2957] 



THE BOTANY OF THE GUAYANA HIGHLAND— PART II 



295 



Navia 



1. Inflorescence laxly racemose or paniculate. 

 2. Flowering shoot less than 3 dm high. 



3. Inflorescence compound, much shorter than the 34-cm-long leaves. 



1. N. lindmanioides . 



3. Inflorescence simple, exceeding the 13-cm-long leaves. 2. N. fluviatilis. 

 2. Flowering shoot 8-50 dm high. 



4. Ovary wholly superior; flowers and branches divergent to spreading. 

 5. Spikes densely strobilate, 7 cm long including the sterile base. 



3. N. hohenbergioides. 

 5. Spikes not strobilate, to 26 cm long; flowers spreading, not contiguous. 

 6. Sepals 2-3.5 mm long. 



7. Plant 5 m high; posterior sepals carinate. 4. N. brocchinioides. 



7. Plant not much if any over 1 m high; sepals ecarinate. Colombia: 



Caqueta. N. garcia-barrigae. 



6. Sepals 10 mm long, the posterior ones alate-carinate. 5. N. hechtioides. 



4. Ovary % inferior; flowers reflexed; ultimate branches pendent. Colombia: 



Vaupes. N. re flex a. 



1. Inflorescence glomerate or moniliform-glomerate. 



8. Inflorescence elongate, moniliform from several heads. Colombia: Araracoara. 



N. caulescens. 



8. Inflorescence simple, glomerate from a single head, or several digitately ar- 

 ranged spikes. 

 9. Ovary superior. 

 10. Sepals free. 



11. Sepals 50 mm long; petals rose-purple in the typical variety; leaves 



entire, 23 mm wide. Eastern Colombia, Amazonian Brazil. N. lopezii. 



11. Sepals not more than 30 mm long; petals white or yellow so far as 

 known; leaves mostly serrulate. 

 •12. Sepals acute or acuminate, sometimes incurved but never cucullate. 

 13. Sepals 22-30 mm long; petals yellow, showy; floral bracts entire 



or obscurely serrulate. 6. N. wurdackii. 



13. Sepals less than 22 mm long. 



14. Floral bracts serrulate or denticulate. 



15. Axils of the leaf-spines conspicuously and persistently bar- 

 bellate; floral bracts strongly serrate, red; sepals acumi- 

 nate; inflorescence broadly hemispheric, 3-4 cm in diameter. 

 16. Sepals appressed-lepidote; leaf-blades 30 mm wide. 



7. N. stenodonta. 



16. Sepals sparsely tomentose with linear white trichomes; 



leaf-blades 6 mm wide. 8. N. tricbodonta. 



15. Axils of the leaf-spines not much more tomentose than the 

 remainder of the blade. 



17. Leaf-blades 8-15 mm wide; inflorescence not obviously 



scapose. 



18. Sepals 8 mm long; floral bracts recurving; inflorescence 



green. 9. N. viridis. 



18. Sepals 12-18 mm long; floral bracts straight. 



19. Inflorescence 15 mm in diameter, green. Venezuela: 



Duida. N. steyermarkii. 



19. Inflorescence 40-50 mm in diameter, pink to red. 



10. N. phelpsiae. 



Explanation of figures 24-27 



FIGS. 24, 25. Brocchinia. FIG. 24. B. cowanii (Maguire, Cowan & Wurdack 30924). a, 

 apex of leaf, x 1; b, branch of inflorescence, X 1; c, sepal and stamen, x 5; d, petal and 

 stamen x 5; e, apex of ovary, x 5; f, seed, x 5. FIG. 25. B. cryptantha {Maguire, Cowan 

 & Wurdack 30 709). a, apex of leaf, x %; b, part of inflorescence, x l / 2 ; c, perianth and an- 

 droecium,x 5; d, apical part of ovary, x 5. FIGS. 26, 27. Navia. FIG. 26. N. lindmani- 

 oides {Maguire, Cowan & Wurdack 30650). a, habit, X l / 10 ; b, apex of leaf, x %; c, margin 

 of leaf, x 5; d, sepal, x 5; e, petal and stamen, x 5; f, pistil x 5. FIG. 27. N. fluviatilis 

 (Maguire & Fanshawe 32360). a, habit, x %\ b, flower, x 5; c, fruit, x 5; d, apical view of 

 flower-bud, X 5; e, sepal, x 5; f, petal and stamen, X 5; g, capsule, X 5,. 



