1963] 



BOTANY OF THE GUAYANA HIGHLANDS — PART V 



127 



is correct in associating M. rupicola with M. ptaritepuiana, insofar as to their 

 occupancy of Roraima sandstone areas. 



5. Moronobea jenmani Engl. Fl. Bras. 12 1 : 467. 1888. 



Moronobea jenmani occupies low altitude (400-1200 m) woodland or savanna 

 areas, and was earlier thought by me to be the low altitude analogue of M. 

 intermedia. However, the spiral arrangement of the stamens, the feeble cohesion 

 of the filaments forming the discrete stamen bundles, the delicacy of the anthers, 

 and the very long slender style, all mark the distinctness of M. jenmani. Con- 

 siderable plasticity is found in leaf form and texture. 



Key to the varieties of Moronobea jenmani 



1. Leaf blades broadly obovate, rounded, 8-12 cm long, 4-6 em broad, thickly 



coriaceous; plants of savanna or open areas. var. jenmani. 



1. Leaf blades oblanceolate to elliptic-oblanceolate, obtuse, acutish, or apiculate, com- 

 monly 10-14 cm long, 3-G cm broad, veins more prominent beneath, subcoriaceous 

 plants of woodlands. var. fanshawei. 



Moronobea jenmani Engl. var. jenmani 



Type. Kaieteur Savanna, British Guiana, Jenman 949 (K, photo NY). 



Besides the type, only one additional collection of var. jenmani is known to 

 me, viz., Maguire & Fanshawe 23442, from the Kaieteur Savanna. This topotype, 

 a fruiting collection, is a close match of the flowering type specimen. 



Moronobea jenmani Engl. var. fanshawei Maguire, var. nov. Fig. 60. 



A var. jenmani differt foliis maioribus, oblanceolatis vel elliptico-oblanceolatis, 

 obtusis, acutiusculis vel apiculatis, vulgo 10-14 cm longis, 3-6 cm latis. 



Type. Tree exceeding 10 m, with copious yellow latex; calyx green, buds 

 yellow, petals cream colored, yellowish-green towards margins, pink towards 

 center; common in forest, alt, 2450 m between Chinowieng and Mt. Ayanganna, 

 British Guiana, 22 Jul 1960, 8. S. Tillett, C. L. Tillett & R. Boy an 44904 (holo- 

 type NY). Paratypes. BRITISH GUIANA, Pakaraima Mts. : Imbaimadai wood- 

 land, Maguire & Fanshawe 32234, 32235; woodland, Chinowieng, Maguire, 

 Bagshatv & Maguire 40658; forest Utschi Mouth, Kamarang River, alt. 2100 ft, 

 Tillett & Tillett 45822; Partang River, Tillett, Tillett & Boyan 44846. VEN- 

 EZUELA : Roraima, Arabupa, Tate 238 (NY). 



6. Moronobea intermedia Engl, in im Thurn, Timehri 5 : 189. 1886 ; Trans. Linn. 



Soc. II. 2: 271. 1887. 



Type. Roraima [Venezuela], F. im Thurn 337 (K, photo NY). 



Moronobea intermedia is a higher montane species confined to the sandstone 

 mesas of the eastern Guayana Highland. Superficially in habit and in general 

 facies it appears to merge with M. jenmani, a species of greater size, larger 

 flowers and larger more variable leaves, which occupies lower altitude on the 

 sandstones of the eastern Highland region. But the two are invariably distin- 

 guishable by erect alignment of the stamens and the consequent lack of spiral 

 engravature of the ovary and fruit, and the much shorter stout style of M. 

 intermedia. 



