38 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 10 



mouth), alt. 600-700 m, Amazonas, Venezuela, 21 Jul 1959, J. J. Wurdack & 

 L. S. Adderley 43565 (holotype US). 



This variety differs from variety macrantha in its completely serrulate leaf- 

 blades. 



Navia barbellata L. B. Smith, sp. nov. Fig. 24, a-d. 



Humilis; caule simplici, erecto vel adscendenti, ultra 25 em longo, basibus 

 f oliorum vetustorum dense vestito ; foliis vivis plurimis, apice caulis rosulatis, 

 patentibus, 20 cm longis, fragilis, vaginis late ovatis, brevibus, integris, laminis 

 ligulatis, acuminatis pungentibusque, basi paulo contractis, ad 18 mm latis, dense 

 rubro-serrulatis, in axillis spinarum albo-barbellatis, alibi glabris, supra basin 

 versus linea mediana pallida pictis ; scapo gracili, 1 cm longo ; inflorescentia 

 simplici, subglobosa, pauciflora ; bracteis norigeris exterioribus subfoliaceis, flores 

 multo superantibus, interioribus acutis, integris, glabris, sepala subaequantibus ; 

 sepalis liberis, lanceolatis, obtusis cucullatisque, 20 mm longis, aurantiacis, poste- 

 rioribus anguste alato-carinatis; petalis pallido-flavis ( ! Tillett). 



Type. Upper Mazaruni River Basin, Kako River, British Guiana, alt. ca 

 1220 m ; leaves medium green with red spines and white hairs along margin, very 

 stiff and brittle ; bracts of inflorescence orange-red ; perianth yellowish- white ; 

 locally dominant on vertical cliff faces, main peak of Karowtipu, 29 Sep 1960, 

 8. S. d' C. L. Tillett 45557 (holotype NY). 



Because of its blunt cucullate sepals Navia farinacea appears to be related to 

 N. latifolia L. B. Smith, but its leaves are glabrous except for the barbellate 

 spine-axils instead of being cretaceous beneath like the latter. 



Navia gracilis L. B. Smith, sp. nov. Fig. 27, a-d. 



Florif era ad 2 m alta ; foliis ad 75 cm longis, vaginis quam laminis laevioribus 

 et brunneo coloratis sed latitudine vix distinctis, parvis, subinermibus, dissite 

 obscureque lepidotis, laminis linearibus, acuminatis, pungentibus, 2 cm latis, 

 tenuiter denseque nervatis, basi excepta subtus glabris, supra adpresse cinereo- 

 lepidotis, spinis atris sursum curvatis 2 mm longis laxe armatis; scapo erecto, 

 basi 15 mm diametro, glabro, dense minuteque rubro-maculato ; scapi bracteis 

 erectis, serrulatis, infimis subfoliaceis, internodia multo superantibus, supremis 

 late triangularibus, parvis, quam internodiis multo brevioribus; inflorescentia 

 ample laxeque tripinnatim paniculata, glabra ; axi recto ; bracteis primariis 

 suprenris scapi similibus, quam basibus sterilibus ramorum multo brevioribus; 

 ramis subpatentibus ad 28 cm longis apice divisis, e basi 2/3 sterilibus ; bracteis 

 secundariis eis norigeris similibus ; spicis gracilibus, leviter arcuatis, cylindricis, 

 breviter stipitatis, 4-9 cm longis, 1 cm diametro, basi excepta densis, multifloris ; 

 bracteis florigeris erectis, latissime ovatis, apiculatis, 5 mm longis, sepala sub- 

 aequantibus, pallidis, rubro-punctatis, crassis, verisimiliter carnosis, hyalino- 

 marginatis ; floribus subsessilibus ; sepalis liberis, late ellipticis, subobtusis, 5 mm 

 longis, posterioribus late alato-carinatis; petalis late rotundatis, 7 mm longis, 

 albis, ex sicco flavis ; staminibus inclusis ; ovario omnino supero. 



Type. Terrestrial, frequent in sabanita 1 km east of Maroa, Rio Guainia, alt. 

 130 m, Amazonas, Venezuela, 1 Jul 1959, J. J. Wurdack d' L. S. Adderley 43275 

 (holotype US). 



This species is closely related to N. hohenbergioides but differs in its more 

 slender spikes, smaller flowers, and densely lepidote upper surface of the leaves 

 and scape-bracts. 



