2957] 



THE BOTANY OF THE GUAYANA HIGHLAND— PART II 



309 



22. Navia cucullata L. 3. Smith, sp. nov. Fig. 46. 



Verisimiliter caulescens; foliis multis, apice caulis densissime aggregatis 9 ad 

 9 cm longis, axillis spinarum infimarum barbellatis exceptis glabris, foliis inte- 

 rioribus cum bracteis basi albis et aream coloratam magnam circa inflorescentiam 

 formantibusj vaginis reniformibus, 15 mm latis, atro-brunneis, laminis linearibus. 

 acuminatis, rigidis pungentibusque, 5-6 mm latis, basi paulo attenuates, subtus 

 valde nervatis, spinis minutis subdense serrulatis; scapo brevi, nudo; inflores- 

 centia simplici. pauciflora, 8 mm diametro, glabra; bracteis exterioribus subfolia- 

 ceis sed valde reductis; bracteis florigeris ellipticis. obtusis, integris. apice 

 incrassatis, quam sepalis brevioribus; sepalis liberis, sublinearibus. cucullatis, 

 9 mm longis, posterioribus basi anguste alato-carinatis; petalis albis (! Maguire); 

 ovario supero. 



TYPE: frequent on rocks near cumbre camp at 2000 m alt., Cerro Guaiquinima, 

 Rio Paragua. Bolivar, Venezuela, December 25, 1951, B. Maguire 32766. 



The species is also represented by number 32824 from rocks in open savannas 1 km 

 south of cumbre camp at 1800 m and by number 33098, a form with slightly broader leaves 

 from a cliff face at waterfalls, North Valley, 1600-1700 m, both from the same region as 

 the type. 



23. Navia umbratilis L. B. Smith, sp. nov. Fig. 47. 



Imperfecte solum cognita, verisimiliter caulescens; foliis multis, vaginis late 

 ovatis. ca. 25 mm longis. pallide brunneis, margine late hyalinis, laminis lineari- 

 bus, acuminatis^ basi haud attenuatis, ad 16 cm longis. 5 mm latis, supra glabris, 

 subtus dense adpresseque cinereo-lepidotis. anguste cartilagineo-marginata, basi 

 laxe minuteque serrulata; inflorescentia nidulante, simplici, subglobosa, 1 cm 

 diametro; bracteis exterioribus foliaceis sed reductis; bracteis florigeris ellipti- 

 cis, late obtusis apiculatisque, sepala subaequantibus, integris, plus minusve 

 cucullatis, tenuibus. cinereo-lepidotis; sepalis liberis, 12 mm longis, anguste 

 lanceolatis, anteriore obtuso, posterioribus carinatis, valde cucullatis, tenuibus, 

 glabris; petalis staminibusque ignotis; ovario supero; capsula ellipsoidea, 6 mm 

 longa; seminibus nudis vel alis minimis deciduis praeditis. 



TYPE: terrestrial herb, shade form with leaves more slender and without white 

 bases, common near seepage at 200 m up left branch of Cano Yutaje at 1200 m 

 alt., Serrania Yutaje, Rio Manapiare, Amazonas, Venezuela, February 25, 1953, 

 B. & C. K. Maguire 35406. 



24. Navia semiserrata L. B. Smith, sp. nov. Fig. 48. 



Humilis, pulvinata; caule ramoso, basibus foliorum vetustorum dense obtecto; 

 foliis vivis multis, in apicibus caulis rosulatis, vaginis parvis, late ovatis, atro- 

 castaneis, glabris, laminis linearibus, acuminatis, 6-7 cm longis, 3-4 mm latis, 

 subtus adpresse albo-lepidotis, mox glabris, parte basali dense minuteque serru- 

 lata, parte apicali integra; scapo brevi, nuda; inflorescentia e centro foliorum ex- 

 serta, globosa, 14 mm diametro; bracteis exterioribus foliaceis sed valde re- 

 ductis; bracteis florigeris ovatis, sepala paulo superantibus, integris, tenuibus, 

 apice abrupte acutis incrassatisque, dissite albo-lepidotis; pedicellis brevibus; 

 sepalis liberis, lanceolatis, apice abrupte inflexis, 8 mm longis, glabris, poste- 

 rioribus anguste alato-carinatis; petalis albis; staminibus inclusis; ovario supero. 



TYPE: flowers white, frequent, dominant cumbre rock cover, cushions to 3 n 

 diameter, Cerro Moriche at 1250 m alt., Rio Ventuari, Amazonas, Venezuela, Jan- 

 uary 15, 1951, B. Maguire, R. S. Cowan & J. J. Wurdack 30959. 



Number 30863 is the same species: flowers white, frequent on rocks, upper cliffs at 

 1000 m alt., Cerro Moriche. 



