MULFORD EXPLORATION OF THE AMAZON VALLEY 



381 



On the pampas near Lake Rogagua, 1,000 feet, H. H. Rushy, 

 October, 1921 {no. 1723 A). 



Borreria (?) nectarifera 



Leaves, etc., scabrous, the internodes nearly glabrous. Stems 

 occasionally nearly a meter high, slender, simple or little 

 branched, the branches erect. Internodes mostly longer than 

 their leaves, quadrangular, the angles slightly winged. Stipular 

 setae tiliform, rigid, unequal, those nearest the leaves reaching 

 8 mm. in length. Leaves sessile, to 3 cm. long, linear-lanceolate, 

 acuminate at both ends, obtusish, entire, margin strongly revo- 

 lute, thick and rigid, the midrib very stout and prominent be- 

 neath. Cymes verticillate, very dense and many-flowered. 

 Calyx-tube narrowly turbinate, the limb 4-parted, with several 

 small intermediate teeth, lobes somewhat unequal, to 2 mm. long 

 and a little longer than the tube, in fruit, lance-linear or subu- 

 late, rigid, whitish with a broad green midrib, obtusish. Corolla «. 

 3 nun. long, 4-parted nearly to the base, the lobes oblong, obtuse, 

 white, bearing a brown gland in the center, above the middle. 

 Anthers nearly sessile, in the sinuses, oblong, nearly 1 mm. long, 

 oblong. One of the mericarps tardily dehiscent on the inner 

 face. 



On the pampas near Lake Rogagua, 1,000 feet, H. H. Rushy, 

 November 4, 1921 {no. 16')9). "Growing in water." 



It would appear that a plant with a petaloid appendage of 

 this kind should be generically distinct from Borreria, but all its 

 other characters are in such close agreement with this genus that 

 I scarcely feel disposed to separate it. 



Mitracarpum simplex 



Sparsely pubescent with short, white, mostly divergent hairs, 

 the leaves somewhat strigose. Stems slender, obscurely quad- 

 rangular, more so above than below. Leaves sessile, 2 to 3.5 

 cm. long, 5 to 10 mm. wnde, oblanceolate, acute or acutish, thin, 

 light-green, the midrib and secondaries slender, the latter about 

 3 on each side, suberect. Cymes small, dense. Bracts coherent, 

 about 3 mm. long, lacerate, the teeth acuminate and very acute. 

 Bractlets setose, slender, acute, unequal, the largest to 3 mm. 

 long. FloW'Crs not dissected. Fruits shortly pedicelled, circum- 

 scissile at the middle or slightly lower, the calyx-tube short and 

 broad, about as long as the teeth, w^hich are very unequal, subu- 

 late, acuminate and acute, rigid, dark-green. 



