42 



MKAIOIRS OF TIIK NKW YORK BOTANICAL (iARDKX 



[vol. 10 



vulato, ovulo subsessili exappendiculato prope basim affixio ; seminibus elliptico- 

 oblongis, conspicue striatis, rapha ventral i plus-minusve conspicua. 



Herbae perennes basibus fibrosis, foliis subequitantibus. 



Typus : Duckea cyperaceoidea (Ducke) Maguire. 



Key to the Species of Ducked 



L. Bracteoles of the spikelets acuminate; inflorescence globose; leaves gramineous. 

 2. Inflorescence less than 2 cm in diameter; bracteoles ascending at maturity, incon 

 spieuously nerved, the apex strongly aristate; petals much shorter than the sepals. 



1. I), cyperaceoidea. 



2. Inflorescence exceeding 2 cm in diameter; bracteoles squarrose at maturity, strong- 



ly 5-7-nerved, the apex merely acuminate; petals more or less equaling the sepals. 



2. I), squamosa. 



1. Bracteoles obtuse or acute. 



3. Inflorescence globose, 1.0-1.4 cm long; bracteoles acute; leaf -blades terete, some- 



what compressed upwards. 3. D. juncifonnis. 



3. Inflorescence oblong, 2-4 cm long; bracteoles obtuse; leaf -blades plane, subsuccu 



lent. 4. J), flava. 



1. Duckea cyperaceoidea (Ducke) Maguire, comb, now . 



C< pltalostcmon cyperaceoides Ducke, Arch. Bot. Jard. Rio de .Janeiro 1: L0. L915. 

 Type: campos do orientum appiduli. Fero, Para, Brazil, May 2o, 1911, 

 .4. Ducke 11702. 



Distribution: Wet sandy soil of savanna and campos, tributaries of the Rios 

 Guainia and Casiquiare, Venezuela, Rio Negro, Amazonas, Brazil, and the Lower 

 basins of the Rios Jamunda, Trombetas, and Tapajoz, Para, Brazil. 



Specimens examined : BRAZIL: Para: Campos do Fero, Ducki 11341 (holojkype US photo 

 NY, isotype RB, F, MG) ; Campos do Ariramba, fl. Trombetas, Dec 4, 1910, Ducke 1134$, im 

 mature (paratopes US photo NY, photo F, S) ; same locality, Nov 30, 1913, Ducke 14885 (para 

 type US, photo F) ; Campina Bello Vista, Rio Tapajoz, Dec 6, 1915, Ducke 15832 (US photo 

 NY, pho'o F); Campina de Perdicto, Rio Tapajoz, Sept 24, 1922, Ducke 12786 (B, 8). Aina 

 zonas: Caatinga, Itaubal, Rio Araca, Rio Negro, Oct 2(5, 1952, Froes 4' Addison 29121 (NY). 

 VENEZUELA: Terr. Amazonas: Flowers yellow, infrequent, savanna margin, Sabana El 

 Venado, Cario Pimiehin at 140 m alt., April 14, 1953, Maguire 4' Wurdaek 35572; occasional, 

 savanna edge, Sabana Venado, 140 m alt,, Nov 23, 1953, Maguire, Wurdaek 4- Bunting 36363; 

 common in open marshy savanna, Sabana Grande, right bank Rio Pacimoni 50 km above 

 mouth, at 110 m alt., Nov 29, 1953, Maguire, Wurdaek cf Bunting 36467 ; Feb 7, 1954, Maguirt , 

 Wurdaek 4- Bunting 37573; 37686; flowers yellow, frequent, Sabana Hechimoni, Cano Hechi- 

 moni, at 120 m alt., Feb 9, 1954, Maguire, Wurdaek # Bunting 37630. 



Duckea cyperaceoidea is most elosely related to D. squarrosa, an affinity 

 already noted by Ducke. 



2. Duckea squarrosa ( Willd. ex Link) Maguire, comb. nov. 



Dichromena squarrosa Willd. Herb. Willd. No. 1153. 



Dichromena squarrosa Link, Jahrb. 3: 77. 1820. 



Rapatea? squarrosa (Link) Kunth, Enum. PI. 3: 367. 1841. 



Cephalostemon squarrosus Kornicke, Linnaea 37: 450. 1874. 



Type: ad fluv. Orinoco, Humboldt s.n. (B, Herb. Willd. 1153). 



Distribution: Inundable or swampy land, Edo. Bolivar and the Upper Ori- 

 noco River, Venezuela, and the Rio Icana, affl. Rio Negro, Amazonas, Brazil. 



Specimens examined: VENEZUELA: Edo. Bolivar: swampy ground, large savanna, vie. 

 Uriman, alt. 300 m, April 30, 1953, Steyermark 75323. Terr. Amazonas: ad fluv. Orinoco, Hum- 

 boldt s.n. (holotype Herb. Willd. 1153, B, photos F, NY, US); spikelet of the type and draw- 

 ings, Her'). Nees (B) ; sabanitas margen del Rio Temi, Yavita, Jan 3d, 1942, Williams 14085 

 (F, US) ; locally occasional, reclining sedge-like herb, floodbanks under palm thicket, Rio Temi, 

 at 130 m aft., Oct 18, 1950, Maguire 20276; Yapacana Savanna No. 1, at 120 in alt., Jan 7, 

 1951, Maguire, Cowan 4" Wurdaek 30799 ; bractlets white, squarrose, flowers bright yellow, Yapa- 



