1963] 



BOTANY OF THE GUAYANA HIGHLANDS PART V 



179 



more prominent glandular-ciliolate external calyx teeth. The external teeth of the 

 Neblina species are rather fragile and often broken off at anthesis. 



Myrmidone lanceolata Cogn. 



Of Cogniaux' criteria for separation of this species from the common M. 

 macrosperma Mart., the only consistent character seems to be the rather persistent 

 rufo-furfuraceous t omentum (consisting- of few-armed stellate hairs and clavate 

 glands) on the branchlets and hypanthium. In M. macrosperma, the hypanthium 

 is nearly or quite glabrous except for the long ± gland-tipped setae, while the 

 stem tomentum is limited to the nodes and lower leaf surface base (although 

 sometimes extending in lines for a short distance below the nodes). In M. lanceo- 

 lata, the tomentum is evenly distributed on young hypanthia and evenly covers 

 the branchlets on all sides (being tardily deciduous). The ovary apex in M. 

 macrosperma is sparsely to moderately setulose while the recent collections of 

 M. lanceolata show densely setulose ovaries, the hairs in both species being in 

 part simple and gland-tipped or with 1-3 arms from the base. I have examined 

 the Kew syntype {Spruce 2336) of M. lanceolata, which is in bud (as were ap- 

 parently the sheets seen by Cogniaux). The only recent collections truly com- 

 parable with the original Spruce specimens are Maguire, Cowan, & Wurdack 

 29956, from the slopes (elev. 800-1100 m) of Cerro Huachamacari, and Maguire, 

 Wurdack, & Bunting 36805, from the lower slopes of Cerro de la Neblina (alt. 

 200-650 m). Apart from numerous lowland collections in Guayana, M. macro- 

 sperma is also known from the Neblina slopes, alt. 650-700 m (Maguire, Wurdack, 

 & Bunting 36817). 



Clidemia heptamera Wurdack, sp. nov. 



A congeneribus vesiciferis differt floribus plerumque 7-meris. 



Frutex 0.5-1.5 m ; rami teretes cum foliorum venis subtus petiolis formicariis- 

 que modice pilis barbel latis debilibus ad 0.5 mm longis obsiti et dense vel modice 

 glanduloso-setosi pilis laevibus plerumque 2-4 mm longis, ad nodos et in petiolis 

 supra dense appresso-setosi pilis barbellatis 1.5-3 mm longis stramineis. Folia 

 plerumque disparilia, in superficie supra modice strigosa pilis laxis glanduliferis 

 1-2.5 mm longis subtus sparse glanduloso-setosa ad margines crenato-serrata 

 dentibus ca. 1 mm profundis et 2-3 mm inter se distantibus. Folia maiora ad 

 petioli apicem vesiculif era ; petioli (vesicis exclusis) 0.4-2 cm longi; vesicae 

 1.5-3 cm longae oblongae vel elliptico-oblongae ; lamina 11-20 X 6-12 cm elliptica 

 vel ovato-elliptica apice breviter (ad 1.5 cm) hebeti-acuminata basi ad 7 mm 

 cordata 7- vel sub-9-nervata. Folia minora vesica destituta vel vesica ad 1.3 cm 

 longa armata; petioli (vesicis exclusis) 0.2-1.2 cm longi; lamina 4-11 X 2.5-7 cm 

 late elliptica apice ca. 0.5 cm hebeti-acuminata basi rotundata vel ad 4 mm cordata 

 5-7-nervata. Inflorescentiae in foliorum superiorum axillis 1-2-fasciculatae 1-2- 

 florae. Pedunculus ad 5 mm longus cum pedicellis hypanthiisque modice vel dense 

 pilis barbellatis ad 0.4 mm longis obsitus ad nodos pilis barbellatis ad 1.5 mm 

 longis dense armatus ; pedicelli 6-9 mm longi ; bracteolae 1-1.2 X 0.3 mm lanceo- 

 latae strigulosae ca. 0.5 mm infra hypanthium insertae persistentes ; flores (6-)7- 

 meri. Hypanthium (ad torum) 3x4 mm; calycis tubus 0.3 mm altus, lobis 

 interioribus 1.1 X 1.9 mm late ovatis apice rotundatis ad margines lacerato- 

 ciliolatis, dentibus exterioribus lobos interiores aequantibus 1-4 setis glanduliferis 

 ca. 1 mm longis armatis. Petala 6.5-7 X 3-4 mm obovato-oblonga apice 1-2 setulis 

 glanduliferis armata ad margines apicem versus vix erosa. Stamina glabra 



