1953] 



REVISION OF MACROLOBIUM 



315 



(then sepals four), 1-5.5 mm. long, 1-3 mm. wide, triangular-ovate, lanceolate, or 

 oblong, acute to caudate-acuminate, glabrous or sparingly puberulous on the outer 

 surface on the costa, sparingly ciliolate. Petal blade (3.5")5(-7.5) mm. long, (4-) 

 6(-8.5) mm. wide, usually transversely oval, infrequently suborbicular, the claw 

 (3.5— )5(— 7) mm. long, broader to distinctly auriculate basally, glabrous or pilosu- 

 lose on the base externally and villosulose within up to the center of the blade, 

 ciliolate in the basal half of the claw. Filaments ( 13-)20(-23.5) mm. long, vil- 

 losulose basally. Stigma capitate, peltate-capitate, or infrequently capitellate. 

 Style (12-)17(-22.5) mm. long, pilosulose basally. Ovary 1.5-3 mm. long, 1-2 mm. 

 wide, oval, oblong, elliptic, or ovate, pilosulose on the margins, the lateral sur- 

 faces glabrous, or very rarely laterally pilosulose, 2-ovulate; gynophore 2-4 mm. 

 long, pilosulose, inserted at the top of or midway on the hypanthium wall. Fruit 

 7-11 cm. long, 4-6 cm. wide, usually elliptic or elliptic-obovate, or ovate-elliptic, 

 rarely oblong, glabrous or with a few marginal hairs, the carpophores 7-15 mm. 

 long, sparingly pilosulose. Seeds 3-4 cm. long, 2.5*3.5 cm. wide, oval, the crus- 

 tose testa more or less reticulate-venose. 



Type Collection: R. Spruce 154, "Caripi," near Para, Para, Brazil, Aug. 1849 

 (HOLOTYPE K, isotype NY, P, W). 



Additional Specimens: BRAZIL: Burchell 9315 and 9950 (GH). Para: Sao Miguel do 

 Guama, near Rios Guama and Irituia, Aug. 1948, Dardano & Black 48-3166 (IAN); Faro Ma- 

 cujubim, Sept. 1901, Ducke 2230 (U); Rio Mapuera, Dec. 1907, Ducke 8972 (G); Rio Ya- 

 munda, May 1911, Ducke 11722 (G); Rio Tapajoz, Maria Luisa, July 1923, Ducke 16940 

 (U); Furos de Breves, Sept. 1901, Guedes 2230 (G, US); Rio Capim, June 1897, Huber 773 

 (G, US) and 788 (G); Arama, Breves, March 1900, Huber 1893 (G); Belem do Para, June 

 1901, Huber (H.J.B.R. No.) 10912 (HAMP No. 2081) (RB); Ilha do Mosqueiro, near Para, 

 Nov. 1929, Killip & Smith 30480 (NY, US); Belem do Para, Nov*. 1902, Sigueira 3004 (G); 

 Igarape Una, June 1923, Snethlage 98 (F, GH, US); in vicinibus Para, July-Aug. 1849, 

 Spruce s-.n. (G) (this may be an isotype). Matto Grosso: Rio Pacca Nova, affl. Rio Ma- 

 more, Sept. 1923, Kuhlmann 17666 (U). Amazonas: Upper Rio Negro, Ilha Nova Vida, Feb. 

 1944, Baldwin 3438 (US); Rio Urubu between Lindaya and Iracema, Sept. 1941, Ducke 802 

 (F, IAN, MO, NY, US); Bas Yapura, Sept. 1904, Ducke 6799 (G); Rio Negro, Cucuhy, Iga- 

 rape Macacuny, Sept. 1935, Ducke 35192 (US); Rio Paduiri, Igarape Castanha, Oct. 1947, 

 Froes 22519 (NY); Rio Solimoes, Igarape Belem, Dec. 1948, Froes 23727 (IAN); Rio Ta- 

 ruma, Manaos, Aug. 1949, Froes 24980 (IAN); Rio Ipixuna, Municip. Humayta between 

 Monte Christo and Santa Victoria, Nov. 1934, Krukoff 7235 (A, F, MO, NY, U, US); Rio 

 Negro, Sept. 1828, Riedel 1443 (A, BM, NY, US); middle Rio Negro, Vista Allegre, be- 

 tween mouth of Rio Curicuriary and Barcellos, Sept.— Oct. 1947, Schultes & Lopez 8866 

 (US); upper Rio Negro, base of Cerro Dimiti, Rio Dimiti, May 1948, Schultes & Lopez 9922 

 (US); prope Panure ad "Rio Uaupes," Oct. 1852, Spruce 2530 (G, GH, K, P, W) (TYPE 

 COLLECTION of M. chry sostachyum var. parviflorum Benth.). 



PERU: Loreto: Gamitanacocha, Rio Mazan, Jan.-Feb. 1935, Schunke 85, 329 (F, UC, 

 US); upper R*o Amazonas, Iquitos, 1924, Tessmann 3658 (F, G, NY). 



COLOMBIA: Capeceras del Cuduyari, Vaupes, Dec. 1943, Allen 3216 (US). 



VENEZUELA: Amazonas: Rio Cunucunuma, above Playa Alta, Nov. 1950, Maguire, 

 Cowan & Wurdack 29495 (F, G, NY), 29501 (NY, US, VEN); Rio Cuao, tributary Rio Si- 

 papo, Jan. 1949, Maguire & Politi 28151 (K, NY), 28414 (F, G, K, MO, NY, US, VEN); 

 prope San Carlos del Rio Negro, March-April, 1853, Spruce 2330 (NY); Maroa, Rio Guainia, 

 Feb. 1942, Williams 14403 (F, NY, US, VEN), March 1942, 14805 (F, NY, US, VEN). Boli- 

 var: Rio Tonoro, alto Ri'o Paragua, Aug. 1943, Cordona 813 and 825 (NY, US, VEN); Rio 

 Caura, Salto de Para, March 1939, Williams 11445 (UC, US, VEN) (TYPE COLLECTION 

 of M. hymenaefolium Pittier). 



BRITISH GUIANA: Upper Rupununi R., near Dadanawa, July 1922, de la Cruz 1799 (F, 

 GH, MO, NY, UC, US); Malali, Demerara R., Oct.-Nov. 1922, de la Cruz 2643 (F, GH, MO, 

 NY, US); Kamakusa on upper Mazaruni R., Nov. 1922, de la Cruz 2826a (GH); Kurupung, 

 upper Mazaruni R., Nov. 1922, Leng 206 (NY); Kurupung, Tacoba, Nov. 1922, Lang & Per- 

 saud 206 (F); Bootooba, June 1924, Persaud 34 (F, NY, UC); Bootooba, Demerara R., 

 March 1923, Persaud 36 (F); Basin of Essequibo R., near mouth of Onoro Creek, Dec. 

 1937, A. C. Smith 2698 (A, F, G, MO, NY, U, US, Y). 



SURINAM: Para R., Oct. 1909, Boldingh 3832 (U); La Prospertu, Focke 986 (GH, U) 

 (TYPE COLLECTION of Vouapa chrysostachya Miq.); fluv. Nickerie, Fulleken 410 (U); 



