1963] 



BOTAXY OF THE GUAYAXA HIGHLANDS PART V 



147 



hypanthiisque sparse strigosi (pilis debilibus gracilliniis) inox glabrati. Petioli 

 1.5-3 cm; lamina (5-)7-15 X 3-7 cm elliptica apice obtusa et minute (ad 2 mm) 

 mueronata basi obtusa eoriaeea. supra et subtus primum sparse strigulosa (pilis 

 graeillimus) mox (nervis primariis subtus exeeptis) glabrata 5- vel sub-7-nervata 

 nervis seeundariis paree distinctis tertiariis non evolutis, ad margines densissime 

 eiliata pilis graeilibus primum ravis demum fuseis. Inflorescentia 10-20 cm longa 

 racemiformis angusta verticillato-interrupta vertieillorum singulorum floribus 

 4—8 : pedieelli 2-5 mm longi ; flores 5(-6)-meri. Hypanthium (ad torum) 8-9 mm 

 longum; calycis tubus 2 mm longus, lobis interioribus ca. 1-1.5 X 3 mm obverse 

 elliptieis. dentibus exterioribus anguste acutis ea. 1 mm eminentibus. Petala 

 22-25 X 11—15 mm asymmetric* obovata apice hebeti-obtusa. Stamina dimorphica. 

 Stamina maiora : filamenta 10-11 mm longa ; antherae 10 mm longae curvatae 

 subulatae. connectivo basi dorsaliter dente acuto 0.7-1 mm alto et appendice 

 adscendenti truncata 3.5-4 mm longa. Stamina minora: filamenta 11.5-12 mm 

 longa : antherae 5.5-6.1 mm longae, connectivo basi dorsaliter dente acuto ca. 

 0.3 mm alto et appendice adscendenti 3-4 mm longa. Stylus 10.5-13 X 1.3-0.5 

 mm : stigma punctiforme : ovarium 3-loculare glabrum apice in collum 0.7 mm 

 altum protractnm. 



Type. Petals pink, frequent on slopes of Piedra Arauicaua. Rio Yatua. Terr. 

 Amazonas. Venezuela, alt. 150-500 m. 15 Jul 1959. J. J. Wurdack & L. S. 

 Adderley 43451 ( hoi o type US 2342634). Paratypes. VENEZUELA. Terr. Ama- 

 zonas. Rio Yatua: Piedra Arauicaua, Maguire, Wurdack d' Bunting 37473. 

 Maguire, Wurdack t(- Maguire 41610. Rio Siapa : crystalline dome on right bank 

 of river just below Raudal Gallineta. alt. 300-700 m. Wurdack c(- Adderley 43543. 



A. fruticosa (now known at anthesis by the topotypical Maguire, Wurdack. & 

 Keith 41798) has lower leaf surfaces and hypanthia densely and persistently 

 fine-strigulose. sessile or scarcely (to 1 cm) pedunculate inflorescences, and ovate 

 interior calyx lobes 2.5-3 mm long. .4. barbata Triana, apart from the distinctive 

 lower leaf surface malpighian hairs, has inflorescences usually trifurcate from 

 at or near the base, as well as densely pubescent hypanthia. The Peruvian A. 

 macrantha Gleason, described as arborescent, has thinner larger acute leaf blades 

 with prominent secondary nerves, as well as flower verticels on lateral branchlets 

 and non-emergent external calyx teeth. The holotype (K) of A. rotundifolia 

 Triana. from forests along the Rio Casiquiare. has been examined: that species 

 apparently has a vining habit, branched inflorescences with less robust axes, finer 

 marginal leaf hairs, and (judging from the fruit) much smaller flowers. A. saxosa 

 is abundant on the piedra slopes at both known localities, but is definitely a 

 rainy-season flowerer ; the Arauicaua paratypes are in young (Sep 27) and old 

 (Feb 3) fruit. 



Phainantha maguirei Wurdack, sp. nov. Fig. 65. a-h. 



P. laxi florae (Tr.) Gleas. affinis sed foliis subtus nervis primariis exeeptis 

 glabris staminum maiorum connectivis prolongatis. 



Frutex scandens : ramuli petiolis inflorescentiisque sparse setulosi demum 

 glabrati. Folia pseudoalternata. uno non evoluto ; petioli 0.7-1.5 cm: lamina 



7- 10 X 3-5.5 cm ovato-elliptica apice breviter graditerque acuminata basi vix 

 (ad 2 mm) cordata rigida. supra glabra, subtus in nervis primariis sparsissime 

 setulosa in superficie glabra. 5-nervata jugo exteriore marginali nervulis obscuris. 

 ad margines apicem versus distanter ciliolato-serrulatis ciliis caducis. Panicula 



8- 12 cm longa terminalis saepe e basi inaequaliter biramosa ; flores 4-meri 



