1961] 



BOTANY OF THE GUAYANA HIGHLANDS — PART IV (2) 



25 



bus vulgo 15-25, vulgo 2-seriatis, thecis fertilibus; ovario 5-loculari, ovulis 2-3- 

 seriatis, stigmatibus 5, sessilibus, umbraeuliformibus ; fructu oblongo ca. 3 cm 

 longo, endocarpo cartilagineo, non evidenter rugoso, rostro 2-4 mm longo. 



VENEZUELA : Amazonas: Rio Ventuari, frequent, dry open eastern slopes Cerro Moriche; 

 alt. 1000 m; small tree to 5 m high; petals 5, white with laequer-red centers; 15 Jan 1951, 

 Bassett Maguire, E. S. Cowan 4' J- J- Wurdack 30848 (holotvpe, NY). Cerro Yapacana, Kio 

 Orinoco, frequent on cumbre; alt. 1200 in; tree 8 in high; sepals 6, white; petals 5, white with 

 lacquer-red base; androecium compact, columnar, base red; 3 Jan 1951, Maguire, Cowan 4' Wur- 

 dack 30666$. Cerro Moriche; tree 3-10 m high; sepals 8; 13 Jan 1951, Maguire, Cowan 4 

 Wurdack 30851 $. Cerro Yapacana, Maguire, Cowan 4' Wurdack 30667 $, 30730 $ , 30732 $, 

 37033 9 ; Cerro Moriche, Maguire, Cowan 4' Wurdaek 30962 $, 30963 $ (paratypes). 



One collection, Maguire cO Politi 28666 9 , collected on Cerro Sipapo, Ama- 

 zonas, Venezuela, at 2100 m, 27 Jan 1949, is to be referred to C. annularis, but 

 its leaves are narrower and the apex obtusish only. This collection may repre- 

 sent a geographic and ecologic variant. 



4. Clusia brachystyla Maguire, sp. nov. Fig. 28 a-e. 



Arbor parva ; ramulis quadrangularibus ; latice claro exiguo ; foliis valde 

 petiolatis, laminis vulgo elliptico-obovatis, coriaceis; inflorescentiis masculis 7—15- 

 floribus; sepalis 3 (-4) jugis, albidis; petalis 5 panduriformibus albidis vel 

 roseis, ad basim rubris, vel rare petalis omnino albis; androecio in massa 

 centrali coalescenti, ovario absenti absolute; staminibus 30-40 in columna pen- 

 tagonali 3-5 mm alta connatis; thecis distaliter annularibus immersis; in- 

 florescentiis foemineis vulgo 3-7-fioribus, androecio in annulo 3-5 mm alto, 

 thecis 1-2-seriatis, probabiliter saepe fertilibus; ovario 5-loculari, ovulis num- 

 erosis 3-seriatis, rostro defecto, stigmatibus 5, sessilibus; fructibus obpyriform- 

 ibus, ad 5.5 cm longos, 3.5 cm diam., valde transverse rugulosis. 



Key to the Varieties of Clusia brachystyla 



1. Leaves subcoriaceous, commonly exceeding 12 cm in length, pale beneath; mature 

 fruit ca. 3 cm long, the stigmas hemispheric-umbraculiform, 8-10 mm in diameter 

 at maturity. var. brachystyla. 



1. Leaves coriaceous, commonly under 12 cm in length, reddish-brown beneath; mature 

 fruit ca. 5 cm long, the stigmas flat, 15-20 mm in diameter at maturity. 



var. g u a iq u i n i m e ns is. 



Clusia brachystyla var. brachystyla. 



Branchlets moderately quadrangular; leaf-blades obovate to elliptic-obovate 

 or oblanceolate, obtuse or abruptly acute, 10-20 cm long, 5-10 em broad ; 

 mature fruit obpyriform, strongly rugose, to 3 cm long; stigmas hemispheric- 

 umbraculiform, 8-10 mm in diameter. 



VENEZUELA: Bolivar: vicinity of Mision Santa Teresita de Kavanayen; occasional, 

 forested slopes below south rim of savanna plateau, alt. 1200 m; savannas; 11 Dec 1952, 

 Bassett Maguire 4' John J. Wurdack 33754$ (holotvpe, NY); woodland slopes southeast of 

 Kavanayen Mission, alt. 1400 m; 30 Mar 1952, Maguire 33707 9 (paratype). Ptari-tepui ; alt. 

 1600 m; 10-11 Nov 1944, Steyermark 59992$ (NY). Arabupu, Mt Eoraima ; 21 Jan 1939, 

 Pinkus 173 $ . Amazonas: Rio Cunucunuma, frequent, trail ascending Cerro Duida ; alt. 800 m; 

 small tree 10 m high, petals white with red centers; 25 Nov 1950, Maguire, Cowan 4' Wurdaek 



Fig. 29. a-k, Clusia annularis, a, leaf and inflorescence, habit, X 0.5. b, sepals, dorsal 

 view, XI- c, $ floAver, X 1. d, $ flower, X 1- e, tangential section through fruit, X 1. 

 f, cross section of fruit, X 1.5, g, stigma, X 2. h, portion of synandrium, X 7. i, diagram 

 of face view' of anther, X 15. j, diagram of median long section through stamen, X 15. k, 

 pollen grain, X 900. 



