MULFORD EXPLORATION OF THE AMAZON VALLEY 



225 



Piper rectispicum Trclease 



A slimb ( ?), nodose, glabi'oiis, ll()\v('i-iii,<;- iiiteniodos slender 

 and rather short ; leaves elliptic, acuminate, acute and sometimes 

 oblique at base, moderate (6X15 cm.), pinnately nerved from 

 below the middle, the nerves about 4X2, drying rather thin- 

 papery and somewhat glossy beneath; petiole 5 mm. long, 

 scarcely winged ; spikes opposite the leaves, straight, 3 X HO 

 mm., nmcronate ; p(>duncle 5-10 mm. long ; bracts round- or tri- 

 angular-snbpeltate with narrow pale ciliate border ; flowers ses- 

 sile, perfect; berries subcubic; stigmas 3, minute, sessile. 



Bopi River Valley, at 3,000 feet, H. II. Rushy, 1921 {no. 574). 



Piper rogaguanum Trelease 



A shrub (?), scarcely nodose, glabrous, flowering internodes 

 slender and elongated; leaves elliptic, gradually acute or sub- 

 acmninate; cordulate, moderate (6X12 cm.), ijinnately nerved 

 from below abont the middle, the nerves 5 or 6 X 2, drying dnll 

 green, somewhat obscurely granular beneath; petiole about 15 

 mm. long, winged near the base ; inflorescence unknown. 



Pampas near Lake Rogagua, H. H. Ilushy, 1921 {no. 1689). 



Piper rurrenbaqueanum Trelease 



A shrub { I), nodose, glabrous, flowering internodes rather 

 thick and short; graniilar-punctulate ; leaves oblong-elliptic, 

 abruptly short-acuminate, obliquely acute at base, moderate 

 (5 X 14 cm.), pinnately nerved from below the upper third, the 

 looping nerves 4—6 X 2 with some intermediates, chartaceous, 

 slightly glossy above, dark-granular beneath ; petiole 10-15 mm. 

 long, scarcely winged; spikes opposite the leaves, as yet young 

 and small (2 X 20 mm.), mucronate; peduncle as yet only 5 mm. 

 long ; bracts rhombic-subpeltate, the large umbo with very nar- 

 row paler margin ; flowers sessile, perfect. 



Rurrenbaque, at 1,000 feet, H. H. Rushij, 1921 {no. 836). 



Piper svidaefolium Trelease 



A shrub ( ?), scarcely nodose, flowering internodes slender and 

 elongated, green, at first almost canescently crisp-velvety; leaves 

 elliptic- or round-ovate, blunt-subacuminate, rounded at base, 

 5-6 X 10-12 cm., pinnately nerved from the lower third or half, 

 the nerves about 4X2, minutely subscabrid above, the ap- 



