1953] 



REVISION OF MACROL OB IUM 



311 



usually oval, oblong, or elliptic, the apex acute, glabrous within, densely puberu- 

 lous externally, \\ypanthium 1-2.5 mm. long on a stipe to 1.5 mm. long, both usu- 

 ally sparsely and minutely puberulous. Sepals typically four, infrequently five 

 (the adaxial pair incompletely united), (3~)5(-6.5) mm. long, (1.5-)2.5(-4.5) mm. 

 wide, oblong to elliptic, infrequently lanceolate or ovate, usually obtuse, some- 

 times acute to acuminate, more or less minutely puberulous on the costa exter- 

 nally or glabrous. Petal blade (4-)5-6(-7.5) mm. long, (3.5-)5(-8) mm. wide, oval 

 or orbicular, infrequently transversely oval, the claw (3.5~)5(~7.5) mm. long, sub- 

 auriculate to auriculate basally, glabrous externally or pilose sparingly at the 

 base, sparingly to strongly villose within, the claw more or less ciliolate. Fila- 

 ments (14-)20(-24) mm. long, villose in the lower part. Stigma simple or capitel- 

 late. Style ( 12-)20(-25.5) mm. long, pilosulose at the base. Ovary 1-3 mm. long, 

 1-1.5 mm. wide, oval to oblong or ovate, pilosulose on one or both margins, papil- 

 late-puberulous on the lateral surfaces, or papillate-puberulous or puberulous on 

 ail surfaces, (l-)2(-3)-ovulate; gynophore 2-4 mm. long, pilosulose and papillate- 

 puberulous or only papillate-puberulous, inserted at any point between the base 

 and the apex of the hypanthium on the adaxial wall. Fruit 8-14 cm. long, 4-8.5 

 cm. wide, asymmetrically oblong or oval-oblong, broader toward the apex, the ad- 

 axial margin dilated into thick wing-like ridges, densely and minutely papillate, 

 the carpophores 4-17 mm. long, glabrous to sparingly pilosulose or minutely pa- 

 pillate. Seed one per fruit, 3~4.5 cm. long, 2-4 cm. wide, oblong, oval, or orbicu- 

 lar, the testa crustose and more or less reticulate-venose. 

 Type Collection: F. Aublet s.n., "Cayenne" (isotype BM). 



Additional Specimens: BRAZIL: Rio de Janeiro: Cult. Horto Bot. Rio de Janeiro, Feb. 

 1916, Constantino (H.J.B.R. No.) 7621 (RB, U, US); Bot. Gds. Rio de Janeiro, June 1918, 

 Whitford 33 (GH, US, Y). Para: Utinga, Belem, Aug. 1942, Archer 7611 (NY); South Forest 

 of I.A.N. Belem, Nov. 1942, Archer 7885 (F); Belem, coffee plantation of I.A.N., Oct. 1947, 

 Black 831 (IAN); Antonio Lemos, Igarape Pixuna, July 1948, Black 48-2993 (IAN, U); near 

 Oiapoque, Terr. Amapa, Oct. 1949. Black 49-8300 (IAN); Para, Nov. 1829, Burchell 9746 

 (GH, NY); Boa Vista, Rio Tapajoa, Aug. 1932, Capucho 393 (F, IAN); Utinga, Belem, Oct. 

 1940, Ducke 592 (F, IAN, MO, NY, US); forest reserve, Belem, Aug. 1942, Ducke 7611 (F, 

 NY); Santa Izabel, Belem-Braganca, Sept. 1908, Ducke 9675 (G, US); Faro, May 1911, Ducke 

 11696 (G, U); Obidos, campos do Mariapixy, July 1912, Ducke 11953 (G); Garupa, Dec. 1916, 

 Ducke 16691 (G, P, US); Insulis Breves, May 1923, Ducke 16942 (U); Castanhal, Colonia 

 3 de Outubro, Dec. 1949, Froes 24891 (IAN, NY); Rio Oiapoque, Terr. Amapa, Jan. 1950, 

 Froes 25703 (IAN) and Oct. 1950, 26713 (IAN, NY); Belem do Para, Nov. 1902, Goeldi 

 3011 (G); Igarape Mexiana. Sept. 1901, Guedes 2297 (G); Ourem, Rio Guama, Dec. 1899, 

 Huber 1810 (G); Rio Arama, Breves, March 1900, Huber .1891 and 1892 (G); Ilha do Mos- 

 queiro near Para, Nov. 1929, Killip & Smith 30662 (NY, US, W); near Abaete, Aug. 1934, 

 Krukoff 5861a (A, MO, NY, U, US); Ilha Marajo, Nov. 1907, Lutz 9474 (U); Santa Maria, 

 Thome Assa, Dist. Acara, July 1931, Mexia. 5935 (F, GH, MO, NY,JJ, UC, US); Belem, 

 Utinga, Aug. 1945, Pires & Black 98 (IAN); Bussuquara, Utinga, Belem, Nov. 1945, Pires 

 & Black 790 (IAN, NY); Belem, near Euna, Sept. 1942, da Silva 97 (IAN). 



VENEZUELA: Bolivar: Rio Carom', May 1945, Cardona 1139 (US, VEN); Rio Uonan, 

 afluente del Ikabaru, Oct. 1946, Cardona 1707 (NY, US, VEN); Rio Uaiparu, afl. del Ika- 

 baru, 1946, Cardona 1913 (NY); orillas del no Iktebe, Cardona 2161 (VEN); orillas del no 

 Cuyuni, Feb. 1949, Cardona 2790 (NY); Sta. Elena de Uairen, alto Caroni, April 1946, 

 Lasser 1438 (NY); Sta. Elena, Rio Uairen, Gran Sabana, March 1946, Tamayo 3156 (US, 

 VEN). Delta Amacuro: Orinoco Delta, Rio Manimo, March 1911, Bond, Gillin & Brown 215 

 (GH, NY, US). 



BRITISH GUIANA: Kalacoon, Mazaruni R., Oct. 1923, Altson 33 (P); Juanita, Amacura 

 R., NW Dist., July 1908, Anderson 52 (BGF); Kaituma R., NW Dist., Oct. 1908, Anderson 

 52A (BGF); Arawau R., NW Dist., July 1934, Archer 2340 (US); Kartabo Region, Cuyuni 

 R., Aug. 1920, /. W. Bailey 108, 173 (GH); Waini R., NW Dist., Sept. 1921, de la Cruz 

 1126 (GH, NY, US); upper Rupununi R., near Dadanawa, June 1922, de la Cruz 1480 (F, G, 

 GH, MO, NY); between Demerara and Berbice Rivers, July 1922, de la Cruz 1658 (F, GH, 

 MO, NY, UC, US); upper Mazaruni R., Sept.-Oct. 1922, de la Cruz 2247, 2273, 2376 (F, 

 GH, MO, NY, UC, US); Kamakusa, upper Mazaruni R., Nov. 1922, de la Cruz 2826 (F, NY, 

 US); Pomeroon R., Pomeroon Dist., Dec. 1922, de la Cruz 3228 (F, GH, MO, NY, UC, US); 



