1960] 



BOTAXY OF THE GUAYANA HIGHLAND PART IV 



21 



In my key in the previous report (Mem. N. Y. Bot. Gard. 9: 295), this 

 species runs down to the vicinity of N. brocchinioides but is quickly distin- 

 guished by its short pinnately arranged spikes. 



Navia abysmophila L. B. Smith, sp. nov. Fig. 8. 



Acaulis vel breviter caulescens; caule ad 10 cm longo, pauciramoso, 5 mm 

 diametro, mox nudo; foliis multis, apice caulis densissime aggregatis, ad 6 cm 

 longis, interioribus aream coloratam circa inflorescentiam haud formantibus, 

 vaginis integris, infimis subtriangularibus, parvis, supremis suboblongis, ca. 1 

 cm longis, laminis linearibus, acuminatis, 3.5 mm latis, basi haud contractis, 

 subtus valde nervatis cretaceisque, mox utrinque glabris, spinis minutis subdense 

 serrulatis ; inflorescentia subsessile, simplici, pauciflora, 5 mm diametro ; bracteis 

 exterioribus subfoliaceis sed valde reductis; bracteis florigeris late ellipticis, 

 acutis mucronulatisque, 8 mm longis, omnino membranaceis, pallide brunneis, 

 lepidibus minutis linearibus pallidis sparsissime vestitis ; sepalis oblongis, obtusis 

 cucullatisque, 7 mm longis, posterioribus anguste alato-carinatis ; petalis albis ; 

 staminibus inclusis; ovario supero. 



VENEZUELA: Amazonas: Cerro de la Neblina, Rio Yatua, alt. 1100 m, locally frequent 

 on rocks in bottom of Canon Grande south-southwest of Cumbre Camp, 24 Dec 1957, B. 

 Maguire, J. J. WurdacTc 4" C. K. Maguire 42471 (type). The species is also represented by 

 number 42202 from east of Cumbre Camp. 



This novelty closely resembles Navia cu cull at a but differs in having the 

 young leaves cretaceous beneath and the floral bracts acute and uniformly 

 membranaceous. 



Navia affinis L. B. Smith, sp. nov. Fig. 9. 



Caulescens; caule erecto, simplici, ad 12 cm alto, 7 mm diametro, foliorum 

 vaginis vetustis praeditis; foliis juvenilibus terminalibus, subpetiolatis, ad 3 dm 

 longis, apice obscure serrulato excepto integris, vaginis triangularibus, 3-4 cm 

 longis, ex sicco rubentibus, margine villoso-lepidotis, laminis lineari-lanceolatis, 

 acuminatis, 10 mm latis, marginibus paulo incrassatis; inflorescentia in centro 

 foliorum sessili, ellipsoidea, 20 mm longa, 6 mm diametro, verisimiliter simplici ; 

 bracteis ellipticis, ca. 15 mm longis, sepala superantibus, subtenuibus, apice 

 paulo incrassatis rubentibusque, dissite lepidotis, integri, laevibus; sepalis ob- 

 longis, obtusis, 12 mm longis, tenuibus, V2 connatis; petalis albis, reflexis et 

 stamina nudantibus ; ovario supero. 



VENEZUELA: Amazonas: Cerro de la Neblina, Rio Yatua, alt. 1100 m, locally frequent 

 on rocks in bottom of Canon Grande south-southwest of Cumbre Camp, 24 Dec 1957, B. Ma- 

 guire, J. J. WurdacTc $ C. E. Maguire 42470 (type). 



Fig. 6. Brocchinia delicatula (Maguire, WurdacTc 4' Maguire 42207). a, habit, X 0.5; b, 

 branch of inflorescence, X 1 ; c, sepal and stamen, X 5 ; d, petal and stamen, X 5 ; e, ovary, X 

 5. Figs. 7-10. Navia. Fig. 7. N. diffusa (Maguire, WurdacTc & Maguire 42537-E). a, base of 

 leaf, X 0.5: b. br^rch of irfloroscerc". X 0.5; c, flower, X 1: sepal expanded, X 5. FlG. 8. 

 N. abysmophila (Maguire, WurdacTc $ Maguire 42471). a, habit, X 0.5; b, inflorescence, X 1; 

 c, sepal, X 1- Fig. 9. N. affinis (Maguire, WurdacTc 4" Maguire 42470). a, leaf, X 0.5; b, 

 flower, X 1- Fig. 10. X. parvula var. expansa (Maguire, WurdacTc -4' Maguire 42246). a, 

 inflorescence, X 0.5; b, flower, X 1. 



