1960] 



BOTANY OF THE GUAYANA HIGHLAND PART IV 



lit 



This species differs from the closely related P. wurdackii in its completely 

 lepidote leaf-blades and subsessile flowers, 



Brocchinia delicatula L. B. Smith, sp. nov. Fig. 6. 



Florifera 20-35 cm alta ; caule erecto, 3 cm vel altiore, 8 mm diametro, basi- 

 bus vetustis atris foliornm dense vestito ; foliis apice caulis rosulatis, ad 16 cm 

 longis, dissite adpresseque lepidotis, vaginis latissime ovatis, 1 cm longis, atro- 

 castaneis, sublueidis, laminis linearibus, acuminatis, 4 mm latis, planis, dense 

 nervatis, pallide viridibus, integris; scapo erecto, gracillimo, glabro ; scapi 

 bracteis erectis, remotis, parvis, anguste triangnlaribus, dissite lepidotis; inflor- 

 escentia laxe bipinnatim paniculata, 5-13 cm longa, glabra; bracteis primariis 

 eis scapi similibus, quam basibns sterilibns nudis ramornm brevioribus ; ramis 

 divergentibus, 3-5 cm longis, gracillimis, laxe pancifloris; bracteis florigeris 

 ovatis, acutis, 2.5 mm longis, membranaceis ; floribns divergentibus, breviter 

 pedicellatis ; sepalis oblongis, obtusis, 2.5 mm longis, membranaceis, stramineis; 

 petalis oblongis, obtusis, 3.5 mm longis, hand nngnicnlatis, albis; staminibns 

 inclnsis, filamentis cum sepalis petalisqne brevissime eoalitis; ovario clavato, 

 5 mm longo, minime supero, stylis distinct is, gracilibus. 



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

 in rock crevices along Canon Grande east of Cumbre Camp, 24 Nov 1957, B. Maguire, J. J. 

 Wurdaclc $ C. K. Maguire 42207 (type). 



This species is by far the smallest and most delicate in Brocchinia and is 

 easily distinguished by its habit alone. It belongs with the species with promi- 

 nently nerved leaf-blades and glabrous inflorescences but does not appear closely 

 related to any of them. 



Navia diffusa L. B. Smith, sp. nov. Fig. 7. 



Florifera ad 3 m alta; foliis interioribus solum cognitis, ad 4 dm longis, sub- 

 dense serrulatis, supra glabris, vaginis late ovatis, ca. 4 cm longis, brunneis, 

 subtns lepidibns albidis orbicularibus adpressis subdense vestitis, laminis anguste 

 triangnlaribus, nullo modo contractis, 27 mm latis, snbtus obscure dissiteque 

 lepidotis ; scapo 2 cm diametro ; scapi bracteis erectis, foliaceis, dense imbricatis ; 

 infloresi entia laxissime 3-4-pinnatim paniculata, glabra ; bracteis primariis late 

 ovatis, acuminatis, quam basibus sterilibus ramornm brevioribus, infimis serru- 

 latis ; ramis ad 28 cm longis ; bracteis florigeris latissime ovatis, quam sepalis 

 subduplo brevioribus; floribns patentibus, sessilibus; sepalis liberis, cochleari- 

 imbricatis, late ovatis, obtnsis, 4 mm longis; petalis juvenilibus solum cognitis, 

 inclnsis; ovario supero. 



A'ENEZUELA : Amazonas: Cerro de la Neblina, Eio Yatua, alt. 1900 m, frequent on edge 

 of north escarpment, 23 Dec 1957, B. Maguire, J. J. Wurdaclc <$- C. K. Maguire 42537-E (type). 



Figs. 2, 3. Cottendorfia. Fig. 2. C. nubigena (Maguire, Wurdaclc 4' Maguire 42151). a, 

 base of leaf, X 0.5 ; b, branch of inflorescence, X 0.5 ; c, flower, X 1 ; d, sepal, X 2. Fig. 3. 

 C. savannensis (Maguire, Wurdaclc 4' Maguire 42167). a, base of leaf, X 0.5; b, branch, X 0.5; 

 c, flower, X 1 ; d, sepal, X 2. Figs. 4, 5. Pitcairnia. Fig. 4. P. wurdachii (Maguire, Wurdaclc 

 4' Maguire 41584). a, base of leaf, X 1 ; b, flower, X 1 ; c, sepal expanded, X 1 ; d, ovary, X 1 ; 

 e, seed, X 5. Fig. 5. P. maguirei (Maguire,, Wurdaclc Keith 41556). a, base of leaf, X 1; 

 b, flower, X 1 ; <N sepal expanded, X 1 ; d, ovary, X 1 ; e, seed, X 5. 



