THE BOTANY OF THE GUAYAXA HIGHLAND PART III 



69 



14-25 cm long, pubescent and/or very finely bullate beneath; buds 

 not seen ; inflorescence, including the fruit, heavily velutinous with 

 pale brownish-yellow or golden-brown hairs 0.5-1 mm long. 

 35. Leaves pubescent and finely bullate beneath, 5-7 cm wide, more 

 than twice as long as wide; marginal vein 1.5-2.5 mm from the 

 margin; petiole 2 cm long; Venezuela (Chimanta). 27. If. intonsa. 



35. Leaves merely pubescent beneath, 7-13 cm wide, usually less than 

 twice as long as wide ; marginal vein 3-6 mm from the margin ; 

 petiole 1 cm long; Colombia (Rio Apaporis). 26. If. insignis. 



34. Lateral veins when dry flat or slightly elevated on the upper surface, 

 the number often indefinite because of the numerous nearly equal 

 intermediate veins ; leaves pubescent or glabrous and smooth be- 

 neath, not bullate; buds and pubescence various. 



36. Pubescence white to gray or yellowish-white ; buds closed, 3.5-5 

 mm long. 



37. Inflorescence canescent or appressed-pubescent with grayish 

 white hairs; leaves broad, 6-9 cm long, 1.3-2.2 times as long as 

 wide, obtuse and emarginate to blunt or rounded at the tip ; 

 calyx calyptrate, with small accessory lobes persistent on the 

 hypanthium; Venezuela (Guayana), at elevations of 1700-2000 

 m. 21. M. cana. 



37. Inflorescence velutinous to hirsute with yellowish-white hairs; 

 leaves 8-13 cm long, 2-3 times as long as wide, narrowly acu- 

 minate; calyx opening irregularly longitudinally into about 4 

 lobes; Amazonian Peru and Brazil (Rio Uaupes). 36. M. spruceana. 



36. Pubescence reddish, reddish-brown, coppery, or brownish-yellow; 

 buds open or closed. 



38. Pubescence relatively sparse, the reddish appressed dibrachiate 

 hairs most abundant on the base of the hypanthium ; flowers 

 closely sessile along the raceme-like branches and often appar- 

 ently immersed in them ; buds 2.5 mm long, calyptrate ; British 

 Guiana. 2. C. apoda. 



38. Pubescence abundant, the buds and inflorescence so densely 

 covered that most of the surface is obscured. 



39. Midvein flat or convex above, the whole sometimes sunken as 

 the result of a troughlike folding of the blade, the vein proper 

 1-1.5 mm Avide at the base; inflorescence velutinous with 

 coarse lustrous antrorsely appressed reddish-brown hairs; 

 buds obovoid, 4-4.5 mm long, appearing closed but actually 

 with a tiny apical aperture with 4-5 dark marginal gland-like 

 teeth; Venezuela (Xeblina). 20. M. caesariata. 



39. Midvein impressed above, the vein proper narrow, appearing 

 as a V-shaped or U-shaped furrow less than 1 mm wide and 

 up to 1 mm deep, the sides of the furrow sometimes folded 

 together so as to obscure the vein ; buds and pubescence 

 various. 



40. Leaves thickly impressed-puncticulate above (the glands 

 more than 50 per square mm) ; buds closed, calyptrate, 3-4 

 mm long: pubescence of silkv apnressed hrownish-vpilow 

 hairs up to 1.5 mm long. Suriname. 1. C. amslioffae. 



40. Leaves sparingly and obscurely or not at all impressed- 

 punctate above; pubescence of reddish-brown or coppery 

 hairs. 



41. Buds closed, calyptrate; petals none; eastern Colombia. 



3. C. canaliculata. 

 41. At least the outer calyx-lobes distinct and separate in the 



bud; petals present; Venezuela (Guayana) to West 



Indies. 



42. Bracts persistent, broadly deltoid-ovate and somewhat 

 inclosing the bases of the subtended branchlets, up to 



