1953} 



BOTANY OF THE GUAYANA HIGHLAND 



113 



Rio Guainia, Maroa, February 1942, Williams 14341 (US); ''anegadas de las rlos Guainia y 

 Negro, San Carlos, 100 m.," February 1942, Williams 14470 (US); Esmeralda, alto Orinoco, 

 143 m., June 1942, Williams 15458 (US); Ciudad Bolivar on Orinoco, Rio la Pena, Feb.- 

 March 1921, L, H. & E. Z. Bailey (NY); Apure, between Rio Arauca and Cunaviche, Febru- 

 ary 1941, Chardow 248 (US); Ciudad Bolivar, E. Sifontes s, ru (US); small tree along Cuao 

 River, Danta Falls, November 19, 1948, Maguire & Politi 27338 (NY): frequent tree to 40 

 m., La Urbana, March 8, 1949, Maguire & Maguire 29006 (NY); tree, banks of Orinoco River, 

 30 km. below La Urbana, March 14-15, 1949, Maguire & Maguire 29022 (NY); Rio Ventuari, 

 January 10, 1951, Maguire, Cowan & Wurdack 30826. 



COLOMBIA: San Felipe, Comisaria del Vaupes, November 1948, Romero 1199 (US). 



2. Campsiandra angustifolia Spruce ex Benth.; Mart. Fl. Bras. 15(2): 55. 1870. 



Tree 6-25 m. tall, all parts except the upper leaflet surface sparsely to sub- 

 densely appressed-puberulent; leaves 7- 13-foliolate, the petioles 2.5-6 cm. long, 

 narrowly winged, the rachis angled-canaliculate above, 5-16.5 cm. long, the 

 petiolules 1-2 mm. long, transversely rugose; leaflets opposite to subopposite, 

 6-15 cm. long, 2-6.5 cm. wide, lanceolate, lance-elliptic, elliptic, oblance- 

 oblong, or oblong-lanceolate, the base rotund or obtuse, the apex short-acuminate 

 to acuminate, the tin obtuse, above glabrous, below with minute scattered appressed 

 hairlets, the venation finely reticulate, prominulous on both sides; inflorescences 

 terminal, 7-15 cm. long, compound panicles of racemes, the bracteoles lance- 

 olate, glabrous within, the pedicels 1-1.5 cm, long, articulate at the base of the 

 flower; calyx-tube 2-2.5 mm. long, 2-3 mm. in diameter at the apex, the sepals 

 lanceolate or lance-ovate, 1.8-2 mm. long, 1.5-1.8 mm. wide, obtuse; petals plane 

 or with margins somewhat inflexed, oblong, oblong-oval, or oval, 6-3 mm. long, 

 3-4.5 mm. wide, glabrous except for the ciliolate margin; stamens inflexed in the 

 bud, the filaments glabrous, 2-3 cm. long, the anthers oval-oblong, 1.5 mm. long, 

 1 mm. wide, pilose dorsally; pistil glabrous, the stigma expanded-truncate, the 

 style 2-2.5 cm. long, the ovary 4.5-5 mm. long, 1.5 mm. wide, linear-oblong 

 5-ovulate, the stipe 2.5-3 mm. long; fruit falcate, oblong, 21-26 cm. long, 5.5-7 

 cm. wide. 



Specimens Examined: BRAZIL: "Prope ad Rio Uaupes," Spruce 2561 (type no. of C. 

 angustifolia Spruce ex Benth.; NY); Para, State of Para, April 1918, Curran 5(NY): State of 

 Amazonas, municipality Humayta, near Tres Casas, basin of Rio Madeira, September- 

 October 1934, Krukoff 6366 (NY): Amazonas, Maues, November 1946, Pires 166 (NY). 



PERU (Depart. Loreto): Mishuyacu, near Iquitos, 100 m., September 1929, Killip & 

 Smith 29977 (NY); Caballo-Cocha on Amazon River, August 1929, Williams 2345 (US); Man- 

 finfa on upper Rio Nanay, June— July 1929, Williams 1142 (US); Gamitanacocha, Rio Mazan, 

 100-125 m., Schunke 92 (US); Mishuyacu, near Iquitos, 100 m., May-June 1930, Klug 1375 

 (US & NY) and Klug 1196 (US & NY). 



COLOMBIA: Guaracapuri Cachoeira, Rio Vaupes, region east of Mitu, November 1945, 

 Allen 3377 (US); Rio Cuduyari orillas, afluente del Vaupes, 200 m., November 1939, 

 Cuatrecasas 6821 (US). 



This species is distinct from C. comosa principally on its smaller flowers. Of 

 the two varieties of that species it most closely approaches the typical one. 



The distribution of this species is also rather interesting; while most of the 

 collections come from the headwaters of the Amazon region in northwestern 

 Brazil, northeastern Peru, and southeastern Colombia, single collections from 

 southwestern Brazil and Belem represent the outposts of the distributional pat- 

 tern. Future collections from these areas will probably reveal that the species oc- 

 curs throughout the Amazonian and its tributary basins. 



Cassia alata L. 



Shrub or small tree to 8 m., flowers yellow, stems quadrangular, pod 4-winged, 

 Isla Raton, Orinoco River, November 16, 1948, Maguire & Politi 27320. Common in 

 cultivation and as a weed throughout the tropics of the world. 



