1958] 



THE BOTANY OF THE G I" AY AX A HIGHLAND PART III 



101 



The young stem pubescence of 31. rigida is long and appressed, the leaf- 

 blades are generally widest above the middle (obovate), and the ovary and fruit 

 are predominantly 3-celled. Among the Macairea species keyed by Gleason (Bull. 

 Torrey Club 61: 35-40. 1934), 31. neUinae would fall in Species Group II. The 

 sepal shape differentiates 31. radula (Bonpl.) DC. and 31. pachyphylla Benth. ; 

 the larger 3-nerved leaves and relatively longer sepals separate 31. viscosa Ducke. 

 .1/. tin rcsiae Cogn. (ex char.) has larger 3-nerved leaves, subsessile flowers, and 

 shorter sepals. The collections of 31. neblinae are predominantly fruiting but 

 sufficient old flowers remain for diagnosis. 



Tibouchina fraterna X. E. Brown subsp. paruana Wurdaek, subsp. nov. 



A subsp. fraterna differt pubescentia hypanthii toto longiore, calycis lobis 

 august ioribus. 



Pili hypanthii (1-) 2-5 mm longi. Calycis lobi vix 1 mm lati longe (ad 1.5 

 mm) ciliati extus longe (plerumque 1-1.5 mm) squamuloso-strigosi. 



Type: shrub 1 m, frequent in cumbre along west rim just north of camp eano 

 head, elev 2000 m, Serrania Paru, Terr. Amazonas. Venezuela, Jan 31, 1951, 

 R. 8. Cowan cfe -/. Wurdaek 31O60 (NY). Paratype : same locality and date. 

 Cowan d- ^Yurelack 31097. 



In T. fraterna ssp. fraterna, the hypanthial pubescenee (except for the sinal 

 setae) is about 1 mm long; the ealyx lobes are 1.5-2 mm wide, short-ciliate (the 

 hairs about 0.5 mm long), and outside short-squamose (the squamae about 0.5 

 mm long). In foliage, the two subspecies seem identical. 



Tibouchina dissitiflora Wurdaek, sp. nov. Figure 11. h-ni. q. 



T. f rat emeu X. E. Br. affinis sed floribus maioribus solitariis. pubescentia 

 foliorum subtus aliter ; T. duidae GI. et T. sipapoanae Gl. affinis sed foliis dis- 

 tincte trinerviis. 



Fruticosa ; ramuli, petioli, folia subtus, hypanthium. sepalaque squamis plus- 

 minusve ciliolatis omnino obsiti. Petioli crassi 2-4 mm longi ; lamina crasse 

 coriacea 1-2.5 X 0.8-1.5 em, elliptiea vel suborbicularis, apice late acuta vel 

 obtusa et plerumque breviter apiculata. basi acuta vel obtusa, trinervia vel 

 indistinct^ 5-nervia (nervis lateralibus a marginibus 1-2 mm distantibus) nervis 

 supra insculptis subtus elevatis, supra striolata et in lineis longitudinalibus dis- 

 tinctis elevatis inter nervos indistinete vel distincte squamulosa. Flores 5-meri 

 in ramulis solitarii sessiles vel vix (ad 1 mm) pedicellati. bracteis 2-4 liberis 

 investi, bracteis duabus extimis foliaceis et petiolatis vel bracteosis et sessilibus, 

 8-11 X 3-5 mm, extus squamosis intus striolatis vel apicem versus squamosis et 

 basim versus glabris. duabus intimis sessilibus ovatis extus squamosis intus gla- 

 bris. Hypanthium 6-6.5 X 5-6 mm. ; calycis tubus 0.5 mm altus, lobis 7-11 3-3.5 

 mm. ovatis vel ovato-triangularibus apice acutis vel parce acuminatis intus 

 glabris. Petala 12-19 X 8-17 mm. obovata oblique truncata vel rotundata breviter 

 glanduloso-ciliolata. Stamina paulo dimorpha glabra, thecis apice attenuatis. 

 Stamina maiora : filamenta 7-10.5 mm ; thecae 6.5-7.5 mm. connectivo sub thecis 

 2-3 mm producto basi vix (ad 0.7 mm) hebetibilobulato. Stamina minora: 

 filamenta 6-9.5 mm; thecae 6-7 mm, connectivo sub thecis 1.3-1.7 mm producto 

 basi vix (ad 0.5 mm) hebetibilobulato. Stvlus 12—16.5 X 0. < mm g*laber vel 

 sparsissime squamulatus ; ovarium 5-loculare in parte dimidiali apicali squamo- 

 sum vel squamoso-setosum. 



