1961] 



BOTANY OF THE GUAYANA HIGHLANDS — PART IV (2) 



43 



stellato-puberulum ; calycis tubus 1-1.2 mm altus subglaber apicem inconspicue 

 5-deutatus deiitibus vix 0.1 mm altis. Petala glabra 5-5.2 X 2.3-2.6 mm oblongo- 

 obovata apice rotuudata. Stamina isomorphica ; filamenta 2.7 mm longa ; antherae 

 2.3 mm longae oblongae non appendiculatae cum poro unico minuto ventraliter 

 subterminali dehiscentes. Stylus ca. 4.5 X 0.5 mm; stigma trimcatum; ovarium 

 3-loculare apice breviter conicum et sparse stellato-puberulum. 



VENEZUELA: Amazonas: Cerro de la Neblina, frequent along upper escarpment slopes 

 east of Camp 3, alt. 1700 m; shrub 2-3 m, flowers pale pink; 27 Dec 1953, Maguire, Wurdack 

 $ Bunting 36833 (holotype, NY). 



The involucrate floral bracteoles of M. perobscura are suggestive of Miconia 

 sect. Tamonea, the hypanthium of sect. Octomeris, but the 4-celled one-pored 

 narrowly oblong" non-subulate anthers are congruent with sect. Aniblyarrhena. 

 No close relatives are apparent, although the leaf venation and shape (apart 

 from the margins) are similar to those of the Ecuadorian M. rivetii Dang. & 

 Cherm. 



Tococa pachystachya Wurdack, sp. now Fig. 33, C-G. 



Ut videtur T. hirtae Berg ex Tr. affinis sed cum floribus sessilibus in racemo 

 pachystachyo. 



Sect. Epiphysca. Frutex 0.5-3 m. Rami cum petiolis laminis innorescentiisque 

 modice setosi setis glanduliferis plerumque ca. 1.5 mm longis sed in formicariis 

 crassioribus et ad 3 mm. Folia plerumque vesiculifera sed pro parte vesiculis 

 nullis; petioli (formicario excluso) ad 1 cm longi ; formicaria in foliis 

 maioribus ca. 2-2.5 cm longa et usque ad 1 cm lata %-2/3 in lamina immersa; 

 lamina vesiculifera plerumque 12-21 X 6-9 cm (in lamina non-vesiculifera 

 4r-7 X 2-3 cm) elliptica vel vix obovato-elliptica apice per ca. 1-1.5 cm sub- 

 caudato-acuminata basi supra formicarium cordulata breviter 7-plinervata (vel 

 in folio minore 7-nervata) nervis omnino supra indistincte impressis subtus 

 vix elevatis nervis secundariis plerumque 3-5 mm inter se distantibus, ad mar- 

 ines indistincte irregulariterque undulata. Inflorescentia tetragona et 4-alata 

 7-15 cm longa 5-8 mm crassa racemiformis ; flores 5-meri sessiles in angulis 

 oppositis rhachis distichi et ut videtur in paribus, ad basim cum bracteolis 

 duabus ca. 2-3 X 1-1.5 mm late ovatis apice obtusis extus apicem versus 

 paucisetosis investi. Hypanthium (ad torum) 3-3.2 mm altum glabrum; calycis 

 tubus 0.9-1 mm altus apice indistincte 5-lobatus lobis rotundatis usque ad 2 mm 

 altis apice 1-2-setosis setis glanduliferis ca. 1.5 mm longis. Petala 6.8-7 X 

 4.2-4.4 mm oblongo-obovata apice oblique truncata glabra. Stamina isomor- 

 phica ; filamenta 4 mm longa ; antherae 3.3-3.5 mm longae oblongae leviter 

 arcuatae ventraliter uniporosae non appendiculatae. Stylus ca. 6 X 0.6 mm; 

 stigma capitatum 1.6-1.9 mm diam. ; ovarium 4-loculare apice glabrum et in 

 collum conicum 1 mm altum circum stylum protractum ; bacca nigro-caerulea ca. 

 7 mm diam., seminibus 1 X 0.6-0.7 mm laevibus angulato-pyramidatis. 



VENEZUELA: Amazonas: Cerro de la Neblina, frequent in upper slope forest east of 

 Camp 3, alt. 1600 m; shrub 1-2 m, petals burnt orange, stamens white; 24 Jan 1954, Maguire, 

 Wurdack 4' Bunting 37368 (holotype, NY) ; upper escarpment slopes east of Camp 3, alt. 

 1700 m, Maguire, Wurdack $ Bunting 36832, 36919; escarpment overlooking Canon Grande 

 below Cumbre Camp, alt. 1650 m, Maguire, Wurdack 4' Bunting 37211; scrub forest along 

 cafio 2 km north of Cumbre Camp, alt. 1700 m, Maguire, Wurdack $ Bunting 37154; Cumbre 

 Camp swale, alt. 1800-1900 m, Maguire, Wurdack $ Maguire 42126 (all paratypes). 



Iii Cogniaux' treatment, T. pachystachya would key closest to T. capitata 

 Trail ex Cogn. and T. trailii Cogn., both of which have a very short inflorescence 



