124 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [Vol. 8, No. 2 



Diacidia Griseb. Fl. Bras. 12 1 : 119. 1858. 



Diacidia duckeana is the second species of the genus. It is adequately set 

 off from D. gal phimio ides Griseb. which (from description and photograph of the 

 type) has more strongly pubescent narrower oblong-elliptic leaves with acute or 

 acuminate apices and bases, petioles 2-4 mm. long, cymes 3-flowered, and petals 

 subequal. 



Key to the Species of Diacidia 



1. Leaves oblong-elliptic 2 cm. or less broad, base and apex acute or 



acuminate; petioles 2-4 mm. long; petals subequal. 1. Diacidia galphimioides. 



1. Leaves ovate 3.5-4.5 cm. broad, base obtuse, apex subacute apiculate; 

 petioles ca. 10 mm. long; petals unequal, the fifth twice the length of 

 the smaller. 2. Diacidia duckeana. 



Diacidia duckeana iMaguire, sp. no v. 



Fruticulus 1 m. altus; ramis teretibus cretaceis plus-minus dense subrufo- 

 sericeis; internodiis 4-5 cm. longis; foliis oppositis, laminis submembranaceis 

 ovatis 6-8 cm. longis 3.5-4.5 cm. latis, ca. 8 jugis prominulis nervis, supra 

 subtusque sparsissime strigosis, apice subacuto apiculato, basi obtusa, petiolis 

 ca. 1 cm„ longis sericeis non-connatis, stipulis ad basim ca. 2 mm. connatis, 

 intrapetiolaribus connatis ovatis 3-4 mm. longis subpilosis; foliis inflorescentiam 

 subtendentibus 4 cm. longis 2.5 cm. latis subsessilibus; inflorescentia terminali 

 ca. 15 cm. longa glabra subcretacea paniculata, ramulis ca. 1 cm. longis, cymis 

 5-6 floribus indeterminatis unilateralibus floribus inferioribus caducis, pedun- 

 culis secundis ca. 2 mm. longis, pedicellis gracilibus 6-8 mm. longis, bracteis 

 caducis non visis, biacteolis ovato-orbicularibus concavis 4-5 mm. longis; flori- 

 bus flavidis 1.75 cm. latis, sepalis ovato-lanceolatis obtusis 3-4 mm. longis 

 conspicue biglandularibus evidenter in maturatis non-ampliatis, petalis inae- 

 quilateralibus minote ca. 5 mm. longo, maximo 10-12 mm. longo valde ungulatis, 

 laminis orbicularibus crispo-crenulatis; staminibus 10 subaequilateralibus vel 

 3 anticis brevioribus, filamentis ad basim in annulo piloso-hirsuto 1 mm. con- 

 natis, partibus liberis 1.5-2.0 mm. longis glabris, antheris ad basim introrsis 

 basifixis barbatis ca. 1 mm. longis, apice bicornuto, aristis ca. 0.5 mm. longis in- 

 trorse nectantibus connectivo non-conspicue thesis excedentibus; ovario glabro 

 2-loculare, loculis uniovulatis; stylis 3 glabris subulatis ca. 4 mm. longis; 

 fructibus non visis. 



TYPE: in rupibus graniticus montium Cucuhy, Rio Negro super, fruticulus 1 

 m. [alms], fl. flavis, Amazonas, Brazil, Sept. 22, 1935,^. Ducke 34633; U. S. 

 National Herbarium No. 1740259. 



Sipapoa Maguire, gen. nov. Galphimieae Niedenzu, Byrsoniminae Niedenzu. 



Inflorescentia spicata; sepalis maturis ampliatis; staminibus (5) 6-8, antheris 

 glabris bicornutis; ovario biloculare glabro tristylari, stylis subulatis, loculis 

 uniovulatis; cotyledonibus aequalibus oblongis inflexis lateraliter adpressis. 



Frutex vel arbor parva; petiolis valde connato-vaginatis. Genotypus Sipapoa 

 kunhardtii Maguire. 



Key to the Species of Sipapoa 



1. Inflorescence strongly pubescent. 

 2» Leaves glabrous on upper surface. 

 3. Mature sepals oblong or lanceolate. 



4. Leaves broadly elliptic to suborbicular, glabrous and glaucous 

 beneath except for the sparsely pilose nerves and conspicu- 

 ously ciliate margins; sepals denticulate. 1. Sipapoa kunhardtii. 

 4. Leaves elliptic, membranous, densely sericeous beneath, the 



nerves obscured, margins not ciliate; sepals entire. 2. Sipapoa hypoleuca. 



