1961] 



BOTANY OF THE GUAYANA HIGHLANDS PART IV (2) 



23 



2. Clusia gratula Maguire, sp. nov. Fig. 28 f-k. 



Arbor parva 5-10 m alta ; ramulis teretibus 2—5 mm diam. ; latiee claro 

 moderato; internodiis vulgo 2-5 cm longis; foliis valde petiolatis; laminis el- 

 lipticis vel elliptieo-oblanceolatis, subchartaceis, 8-15 cm longis, 4-7 cm latis, 

 apice acuto vel acuminata, basi acuta, costa prominenti, venis primariis pro- 

 minulis vulgo 1.5-3.0 mm distantibus, ad 15°-30° adscendentibus; petiolis (1.5) 

 2-3 cm longis. 1.5-2.0 mm latis ; inflorescentiis masculis vulgo 15-30-floribus. 

 4—7 cm longis, recurvatis vel reflexis, ramulis adscendentibus vel divaricatis. 

 sepalis 3-jngis, deeussatis, albidis, inferior ibus late suborbicularibus ca. 2 mm 

 longis, superioribus oblongis 5-6 mm longis; petalis 5, oblongo-obovatis, 10-12 

 mm longis; staminibus 20-30 in columna semisphaeroidali 2-3 mm alta connatis, 

 thecis distaliter annularibus immersis ; ovario nullo ; inflorescentiis femineis 

 vulgo 7-15-floribus ; petalis 8-10 mm longis; androecio in annulo 3—4 mm alto, 

 thecis 1— 2-seriatis probabiliter fertilibus; ovario 5-loculari, stigmatibus stylis 

 brevibus instructis; fructu oblongo. 15-20 mm longo, endocarpo valde cartil- 

 agineo, valde rugoso, rostro ca. 1 mm longo ; stylis 0.5-1.5 mm longis. 



VENEZUELA: Amazonas: Cerro cle la Neblina, Bio Pacimoni-Yatua, frequent in Clusia 

 tangle vicinity Camp III; alt. 700 m ; sprawling tree 5-8 m high; latex clear, moderate; 

 petals white with red-lacquered bases; 14 Nov 1957; Bassett Maguire, John J. JVurdack 4' 

 Cdia K. Maguire 42065$ (holotype, NY); occasional, Clusia ''moss forest," vicinity Camp 

 III; alt. 700 m; slender subscandent tree to 10 m; latex clear; sepals white, petals white 

 with maroon centers; 23 Dec 1953, Maguire, WurdacTc 4' Bunting 36819$; 19 Dec 1953, 

 36972$ ; occasional, upper Bio Yaciba (Yatua) 3-8 km below Base Camp; alt. 140 m; small 

 riverine tree with moderate clear latex; fruit oblong, slightly pentagonal, pellucid-white, 

 flushed red, stigmas white, short-beaked; 30 Jan 1954, Maguire, JVurdack 4' Bunting 37437 9, 

 37425 9 ; Clusia tangle south Camp III; alt. 700 m; 14-16 Nov 1957, Maguire, WurdacTc $ 

 Maguire 420669 ; 5 Jan 1958, 42600 9 ; Canon Grande; alt. 1100 m; 24 Nov 1957, Maguire, 

 WurdacTc 4- Maguire 42208 9 ; 24 Dec 1957, 42477 $ (paratypes). 



Clusia gratula with dainty (hence the epithet), diminutive flowers, so far as 

 collected confined to Cerro de la Neblina and the piedmont streams, is obviously 

 closely related to and probably derived from C. columnaris, a common riverine 

 and low-altitude rock-exposure species of black-water streams in the upper Rio 

 Xegro drainage. The presumptive derivative, C. gratula, differs decisively from 

 C. columnaris in its leaves of different form and texture, its consistently smaller 

 flowers and fruit, and the development of discrete styles. 



3. Clusia annularis Maguire, sp. nov. Fig. 29. 



Arbor parva 4-10 m alta ; ramulis crassis vulgo ca. 1 cm diam., subsucculen- 

 tibus, nodis 1-2 cm distantibus; foliis sessilibus vel subsessilibus, laminis late 

 obovatis, coriaceis, vulgo 15-20 cm longis, 10-15 cm latis, apice late obtuso vel 

 rotundato, basi obtusiuscula, costa prominenti, venis primariis prominulis 2-6 

 mm distantibus, angulo 20-30° adscendentibus, canalibus laticiferis plus minusve 

 evidentibus, angulo 70-90° adscendentibus; inflorescentiis masculis amplis ad 

 20 em longas 7-2 1-flor ibus, vulgo recurvatis ; floribus masculis : sepalis 3-jugatis 

 albidis, inferioribus reniformibus 2-4 mm longis, superioribus orbicularibus vel 

 late oblongo-obovatis, ad 15 mm longa ; petalis 5, spathulati-obovatis, 2-3 cm 

 longis, 1.5-2.0 em latis; staminibus vulgo 20-30, in columna prismatica 3-5 mm 

 alta connatis, thecis distaliter orbicularibus annularibus vel disciformibus im- 

 mersis, ovario nullo ; inflorescentiis foemineis 3-9-floribus ; floribus foemineis : 

 sepalis 6-8, petalis 5, androeciis annuliformibus, annulis 3-4 mm altis; stamini- 



