1958] 



THE BOTANY OF THE GUAYANA HIGHLAND PART III 



•Vi 



1. Styles coalesced into a disc, only the tips free; stigmas distally recurved; fruit 

 linear-oblong, ca. 3 cm long, 8-12 mm in diameter; anthers ca. 1 mm long, elavate, 

 the thecae laterally dehiscing distally for about half their length ; leaves oblan- 

 ceolate, usually less than 15 cm long; pistillate inflorescence 3-5-flo\vered ; staminate 

 inflorescence 7-18-flowered. Subsect. Clusiastrum. 10. C. cuneata. 



1. Clusia crassifolia PI. & Tr. Ann. Sci. Nat. ser. IV. Bot. 13: 351. 1860. 



Small tree to 10 m high with scanty or moderately copious whitish latex; 

 branchlets stout, subterete, subsucculent, considerably wrinkling when dry, the 

 internodes 1.5-4.0 cm long'; petioles 12-20 mm long, broadly winged; blades 

 thickly coriaceous, broadly obvate, 10-15 (18) cm long, (6) 7-9 cm wide, the 

 apex rounded to subtruncate, the base cuneate, the midrib very prominent, ex- 

 tending to the apex, the lateral veins prominulous, 4-5 mm apart, ascending at 

 a 45-50° angle and collected in a marginal nerve 2-3 mm from the hyaline revo- 

 lute margin; inflorescence terminal, compact, 3-12-flowered, the peduncle coarse, 

 2-3 cm long, the bracts 8-14 mm long, oblong or obovate-oblong, keeled, obtuse, 

 scarious-margined ; sepals 7, tin 1 lowermost pair decussate, the upper 5 imbricate, 

 oi-bicnlar-obovate, 10-12 mm long, conspicuously white-scarious-marginate ; petals 

 normally 8, cuneate-obovate, 2.5-3.0 cm long, 2.0-2.5 cm broad, white; stamens 

 of the staminate flower numerous, the marginal stamens subsessile, 12-1 5-seriate, 

 borne on a cupulate disc ca. 2 mm high, the interior stamens over the entire 

 summit of the receptacle, the filaments subulate 3-5 mm long, almost twice the 

 thickness of the 2-4-mm-long anthers, the anthers 4-eelled, laterally dehiscing by 

 snbterminal pores that extend to the middle of the anther; staminodia of the 

 pistillate flower numtrous, ca. 5 mm long, anantherous, 2-3-seriate, affixed on a 

 cupulate disc ca. 1 mm high; ovary 16-20-locular, the locules multiovulate, the 

 ovules horizontally spreading, biseriate; styles 1(5 or the same number as the 

 locules, filiform, 5-6 mm long; stigmas apical, ovate-capitate, ca. 1 mm long. 



Type: "Roraima," Schomburgk 709. 



Specimens examined: BRITISH GUIANA: Kaieteur Savannas: Jenman 1259 (K) ; 

 Maguire $ Fanshawc 23060 9 ; 23060 $ ; 23061 9 ; summit of east-facing escarpment, Mt. 

 Ebini, Mahdia River, Potaro River, 700 m alt., Maguire 32125 9. VENEZUELA: Edo.Boli- 

 var: "Roraima" Schomburgk 709 (holotype P, isotypes G, K). Auyan-tepiu: at 2200 m alt., 

 Tate 1337 (NY) ; 2300 m alt., Vareschi # Foldats 4888 (YEN, NY) ; 1900 m alt., Foldats 2621 

 (VEN, NY). Ptari-tepui: at 1810 m alt., SteyermarTc 59508 (F, NY) ; southwest slope forest 

 at 1500-2000 m alt., Maguire # WurdacTc 33872$ (NY), 33908$ (NY), 33909 9 (NY). 

 Sororopan-tepui at 1800 m alt., Maguire # WurdacTc 33933$. Ilu-tepui: 1300-1400 m alt., 

 Maguire 332219 (NY), 33220$ (NY), at 2000 m alt., Maguire 3336S $ ; at 1600 m alt., 

 Maguire 33285$ (NY). Chimanta-tepin : Churi-tepui at 2050 m alt., WurdacTc 34252 9 (NY) ; 

 Sarven-tepui at 1500 m alt., WurdacTc 34090$ (NY); Abacapa-tepm, at 2000-2125 m alt., 

 SteyermarTc 75004 9 (F, NY), 75009 9 (F, NY) ; Chimanta Massif at 1925 m alt., SteyermarTc 

 4- WurdacTc 376 9 (F, NY), 372 $ (F, NY). 



2. Clusia phelpsiana Maguire, sp. nov. Figure 8. 



Arbor parva, 10-15 m alta ; ramis subsucculentis teretibus, 6-8 mm diam., 

 internodiis 8-15 mm longis, latice copioso albido; foliis ellipticis vel elliptico- 

 oblanceolatis, sessilibus vel petiolo conspicue alato 4-6 mm longo, amplectanti; 

 laminis 8-13 cm longis, 3.5-5.0 cm latis, coriaceis, costa prominenti, nervis later- 

 alibus prominulis, in nervo collectivo a margine 1.0-1.5 mm remoto ; inflorescentia 

 masculina terminali uniflora vel aliquando triflora; pedunculo 3-5 cm longo ; 



