66 



It grows in the true " catinga,''* being found especially on the 

 mountain slopes, which might be called " mountain catinga." It 

 avoids the more park-like situations, where isolated and somewhat 

 larger trees are more prominent and prefers a rather denser 

 woody " catinga." The tree thrives best on red, loamy soil, and 

 is found more rarely on sandy soil. Some miles from Porto 

 Alegre. on the Rio das Contas* the mountain slopes have been 

 seen by Ule so well covered by these trees that thev constituted 

 nearly 50 per cent, of the forest. 



It seems probable, however, that the wild supplv will soon be 

 exhausted. 



Manihot heptaphylla and M. piauhyensis, whose rubber is ex- 

 ported principally along the Rio San Francisco, are quite different 

 in naoit from M. dichotoma. Thev K " fU f , ~— * -*** 



... «.«. UVMtM M uivnuwma. iney both form low trees with 

 short stems, and their broad and densely leafy crowns are forked 

 two or three times. J 



two or three times. 



br fwn 6 W ylla , 1 l 3 " 8 m / tres ( 9 ~ 26 feet > in height with blackish- 

 usuairv7 a ia k r t^ d b f a ? tiful P Qr P le *•*! the leaf lamina is 

 SS ii^i^.^. -e roundish as in 



It 



from 



Jw^X 1 ? 1 ^ ° n the , ri ^ ht bank of *e Rio San Francisco, 



the^erradnL^-K 'l" PeCia J ly in the mountainous districts of 

 tne .erra do Encaibro, Serra do Tombador, Serra do Assurua, etc. 



near h th?v^ b Tr d h inthe i Wildstate0nl y in a restricted area 



where it i3 t^?vf" Cl i ique in the Serra do San J S nazio > 



SometimesTisCnH ° ther treeS among8t the sandstone rocks, 

 metimes it is found in company with Mangabeira. 



Y"V^ f\ ** V* — — * . • • — 



S h J5^ S is closel y allied to M, 



somewhat smaller tree tr 0m 9 T ♦ , HZf** * but f ° r 



differs in having .WrtitT^SL me ? 68 (6 ~ 16 feet > in hei ^ ht > 

 also are longer Cf th f *!?,?! ^.broader tips. The racen 



forms 

 it 



acemes 

 The 



The locality f or this sneH piavnyensis. 



south-east of the State n f I \ ^ from the region to the 

 from about 8°-10° S lat Tt y • g the bou ndary of Bahia 

 mountain ranges, which stret!!?™ 8 X the rather lower sandstone 

 region the trees of ?/ l^t ^ ■ )mud * frora Cea ra. In this 

 distinguished by thei r tnS^ST 9 C ° V / r a wide area and are 

 which they are intermingled green from the >w trees with 



Isolated examples mav 1 

 appear to succeed best on a" sanT"*^ ^ he rocke > and the trees 



Collection of Rubber. 



toX th dfffe^ CCieS rt «« fr°m tt?' i„ C °" eC ' ion ° f th * ">»*« tram 



»ndmedi„™: ; .V erm wed 



-- -». ta -"Ei&s^ss. "-* ~* o, t - ot ^ 



