1960] 



BOTAXY OF THE GUAYANA HIGHLAND PART IV 



25 



2. Inflorescence dichasial, consisting of two cincinnoid racemes and a terminal flower 

 at the apex of the peduncle (cf. Fig. lOd) ; larger sepals broadly ovate or ovate- 

 oblong, 1.5-5 mm wide. Hairs compound, dendroid with the branches closely aggre- 

 gated on the basal part of the main axis, the latter long-attenuate in a more or 



less rigid point. 2. B. stelligera. 



3. Hairs simple 4. 



3. Hairs compound, stellate or appearing so. 10. 



4. Leaves linear, strongly revolute. Flowers about 6 mm long, the corolla tube nearly 

 straight. 8. JR. linearis. 



4. Leaves elliptic, oval, or ovate. Flowers longer than 6 mm, the corolla usually ob- 

 viously arcuate. 5. 



5. Inflorescence spicate, the calyx thick, densely pilose-velutinous. Leaves and stems 

 densely velutinous. 11. B. nubicola. 



5. Inflorescence dichasial (cf. Fig. lOd), consisting of two cincinnoid racemes and a 

 terminal flower at the apex of the peduncle, or the inflorescence reduced to a solitary 

 flower. 6. 



6. Flowers solitary. Vegetative parts hispid, the leaves ovate to broadly so. 7. B. paruana. 



6. Flowers in dichasia (cf. Fig. 10d). Vegetative parts not hispid, the leaves elliptic, 



oval, or ovate. 7. 



7. Leaves pilose on the undersurfaces. Corolla white; sepals elliptic-oblong. Fertile 

 anthers lanceolate, mucvonate by a prolongation of the connective about 1 mm long. 



6. B. abyssicola. 



7. Leaves strigulose, sericeous, or tomentose on undersurfaces. Corolla pale lilac, pink, 

 or red; sepals ovate, lanceolate, or oblanceolate to elliptic. Fertile anthers oblong, 



not mucronate. 8. 



8. Leaves strigulose only on primary veins beneath. Style pilosulose ; corolla red. 



3. B. ruellioides. 



8. Leaves sericeous or tomentose on undersurfaces, the latter obscured by the pub- 

 escence. Style glabrous; corolla pale lilac or pink. 9. 



9. Larger sepals broadly elliptic, 3-3.5 mm long; corolla tube 5.5 mm long. Leaves 

 sericeous beneath. 4. B. sericea. 



9. Larger sepals oblanceolate to narrowly elliptic, 5.5 mm long; corolla tube 9 mm 



long. Leaves usually tomentose beneath. 5. B. fraterna. 



10. Pubescence buff-canescent, densely aggregated on most parts, the lower leaflet 

 surfaces completely obscured, the hairs dendroid. Leaves strongly convex-revolute, 

 not mucronate. Inflorescence spicate. 9. B. tomentosa. 



10. Pubescence red-brown, not obscuring completely the lower leaf surfaces, the hairs 

 stellate, stipitate. Leaves about plane, the midrib often extended beyond the blade 

 in a short, rigid, blunt mucro. Inflorescence dichasial, consisting of two cincinnoid 

 spikes and a terminal flower at apex of the peduncle (cf. Fig. lOd). 10. B. peduncularis. 



1. Raveniopsis trifoliolata Cowan, sp. nov. Fig. 19. 



Arbuseulae 1-2 m altae, ramulis rubidis et minute strigulosis. Folia digitato- 

 trifoliolata (interdum unifoliolata) ; petioli 27-40 mm longi, graciles, minute 

 strigulosi, foliolorum lateralium petiolulis 1.5-3 mm longis, minute strigulosis, 

 folioli terminalis petiolulis 5-10 mm longis ; foliolorum laminae ehartaeeae, 

 ellipticae, 5-9 cm longae, 3-4 cm latae, aeutae, foliolorum lateralium base in- 

 aequilaterali, latere inferiore obtuso sed superiore attenuato-acuto, folioli 

 terminalis base attenuato-cuneato, aequilaterali, supra glabrae, infra costa 

 strigulosae sparse, costa salienti, venis primariis ca. 10-jugatis. Inflorescentiae 

 axillares, solitariae vel binatae, unilaterale racemosae, 10-20 cm longae, ped- 

 unculo 4-6.5 cm longo, sparse puberulo, gracili, axe striguloso et puberulo, 

 pedicellis 1-1.5 mm longis, minuto-strigulosis sparse. Sepala plus minasve 

 chartacea, acuta, minute strigulosa sparse, duobus lanceolatis, 5.5-7 mm longis, 

 1.5 mm latis, sepalis ceteris ca. triangularibus, 1-1.5 mm longis, 0.5-1 mm latis. 

 Corollae tubus curvatus, glaber, 10.5-12 mm longus, infundibuliformis, lobo 10 

 mm longo, 3.5 mm lato, lobis ceteris ca. 5-8 mm longis, 1.5-3 mm latis. Stamina 

 5, duobus fertilibus, filamentis ligulatis, 15 mm longis, antheris 2.5 mm longis, 



