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BOTANICAL EXPLORATION IN VENEZUELA - I 147
minuteque serrulatis, supra glabris, subtus dissite piloso-lepidotis
mox glabris, utrinque viridibus; inflorescentia dense capituliforme,
in foliorum centre nidulante, 15 mm. diametro; bracteis florigeris
lanceolatis, sepala superantibus, ad apicem versus serrulatis; floribus
sessilibus; sepalis liberis, 13 mm. longis, oblongo-lanceolatis,
acutis, glabris, posticis carinatis; petalis ad 21 mm. longis, albis;
staminibus styloque inclusis (Fig. 21,f-h).
Type collected on moist southeastern-facing sandstone bluffs near
Cano Negro (tributary of Canb Iguapo), Cerro Duida, Territorio
Federal Amazonas, alt. 1095-1520 m., August 26, 1944, Julian A.
Steyermark 58012.
Navia xy rid iflore L. B. Smith, sp. nov.
Aggregata, caulescens; caule robusto, ukra 1 dm. longo; foliis
caulem dense quaquaverse vestientibus, persistentibus, patentibus,
vaginis brevibus, omnino occultatis, laminis linearibus, acuminatis,
ad 19 cm. longis, 16 mm. latis, dense minuteque serrulatis, supra
glabris viridibusque, subtus griseis, dissite minuteque punctulatolepidotis;
inflorescentia dense capituliforme, in foliorum centro nidulante,
pauciflora; bracteis florigeris ellipticis, apiculatis, sepala
superantibus, coriaceis, brunneis, apice lepidotis; floribus sessilibus;
sepalis liberis, posticis spathulatis, 11 mm. longis, ad apicem
versus valde alatis et lepidotis; petalis albis, delapsis solum
cognitis (Fig. 21, i-j).
Type collected on dry slopes, Brocchinia Hills, Cerro Duida,
Territorio Federal Amazonas, alt. 1700-1980 m., September l f 1944,
Julian A t
Steyermark 58152. In habk, Navia xyridiflora appears
practically identical with N. angustifolia except for a slightly more
even upper leaf-surface, yet the sepals show die strongest contrast
in the genus. In N. xyridiflora they are strongly heteromorphic with
the posterior ones spatulate and broadly alate, while in N. angustifolia
they are all lance-oblong and not at all alate.
The following key shows how the above novelties are distinguished
from previously known members of Navia:
1. Inflorescence elongate, interrupted N caulescens.
1. Inflorescence densely capitate or glomerate.
2. Leaf-blades 12-19 mm. broad, densely serrulate.
3. Inflorescence distinctly scapose, glomerate from several heads;
leaf-blades densely white-lanate beneath; sepals 5.5 mm. long.
N. bicolor.
3. Inflorescence sessile, capitate; leaf-blades glabrous or sparsely
and obscurely punctulate-lepidote beneath; sepals 11-19
mm. long.
4. Sepals to 19 mm. long, lance-oblong, subsimilar, not dilated
toward apex
N. angustifolia.