1958] 



THE BOTANY OF THE GUAYANA HIGHLAND PART III 



107 



eampanulate, glabrous to sparsely glandular.-setulose, the fleshy deltoid to round- 

 ed calyx-lobes about 1 mm long and usually sparsely glandular-setulose. Petals 

 15-20 X 8.5-9.5 mm, ovate to ovate-oval, acute, mucronulate. Stamens usually 

 glabrous, the filaments 7.5-13 mm long; antesepalous stamens with thecae 8.5-13 

 mm long, the connective prolonged 1-3.5 mm to the filament insertion, the ventral 

 acute spurs 0.4-1 mm long, the dorsal seta 2.5-7 mm long; alternisepalous 

 stamens with thecae 9-11.5 mm long, the connective prolonged 0.5-0.9 mm to 

 the filament insertion, the ventral acute spurs 1-2 mm long, the dorsal seta 

 2.5-4.5 mm long. Style 15-27 mm long, glabrous; ovary glabrous or sparsely 

 glandular-puberulous. Seeds 0.9 X 0.6 mm, the tubercles about 0.06 mm high. 



Type Collection: VENEZUELA: Rio AtabapO near San Baltazar, Bonpland 936 (Holo- 

 type and isotype, P). 



Additional Material: VENEZUELA: Amazonas: Cafio Cupaven, Rio Orinoco near mouth 

 of Rio Atabapo, Level 68 (NY); Yapacana savannas, Maguire, Cowan, 4' Wurdaek 30579 

 (NY), Maguire, WurdacTc, $ Bunting 36609 (NY); Sabana Grande, Esmeralda, Maguire $ 

 Wurdaek 34690 (NY); Oano Pimichm sabanita near Pimichm, Maguire, WurdacTc, Bunting 

 36390 (NY); savanna on right bank of Rio Pacimoni 50 km above mouth, Maguire, Wurdaek, 

 # Bunting 37558 (NY). BRAZIL: Amazonas: lower Rio Curicuriary, Vueke H.J.B.E. ,24105 

 (isotypes of P. srandens, V, US ) ; Rio Negro, Uanauaca, Frors 21329 (IAN, NY, U). 



The collections 36609 and 36390 are fruiting only ; 1 have been unable to find 

 any ovarial pubescence in collections other than these two. even in one available 

 fruiting branch of 34690. Of all the recent collections. Level 68 is the best match 

 for the holotype. In part of 34690, the filaments apically have a few glandular 

 hairs. Flower size varies greatly within the cited specimens. Duckc 24105, MWB 

 37558, and Froes 22329 have approximately isomorphic stamens. MW 34690 has 

 quite anisomorphic stamens, while Level 68 has considerable variability (with 

 generally anisomorphic stamens). 



3. Pachyloma setosum Wurdaek, sp. now 



A congeneribns differt foliorum superficie glanduloso-setosa, ovarii apice 

 setoso-coronato setis glanduliferis. 



Frutex 0.2-2 m; rami congesti teretes cum petiolis pedunculis pedicellis<|ne 

 modice persistenter(ine glanduloso-setosi . Petioli 2-4 mm; lamina 3-8.5 X 1-5- 

 3.5 cm, ovalis apice rotundata mucronulata basi rotundata trinervia vel nervis 

 duobus obsoletis inframarginalibus additiciis; nervis primariis supra anguste 

 linpressis subtus prominentibus, nervis secundariis inconspicue evolutis, supra 

 sparse conspicueque glanduloso-setosa setis ad 4 mm longis glandulis caducis, 

 subtus sparse glanduloso-setosa praecipue ad nervos superficie cum glandulis 

 sessilibus 4-6/mm 2 ornata, marginibus glanduloso-setosis. Inflorescentia termi- 

 nalia e dichasiis paucis composita ; pedicelli 1-13 mm infra bracteolas, 1-3 mm 

 supra; bracteolae caducae oblanceolatae vel lineares 1.1-3 X 0.5-1.5 mm, glandu- 

 loso-ciliolatae. Hypanthium cylindrico-campanulatum 9-10 mm longum con- 

 spicue glanduloso-setosum calycis lobis obtusis inconspicuis. Petala 16.5-17 X 

 11.5-12 mm, ovalia apice breviter cuspidata extus apicem versus persparse 

 glanduloso-setosa. Stamina isomorphica ; thecae 10-11 mm longae, connectivo 

 sub loculis 1 mm protracto appendicibus ventralibus acutis 1.5 mm longis, seta, 

 dorsali 3.5-4 nun longa, paulo supra insertionem filamenti inserta, filamento 9 

 mm longo glabro. Stylus 16-17 mm longus. glaber; ovarium 6.5 mm altum, 

 apice setis multis glanduliferis coronatum ; hypanthium fructiferum 15 X 10 

 mm obtuse 8-costatum ; semina 1 X 0.9 mm cochleata valde muriculata. 



Type : sabanita 1 km Avest of Maroa, elev. 130 m, Rio Guainia, Terr. Ama- 



