MULFORD KXPLORATION OF THE AMAZON VALLEY 



277 



A sin<j,-le specimen, Yrupana, 5,500 feet, G. S. McCarty, Au- 

 gust 6, 1921 {no. 126). 



RUTACEAE 



Zanthoxylum Cardenasii 



(Only fruiting specimens seen.) Glabrous except a slight 

 puberulence on the pedicels and rachis, the branchlets short and 

 stout. Petiole and leal'-racliis slender, together 7 to 12 cm. long. 

 Leaflets mostly 5 to 7, 6 to 10 cm. long, 2.5 to 4 cm. broad, oblong, 

 with a very abrupt, short, obtuse point at the smnmit and con- 

 tracted at the base into a blackish petiolule 5 to 7 cm. long, en- 

 tire, thick, the secondai'ios 12 to 15 on a side, slender, widely 

 spreading, lightly interarcliing near the margin, the midrib stout, 

 terete, strongly prominent beneath, lightly channeled above. 

 Panicles numerous, crowded, short, sessile, densely fruited, the 

 blackish branchlets and pedicels short and thick. Mature car- 

 pels mostly 3, sessile by a narrowed blackish base, brown, shal- 

 lowly pitted, about 5 mm. long and nearly as broad, inequilater- 

 ally obovoid with rounded summit tipped by the short and stout 

 style-base. Seed solitary, ellipsoidal, black, smooth and strongly 

 shining, the breadth two thirds of the length, the testa thick. 



Ixiamas, 800 feet, M. Cardenas, December 17, 1921 {no. 1933). 

 A large shrub, with red fruit, on sunny pampas. 



Zanthoxylum annulatum 



(Fruiting specimens.) Glabrous, the branchlets very stout, 

 terete, gray, finely wrinkled in drying. Petiole and rachis slen- 

 der, terete, ascending, 10 to 18 cm. long, sparsely and finely 

 black-dotted. Leaflets mostly 5 or 7, thin and membranaceous, 

 bright-green, the lower successively smaller. Petiolules 5 to 10 

 mm. long, channeled, finely whitish annulate and wrinkled. 

 Blades 8 to 15 cm. long, 4 to 7 cm. wide, oval, acute or short-acu- 

 minate at the base, rounded and cuspidate at the summit, the 

 venation very slender, lightly prominent beneath, the secon- 

 daries about 12 on a side, Avidely spreading and lightly and ir- 

 regularly anastomosing at some distance from the margin, the 

 reticulation obscure. Panicles lateral, sessile, short and dense, 

 the pedicels short and thick, the 2 or 3 carpels subsessile, com- 

 pressed and lightly keeled, strongly reticulate-pitted, greenish- 

 brown, 6 mm. long, about 3 mm. Avide, obovoid Avith rounded 

 summit. Seed black, someAvhat shining, reticulate-Avrinkled. 



Kurrenabaque, 1,000 feet, H. H. Rushy, October 6, 1921 {no- 

 795). A small tree Avith peculiar and agreeable fragrance. 



