis ereetis vel adscendentibus ; foliis nonnullis, 10-20 dm longis; vaginis 20-30 

 cm longis, 3 em latis, conduplicatis equitantibus distiehisque induratis lanceolatis 

 dorso carinatis laminarum marginibus continuis; laminis 8-18 dm longis, 2.0-3.5 

 em latis, gladiatis falcato-acuminatis, ad basim longe et anguste attenuatis, supra 

 nervis prominulis, subtus nervis ca. 20, plus-minusve prominentibus ; costa valde 

 prominenti ; pedunculo solitario pseudosubterminali 6-10 dm longo et ad apicem 

 dilatato; inflorescentia globosa, 4.5-5.5 cm diam; bracteis involucralibus 2, bival- 

 vatis, brevicaudatis, 3-5 cm longis, brevi tempore ruptilibus, in maturitate non- 

 visis ; spiculfs numerosis sessilibus, 18-23 mm longis, in sepalis inclusis ; bracteolis 

 ea. 20, valde gradatis, inferioribus lanceolatis, ca. 6 mm longis, acutis 1-nervatis. 

 superioribus lanceolatis pungentiacuminatis 7-9 nervis, apice rigido; sepalis lib- 

 eris, 15-16 mm longis, lanceolatis acuminatis rigidis induratis 7-9-venatis, ad ba- 

 sim membranaceis; petalis obovatis apiculatis unguibus sparse pilosis (maturis 

 non visis) ; filamentis membranaceis partibus liberis sursum, ca. 3 mm longis, 0.7- 

 0.8 mm latis, 1-nervatis; antheris lanceolatis, ca. 6 mm longis, 4-lobatis 4-thecatis. 

 thecis anterioribus ca. 5 mm longis, apice loborum posteriorum in appendice acu- 

 minato 1 mm longo producto; ovario triloculari, loculis pluriovulatis, nee capsulis 

 nec seminibus visis. 



Saxofridericia duidae subsp. duidae. 



Spiculae 20-22 mm longae ; mensura maxima bracteolarum 5 X 14 mm, acu- 

 mine ca. 0.5 mm longo, nervis 7, inconspicuis. 



